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TTTAttributedLabel.m
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TTTAttributedLabel.m
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// TTTAttributedLabel.m
//
// Copyright (c) 2011 Mattt Thompson (http://mattt.me)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#import "TTTAttributedLabel.h"
#import <QuartzCore/QuartzCore.h>
#import <Availability.h>
#import <objc/runtime.h>
#define kTTTLineBreakWordWrapTextWidthScalingFactor (M_PI / M_E)
static CGFloat const TTTFLOAT_MAX = 100000;
NSString * const kTTTStrikeOutAttributeName = @"TTTStrikeOutAttribute";
NSString * const kTTTBackgroundFillColorAttributeName = @"TTTBackgroundFillColor";
NSString * const kTTTBackgroundFillPaddingAttributeName = @"TTTBackgroundFillPadding";
NSString * const kTTTBackgroundStrokeColorAttributeName = @"TTTBackgroundStrokeColor";
NSString * const kTTTBackgroundLineWidthAttributeName = @"TTTBackgroundLineWidth";
NSString * const kTTTBackgroundCornerRadiusAttributeName = @"TTTBackgroundCornerRadius";
const NSTextAlignment TTTTextAlignmentLeft = NSTextAlignmentLeft;
const NSTextAlignment TTTTextAlignmentCenter = NSTextAlignmentCenter;
const NSTextAlignment TTTTextAlignmentRight = NSTextAlignmentRight;
const NSTextAlignment TTTTextAlignmentJustified = NSTextAlignmentJustified;
const NSTextAlignment TTTTextAlignmentNatural = NSTextAlignmentNatural;
const NSLineBreakMode TTTLineBreakByWordWrapping = NSLineBreakByWordWrapping;
const NSLineBreakMode TTTLineBreakByCharWrapping = NSLineBreakByCharWrapping;
const NSLineBreakMode TTTLineBreakByClipping = NSLineBreakByClipping;
const NSLineBreakMode TTTLineBreakByTruncatingHead = NSLineBreakByTruncatingHead;
const NSLineBreakMode TTTLineBreakByTruncatingMiddle = NSLineBreakByTruncatingMiddle;
const NSLineBreakMode TTTLineBreakByTruncatingTail = NSLineBreakByTruncatingTail;
typedef NSTextAlignment TTTTextAlignment;
typedef NSLineBreakMode TTTLineBreakMode;
static inline CGFLOAT_TYPE CGFloat_ceil(CGFLOAT_TYPE cgfloat) {
#if CGFLOAT_IS_DOUBLE
return ceil(cgfloat);
#else
return ceilf(cgfloat);
#endif
}
static inline CGFLOAT_TYPE CGFloat_floor(CGFLOAT_TYPE cgfloat) {
#if CGFLOAT_IS_DOUBLE
return floor(cgfloat);
#else
return floorf(cgfloat);
#endif
}
static inline CGFLOAT_TYPE CGFloat_round(CGFLOAT_TYPE cgfloat) {
#if CGFLOAT_IS_DOUBLE
return round(cgfloat);
#else
return roundf(cgfloat);
#endif
}
static inline CGFLOAT_TYPE CGFloat_sqrt(CGFLOAT_TYPE cgfloat) {
#if CGFLOAT_IS_DOUBLE
return sqrt(cgfloat);
#else
return sqrtf(cgfloat);
#endif
}
static inline CGFloat TTTFlushFactorForTextAlignment(NSTextAlignment textAlignment) {
switch (textAlignment) {
case TTTTextAlignmentCenter:
return 0.5f;
case TTTTextAlignmentRight:
return 1.0f;
case TTTTextAlignmentLeft:
default:
return 0.0f;
}
}
static inline NSDictionary * NSAttributedStringAttributesFromLabel(TTTAttributedLabel *label) {
NSMutableDictionary *mutableAttributes = [NSMutableDictionary dictionary];
[mutableAttributes setObject:label.font forKey:(NSString *)kCTFontAttributeName];
[mutableAttributes setObject:label.textColor forKey:(NSString *)kCTForegroundColorAttributeName];
[mutableAttributes setObject:@(label.kern) forKey:(NSString *)kCTKernAttributeName];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.alignment = label.textAlignment;
paragraphStyle.lineSpacing = label.lineSpacing;
paragraphStyle.minimumLineHeight = label.minimumLineHeight > 0 ? label.minimumLineHeight : label.font.lineHeight * label.lineHeightMultiple;
paragraphStyle.maximumLineHeight = label.maximumLineHeight > 0 ? label.maximumLineHeight : label.font.lineHeight * label.lineHeightMultiple;
paragraphStyle.lineHeightMultiple = label.lineHeightMultiple;
paragraphStyle.firstLineHeadIndent = label.firstLineIndent;
if (label.numberOfLines == 1) {
paragraphStyle.lineBreakMode = label.lineBreakMode;
} else {
paragraphStyle.lineBreakMode = NSLineBreakByWordWrapping;
}
[mutableAttributes setObject:paragraphStyle forKey:(NSString *)kCTParagraphStyleAttributeName];
return [NSDictionary dictionaryWithDictionary:mutableAttributes];
}
static inline CGColorRef CGColorRefFromColor(id color);
static inline NSDictionary * convertNSAttributedStringAttributesToCTAttributes(NSDictionary *attributes);
static inline NSAttributedString * NSAttributedStringByScalingFontSize(NSAttributedString *attributedString, CGFloat scale) {
NSMutableAttributedString *mutableAttributedString = [attributedString mutableCopy];
[mutableAttributedString enumerateAttribute:(NSString *)kCTFontAttributeName inRange:NSMakeRange(0, [mutableAttributedString length]) options:0 usingBlock:^(id value, NSRange range, BOOL * __unused stop) {
UIFont *font = (UIFont *)value;
if (font) {
NSString *fontName;
CGFloat pointSize;
if ([font isKindOfClass:[UIFont class]]) {
fontName = font.fontName;
pointSize = font.pointSize;
} else {
fontName = (NSString *)CFBridgingRelease(CTFontCopyName((__bridge CTFontRef)font, kCTFontPostScriptNameKey));
pointSize = CTFontGetSize((__bridge CTFontRef)font);
}
[mutableAttributedString removeAttribute:(NSString *)kCTFontAttributeName range:range];
CTFontRef fontRef = CTFontCreateWithName((__bridge CFStringRef)fontName, CGFloat_floor(pointSize * scale), NULL);
[mutableAttributedString addAttribute:(NSString *)kCTFontAttributeName value:(__bridge id)fontRef range:range];
CFRelease(fontRef);
}
}];
return mutableAttributedString;
}
static inline NSAttributedString * NSAttributedStringBySettingColorFromContext(NSAttributedString *attributedString, UIColor *color) {
if (!color) {
return attributedString;
}
NSMutableAttributedString *mutableAttributedString = [attributedString mutableCopy];
[mutableAttributedString enumerateAttribute:(NSString *)kCTForegroundColorFromContextAttributeName inRange:NSMakeRange(0, [mutableAttributedString length]) options:0 usingBlock:^(id value, NSRange range, __unused BOOL *stop) {
BOOL usesColorFromContext = (BOOL)value;
if (usesColorFromContext) {
[mutableAttributedString setAttributes:[NSDictionary dictionaryWithObject:color forKey:(NSString *)kCTForegroundColorAttributeName] range:range];
[mutableAttributedString removeAttribute:(NSString *)kCTForegroundColorFromContextAttributeName range:range];
}
}];
return mutableAttributedString;
}
static inline CGSize CTFramesetterSuggestFrameSizeForAttributedStringWithConstraints(CTFramesetterRef framesetter, NSAttributedString *attributedString, CGSize size, NSUInteger numberOfLines) {
CFRange rangeToSize = CFRangeMake(0, (CFIndex)[attributedString length]);
CGSize constraints = CGSizeMake(size.width, TTTFLOAT_MAX);
if (numberOfLines == 1) {
// If there is one line, the size that fits is the full width of the line
constraints = CGSizeMake(TTTFLOAT_MAX, TTTFLOAT_MAX);
} else if (numberOfLines > 0) {
// If the line count of the label more than 1, limit the range to size to the number of lines that have been set
CGMutablePathRef path = CGPathCreateMutable();
CGPathAddRect(path, NULL, CGRectMake(0.0f, 0.0f, constraints.width, TTTFLOAT_MAX));
CTFrameRef frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, 0), path, NULL);
CFArrayRef lines = CTFrameGetLines(frame);
if (CFArrayGetCount(lines) > 0) {
NSInteger lastVisibleLineIndex = MIN((CFIndex)numberOfLines, CFArrayGetCount(lines)) - 1;
CTLineRef lastVisibleLine = CFArrayGetValueAtIndex(lines, lastVisibleLineIndex);
CFRange rangeToLayout = CTLineGetStringRange(lastVisibleLine);
rangeToSize = CFRangeMake(0, rangeToLayout.location + rangeToLayout.length);
}
CFRelease(frame);
CGPathRelease(path);
}
CGSize suggestedSize = CTFramesetterSuggestFrameSizeWithConstraints(framesetter, rangeToSize, NULL, constraints, NULL);
return CGSizeMake(CGFloat_ceil(suggestedSize.width), CGFloat_ceil(suggestedSize.height));
}
@interface TTTAccessibilityElement : UIAccessibilityElement
@property (nonatomic, weak) UIView *superview;
@property (nonatomic, assign) CGRect boundingRect;
@end
@implementation TTTAccessibilityElement
- (CGRect)accessibilityFrame {
return UIAccessibilityConvertFrameToScreenCoordinates(self.boundingRect, self.superview);
}
@end
@interface TTTAttributedLabel ()
@property (readwrite, nonatomic, copy) NSAttributedString *inactiveAttributedText;
@property (readwrite, nonatomic, copy) NSAttributedString *renderedAttributedText;
@property (readwrite, atomic, strong) NSDataDetector *dataDetector;
@property (readwrite, nonatomic, strong) NSArray *linkModels;
@property (readwrite, nonatomic, strong) TTTAttributedLabelLink *activeLink;
@property (readwrite, nonatomic, strong) NSArray *accessibilityElements;
- (void) longPressGestureDidFire:(UILongPressGestureRecognizer *)sender;
@end
@implementation TTTAttributedLabel {
@private
BOOL _needsFramesetter;
CTFramesetterRef _framesetter;
CTFramesetterRef _highlightFramesetter;
}
@dynamic text;
@synthesize attributedText = _attributedText;
#ifndef kCFCoreFoundationVersionNumber_iOS_7_0
#define kCFCoreFoundationVersionNumber_iOS_7_0 847.2
#endif
+ (void)load {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
if (kCFCoreFoundationVersionNumber < kCFCoreFoundationVersionNumber_iOS_7_0) {
Class class = [self class];
Class superclass = class_getSuperclass(class);
NSArray *strings = @[
NSStringFromSelector(@selector(isAccessibilityElement)),
NSStringFromSelector(@selector(accessibilityElementCount)),
NSStringFromSelector(@selector(accessibilityElementAtIndex:)),
NSStringFromSelector(@selector(indexOfAccessibilityElement:)),
];
for (NSString *string in strings) {
SEL selector = NSSelectorFromString(string);
IMP superImplementation = class_getMethodImplementation(superclass, selector);
Method method = class_getInstanceMethod(class, selector);
const char *types = method_getTypeEncoding(method);
class_replaceMethod(class, selector, superImplementation, types);
}
}
});
}
- (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (!self) {
return nil;
}
[self commonInit];
return self;
}
- (void)commonInit {
self.userInteractionEnabled = YES;
#if !TARGET_OS_TV
self.multipleTouchEnabled = NO;
#endif
self.textInsets = UIEdgeInsetsZero;
self.lineHeightMultiple = 1.0f;
self.linkModels = [NSArray array];
self.linkBackgroundEdgeInset = UIEdgeInsetsMake(0.0f, -1.0f, 0.0f, -1.0f);
NSMutableDictionary *mutableLinkAttributes = [NSMutableDictionary dictionary];
[mutableLinkAttributes setObject:[NSNumber numberWithBool:YES] forKey:(NSString *)kCTUnderlineStyleAttributeName];
NSMutableDictionary *mutableActiveLinkAttributes = [NSMutableDictionary dictionary];
[mutableActiveLinkAttributes setObject:[NSNumber numberWithBool:NO] forKey:(NSString *)kCTUnderlineStyleAttributeName];
NSMutableDictionary *mutableInactiveLinkAttributes = [NSMutableDictionary dictionary];
[mutableInactiveLinkAttributes setObject:[NSNumber numberWithBool:NO] forKey:(NSString *)kCTUnderlineStyleAttributeName];
if ([NSMutableParagraphStyle class]) {
[mutableLinkAttributes setObject:[UIColor blueColor] forKey:(NSString *)kCTForegroundColorAttributeName];
[mutableActiveLinkAttributes setObject:[UIColor redColor] forKey:(NSString *)kCTForegroundColorAttributeName];
[mutableInactiveLinkAttributes setObject:[UIColor grayColor] forKey:(NSString *)kCTForegroundColorAttributeName];
} else {
[mutableLinkAttributes setObject:(__bridge id)[[UIColor blueColor] CGColor] forKey:(NSString *)kCTForegroundColorAttributeName];
[mutableActiveLinkAttributes setObject:(__bridge id)[[UIColor redColor] CGColor] forKey:(NSString *)kCTForegroundColorAttributeName];
[mutableInactiveLinkAttributes setObject:(__bridge id)[[UIColor grayColor] CGColor] forKey:(NSString *)kCTForegroundColorAttributeName];
}
self.linkAttributes = [NSDictionary dictionaryWithDictionary:mutableLinkAttributes];
self.activeLinkAttributes = [NSDictionary dictionaryWithDictionary:mutableActiveLinkAttributes];
self.inactiveLinkAttributes = [NSDictionary dictionaryWithDictionary:mutableInactiveLinkAttributes];
_extendsLinkTouchArea = NO;
_longPressGestureRecognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self
action:@selector(longPressGestureDidFire:)];
self.longPressGestureRecognizer.delegate = self;
[self addGestureRecognizer:self.longPressGestureRecognizer];
}
- (void)dealloc {
if (_framesetter) {
CFRelease(_framesetter);
}
if (_highlightFramesetter) {
CFRelease(_highlightFramesetter);
}
if (_longPressGestureRecognizer) {
[self removeGestureRecognizer:_longPressGestureRecognizer];
}
}
#pragma mark -
+ (CGSize)sizeThatFitsAttributedString:(NSAttributedString *)attributedString
withConstraints:(CGSize)size
limitedToNumberOfLines:(NSUInteger)numberOfLines
{
if (!attributedString || attributedString.length == 0) {
return CGSizeZero;
}
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((__bridge CFAttributedStringRef)attributedString);
CGSize calculatedSize = CTFramesetterSuggestFrameSizeForAttributedStringWithConstraints(framesetter, attributedString, size, numberOfLines);
CFRelease(framesetter);
return calculatedSize;
}
#pragma mark -
- (void)setAttributedText:(NSAttributedString *)text {
if ([text isEqualToAttributedString:_attributedText]) {
return;
}
_attributedText = [text copy];
[self setNeedsFramesetter];
[self setNeedsDisplay];
if ([self respondsToSelector:@selector(invalidateIntrinsicContentSize)]) {
[self invalidateIntrinsicContentSize];
}
[super setText:[self.attributedText string]];
}
- (NSAttributedString *)renderedAttributedText {
if (!_renderedAttributedText) {
NSMutableAttributedString *fullString = [[NSMutableAttributedString alloc] initWithAttributedString:self.attributedText];
if (self.attributedTruncationToken) {
[fullString appendAttributedString:self.attributedTruncationToken];
}
NSAttributedString *string = [[NSAttributedString alloc] initWithAttributedString:fullString];
self.renderedAttributedText = NSAttributedStringBySettingColorFromContext(string, self.textColor);
}
return _renderedAttributedText;
}
- (NSArray *) links {
return [_linkModels valueForKey:@"result"];
}
- (void)setLinkModels:(NSArray *)linkModels {
_linkModels = linkModels;
self.accessibilityElements = nil;
}
- (void)setNeedsFramesetter {
// Reset the rendered attributed text so it has a chance to regenerate
self.renderedAttributedText = nil;
_needsFramesetter = YES;
}
- (CTFramesetterRef)framesetter {
if (_needsFramesetter) {
@synchronized(self) {
CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((__bridge CFAttributedStringRef)self.renderedAttributedText);
[self setFramesetter:framesetter];
[self setHighlightFramesetter:nil];
_needsFramesetter = NO;
if (framesetter) {
CFRelease(framesetter);
}
}
}
return _framesetter;
}
- (void)setFramesetter:(CTFramesetterRef)framesetter {
if (framesetter) {
CFRetain(framesetter);
}
if (_framesetter) {
CFRelease(_framesetter);
}
_framesetter = framesetter;
}
- (CTFramesetterRef)highlightFramesetter {
return _highlightFramesetter;
}
- (void)setHighlightFramesetter:(CTFramesetterRef)highlightFramesetter {
if (highlightFramesetter) {
CFRetain(highlightFramesetter);
}
if (_highlightFramesetter) {
CFRelease(_highlightFramesetter);
}
_highlightFramesetter = highlightFramesetter;
}
#pragma mark -
- (void)setEnabledTextCheckingTypes:(NSTextCheckingTypes)enabledTextCheckingTypes {
if (self.enabledTextCheckingTypes == enabledTextCheckingTypes) {
return;
}
_enabledTextCheckingTypes = enabledTextCheckingTypes;
// one detector instance per type (combination), fast reuse e.g. in cells
static NSMutableDictionary *dataDetectorsByType = nil;
if (!dataDetectorsByType) {
dataDetectorsByType = [NSMutableDictionary dictionary];
}
if (enabledTextCheckingTypes) {
if (![dataDetectorsByType objectForKey:@(enabledTextCheckingTypes)]) {
NSDataDetector *detector = [NSDataDetector dataDetectorWithTypes:enabledTextCheckingTypes
error:nil];
if (detector) {
[dataDetectorsByType setObject:detector forKey:@(enabledTextCheckingTypes)];
}
}
self.dataDetector = [dataDetectorsByType objectForKey:@(enabledTextCheckingTypes)];
} else {
self.dataDetector = nil;
}
}
- (void)addLink:(TTTAttributedLabelLink *)link {
[self addLinks:@[link]];
}
- (void)addLinks:(NSArray *)links {
NSMutableArray *mutableLinkModels = [NSMutableArray arrayWithArray:self.linkModels];
NSMutableAttributedString *mutableAttributedString = [self.attributedText mutableCopy];
for (TTTAttributedLabelLink *link in links) {
if (link.attributes) {
[mutableAttributedString addAttributes:link.attributes range:link.result.range];
}
}
self.attributedText = mutableAttributedString;
[self setNeedsDisplay];
[mutableLinkModels addObjectsFromArray:links];
self.linkModels = [NSArray arrayWithArray:mutableLinkModels];
}
- (TTTAttributedLabelLink *)addLinkWithTextCheckingResult:(NSTextCheckingResult *)result
attributes:(NSDictionary *)attributes
{
return [self addLinksWithTextCheckingResults:@[result] attributes:attributes].firstObject;
}
- (NSArray *)addLinksWithTextCheckingResults:(NSArray *)results
attributes:(NSDictionary *)attributes
{
NSMutableArray *links = [NSMutableArray array];
for (NSTextCheckingResult *result in results) {
NSDictionary *activeAttributes = attributes ? self.activeLinkAttributes : nil;
NSDictionary *inactiveAttributes = attributes ? self.inactiveLinkAttributes : nil;
TTTAttributedLabelLink *link = [[TTTAttributedLabelLink alloc] initWithAttributes:attributes
activeAttributes:activeAttributes
inactiveAttributes:inactiveAttributes
textCheckingResult:result];
[links addObject:link];
}
[self addLinks:links];
return links;
}
- (TTTAttributedLabelLink *)addLinkWithTextCheckingResult:(NSTextCheckingResult *)result {
return [self addLinkWithTextCheckingResult:result attributes:self.linkAttributes];
}
- (TTTAttributedLabelLink *)addLinkToURL:(NSURL *)url
withRange:(NSRange)range
{
return [self addLinkWithTextCheckingResult:[NSTextCheckingResult linkCheckingResultWithRange:range URL:url]];
}
- (TTTAttributedLabelLink *)addLinkToAddress:(NSDictionary *)addressComponents
withRange:(NSRange)range
{
return [self addLinkWithTextCheckingResult:[NSTextCheckingResult addressCheckingResultWithRange:range components:addressComponents]];
}
- (TTTAttributedLabelLink *)addLinkToPhoneNumber:(NSString *)phoneNumber
withRange:(NSRange)range
{
return [self addLinkWithTextCheckingResult:[NSTextCheckingResult phoneNumberCheckingResultWithRange:range phoneNumber:phoneNumber]];
}
- (TTTAttributedLabelLink *)addLinkToDate:(NSDate *)date
withRange:(NSRange)range
{
return [self addLinkWithTextCheckingResult:[NSTextCheckingResult dateCheckingResultWithRange:range date:date]];
}
- (TTTAttributedLabelLink *)addLinkToDate:(NSDate *)date
timeZone:(NSTimeZone *)timeZone
duration:(NSTimeInterval)duration
withRange:(NSRange)range
{
return [self addLinkWithTextCheckingResult:[NSTextCheckingResult dateCheckingResultWithRange:range date:date timeZone:timeZone duration:duration]];
}
- (TTTAttributedLabelLink *)addLinkToTransitInformation:(NSDictionary *)components
withRange:(NSRange)range
{
return [self addLinkWithTextCheckingResult:[NSTextCheckingResult transitInformationCheckingResultWithRange:range components:components]];
}
#pragma mark -
- (BOOL)containslinkAtPoint:(CGPoint)point {
return [self linkAtPoint:point] != nil;
}
- (TTTAttributedLabelLink *)linkAtPoint:(CGPoint)point {
// Stop quickly if none of the points to be tested are in the bounds.
if (!CGRectContainsPoint(CGRectInset(self.bounds, -15.f, -15.f), point) || self.links.count == 0) {
return nil;
}
TTTAttributedLabelLink *result = [self linkAtCharacterIndex:[self characterIndexAtPoint:point]];
if (!result && self.extendsLinkTouchArea) {
result = [self linkAtRadius:2.5f aroundPoint:point]
?: [self linkAtRadius:5.f aroundPoint:point]
?: [self linkAtRadius:7.5f aroundPoint:point]
?: [self linkAtRadius:12.5f aroundPoint:point]
?: [self linkAtRadius:15.f aroundPoint:point];
}
return result;
}
- (TTTAttributedLabelLink *)linkAtRadius:(const CGFloat)radius aroundPoint:(CGPoint)point {
const CGFloat diagonal = CGFloat_sqrt(2 * radius * radius);
const CGPoint deltas[] = {
CGPointMake(0, -radius), CGPointMake(0, radius), // Above and below
CGPointMake(-radius, 0), CGPointMake(radius, 0), // Beside
CGPointMake(-diagonal, -diagonal), CGPointMake(-diagonal, diagonal),
CGPointMake(diagonal, diagonal), CGPointMake(diagonal, -diagonal) // Diagonal
};
const size_t count = sizeof(deltas) / sizeof(CGPoint);
TTTAttributedLabelLink *link = nil;
for (NSUInteger i = 0; i < count && link.result == nil; i ++) {
CGPoint currentPoint = CGPointMake(point.x + deltas[i].x, point.y + deltas[i].y);
link = [self linkAtCharacterIndex:[self characterIndexAtPoint:currentPoint]];
}
return link;
}
- (TTTAttributedLabelLink *)linkAtCharacterIndex:(CFIndex)idx {
// Do not enumerate if the index is outside of the bounds of the text.
if (!NSLocationInRange((NSUInteger)idx, NSMakeRange(0, self.attributedText.length))) {
return nil;
}
NSEnumerator *enumerator = [self.linkModels reverseObjectEnumerator];
TTTAttributedLabelLink *link = nil;
while ((link = [enumerator nextObject])) {
if (NSLocationInRange((NSUInteger)idx, link.result.range)) {
return link;
}
}
return nil;
}
- (CFIndex)characterIndexAtPoint:(CGPoint)p {
if (!CGRectContainsPoint(self.bounds, p)) {
return NSNotFound;
}
CGRect textRect = [self textRectForBounds:self.bounds limitedToNumberOfLines:self.numberOfLines];
if (!CGRectContainsPoint(textRect, p)) {
return NSNotFound;
}
// Offset tap coordinates by textRect origin to make them relative to the origin of frame
p = CGPointMake(p.x - textRect.origin.x, p.y - textRect.origin.y);
// Convert tap coordinates (start at top left) to CT coordinates (start at bottom left)
p = CGPointMake(p.x, textRect.size.height - p.y);
CGMutablePathRef path = CGPathCreateMutable();
CGPathAddRect(path, NULL, textRect);
CTFrameRef frame = CTFramesetterCreateFrame([self framesetter], CFRangeMake(0, (CFIndex)[self.attributedText length]), path, NULL);
if (frame == NULL) {
CGPathRelease(path);
return NSNotFound;
}
CFArrayRef lines = CTFrameGetLines(frame);
NSInteger numberOfLines = self.numberOfLines > 0 ? MIN(self.numberOfLines, CFArrayGetCount(lines)) : CFArrayGetCount(lines);
if (numberOfLines == 0) {
CFRelease(frame);
CGPathRelease(path);
return NSNotFound;
}
CFIndex idx = NSNotFound;
CGPoint lineOrigins[numberOfLines];
CTFrameGetLineOrigins(frame, CFRangeMake(0, numberOfLines), lineOrigins);
for (CFIndex lineIndex = 0; lineIndex < numberOfLines; lineIndex++) {
CGPoint lineOrigin = lineOrigins[lineIndex];
CTLineRef line = CFArrayGetValueAtIndex(lines, lineIndex);
// Get bounding information of line
CGFloat ascent = 0.0f, descent = 0.0f, leading = 0.0f;
CGFloat width = (CGFloat)CTLineGetTypographicBounds(line, &ascent, &descent, &leading);
CGFloat yMin = (CGFloat)floor(lineOrigin.y - descent);
CGFloat yMax = (CGFloat)ceil(lineOrigin.y + ascent);
// Apply penOffset using flushFactor for horizontal alignment to set lineOrigin since this is the horizontal offset from drawFramesetter
CGFloat flushFactor = TTTFlushFactorForTextAlignment(self.textAlignment);
CGFloat penOffset = (CGFloat)CTLineGetPenOffsetForFlush(line, flushFactor, textRect.size.width);
lineOrigin.x = penOffset;
// Check if we've already passed the line
if (p.y > yMax) {
break;
}
// Check if the point is within this line vertically
if (p.y >= yMin) {
// Check if the point is within this line horizontally
if (p.x >= lineOrigin.x && p.x <= lineOrigin.x + width) {
// Convert CT coordinates to line-relative coordinates
CGPoint relativePoint = CGPointMake(p.x - lineOrigin.x, p.y - lineOrigin.y);
idx = CTLineGetStringIndexForPosition(line, relativePoint);
break;
}
}
}
CFRelease(frame);
CGPathRelease(path);
return idx;
}
- (CGRect)boundingRectForCharacterRange:(NSRange)range {
NSMutableAttributedString *mutableAttributedString = [self.attributedText mutableCopy];
NSTextStorage *textStorage = [[NSTextStorage alloc] initWithAttributedString:mutableAttributedString];
NSLayoutManager *layoutManager = [[NSLayoutManager alloc] init];
[textStorage addLayoutManager:layoutManager];
NSTextContainer *textContainer = [[NSTextContainer alloc] initWithSize:self.bounds.size];
[layoutManager addTextContainer:textContainer];
NSRange glyphRange;
[layoutManager characterRangeForGlyphRange:range actualGlyphRange:&glyphRange];
return [layoutManager boundingRectForGlyphRange:glyphRange inTextContainer:textContainer];
}
- (void)drawFramesetter:(CTFramesetterRef)framesetter
attributedString:(NSAttributedString *)attributedString
textRange:(CFRange)textRange
inRect:(CGRect)rect
context:(CGContextRef)c
{
CGMutablePathRef path = CGPathCreateMutable();
CGPathAddRect(path, NULL, rect);
CTFrameRef frame = CTFramesetterCreateFrame(framesetter, textRange, path, NULL);
[self drawBackground:frame inRect:rect context:c];
CFArrayRef lines = CTFrameGetLines(frame);
NSInteger numberOfLines = self.numberOfLines > 0 ? MIN(self.numberOfLines, CFArrayGetCount(lines)) : CFArrayGetCount(lines);
BOOL truncateLastLine = (self.lineBreakMode == TTTLineBreakByTruncatingHead || self.lineBreakMode == TTTLineBreakByTruncatingMiddle || self.lineBreakMode == TTTLineBreakByTruncatingTail);
CGPoint lineOrigins[numberOfLines];
CTFrameGetLineOrigins(frame, CFRangeMake(0, numberOfLines), lineOrigins);
for (CFIndex lineIndex = 0; lineIndex < numberOfLines; lineIndex++) {
CGPoint lineOrigin = lineOrigins[lineIndex];
CGContextSetTextPosition(c, lineOrigin.x, lineOrigin.y);
CTLineRef line = CFArrayGetValueAtIndex(lines, lineIndex);
CGFloat descent = 0.0f;
CTLineGetTypographicBounds((CTLineRef)line, NULL, &descent, NULL);
// Adjust pen offset for flush depending on text alignment
CGFloat flushFactor = TTTFlushFactorForTextAlignment(self.textAlignment);
if (lineIndex == numberOfLines - 1 && truncateLastLine) {
// Check if the range of text in the last line reaches the end of the full attributed string
CFRange lastLineRange = CTLineGetStringRange(line);
if (!(lastLineRange.length == 0 && lastLineRange.location == 0) && lastLineRange.location + lastLineRange.length < textRange.location + textRange.length) {
// Get correct truncationType and attribute position
CTLineTruncationType truncationType;
CFIndex truncationAttributePosition = lastLineRange.location;
TTTLineBreakMode lineBreakMode = self.lineBreakMode;
// Multiple lines, only use UILineBreakModeTailTruncation
if (numberOfLines != 1) {
lineBreakMode = TTTLineBreakByTruncatingTail;
}
switch (lineBreakMode) {
case TTTLineBreakByTruncatingHead:
truncationType = kCTLineTruncationStart;
break;
case TTTLineBreakByTruncatingMiddle:
truncationType = kCTLineTruncationMiddle;
truncationAttributePosition += (lastLineRange.length / 2);
break;
case TTTLineBreakByTruncatingTail:
default:
truncationType = kCTLineTruncationEnd;
truncationAttributePosition += (lastLineRange.length - 1);
break;
}
NSAttributedString *attributedTruncationString = self.attributedTruncationToken;
if (!attributedTruncationString) {
NSString *truncationTokenString = @"\u2026"; // Unicode Character 'HORIZONTAL ELLIPSIS' (U+2026)
NSDictionary *truncationTokenStringAttributes = truncationTokenStringAttributes = [attributedString attributesAtIndex:(NSUInteger)truncationAttributePosition effectiveRange:NULL];
attributedTruncationString = [[NSAttributedString alloc] initWithString:truncationTokenString attributes:truncationTokenStringAttributes];
}
CTLineRef truncationToken = CTLineCreateWithAttributedString((__bridge CFAttributedStringRef)attributedTruncationString);
// Append truncationToken to the string
// because if string isn't too long, CT won't add the truncationToken on its own.
// There is no chance of a double truncationToken because CT only adds the
// token if it removes characters (and the one we add will go first)
NSMutableAttributedString *truncationString = [[NSMutableAttributedString alloc] initWithAttributedString:
[attributedString attributedSubstringFromRange:
NSMakeRange((NSUInteger)lastLineRange.location,
(NSUInteger)lastLineRange.length)]];
if (lastLineRange.length > 0) {
// Remove any newline at the end (we don't want newline space between the text and the truncation token). There can only be one, because the second would be on the next line.
unichar lastCharacter = [[truncationString string] characterAtIndex:(NSUInteger)(lastLineRange.length - 1)];
if ([[NSCharacterSet newlineCharacterSet] characterIsMember:lastCharacter]) {
[truncationString deleteCharactersInRange:NSMakeRange((NSUInteger)(lastLineRange.length - 1), 1)];
}
}
[truncationString appendAttributedString:attributedTruncationString];
CTLineRef truncationLine = CTLineCreateWithAttributedString((__bridge CFAttributedStringRef)truncationString);
// Truncate the line in case it is too long.
CTLineRef truncatedLine = CTLineCreateTruncatedLine(truncationLine, rect.size.width, truncationType, truncationToken);
if (!truncatedLine) {
// If the line is not as wide as the truncationToken, truncatedLine is NULL
truncatedLine = CFRetain(truncationToken);
}
CGFloat penOffset = (CGFloat)CTLineGetPenOffsetForFlush(truncatedLine, flushFactor, rect.size.width);
CGContextSetTextPosition(c, penOffset, lineOrigin.y - descent - self.font.descender);
CTLineDraw(truncatedLine, c);
NSRange linkRange;
if ([attributedTruncationString attribute:NSLinkAttributeName atIndex:0 effectiveRange:&linkRange]) {
NSRange tokenRange = [truncationString.string rangeOfString:attributedTruncationString.string];
NSRange tokenLinkRange = NSMakeRange((NSUInteger)(lastLineRange.location+lastLineRange.length)-tokenRange.length, (NSUInteger)tokenRange.length);
[self addLinkToURL:[attributedTruncationString attribute:NSLinkAttributeName atIndex:0 effectiveRange:&linkRange] withRange:tokenLinkRange];
}
CFRelease(truncatedLine);
CFRelease(truncationLine);
CFRelease(truncationToken);
} else {
CGFloat penOffset = (CGFloat)CTLineGetPenOffsetForFlush(line, flushFactor, rect.size.width);
CGContextSetTextPosition(c, penOffset, lineOrigin.y - descent - self.font.descender);
CTLineDraw(line, c);
}
} else {
CGFloat penOffset = (CGFloat)CTLineGetPenOffsetForFlush(line, flushFactor, rect.size.width);
CGContextSetTextPosition(c, penOffset, lineOrigin.y - descent - self.font.descender);
CTLineDraw(line, c);
}
}
[self drawStrike:frame inRect:rect context:c];
CFRelease(frame);
CGPathRelease(path);
}
- (void)drawBackground:(CTFrameRef)frame
inRect:(CGRect)rect
context:(CGContextRef)c
{
NSArray *lines = (__bridge NSArray *)CTFrameGetLines(frame);
CGPoint origins[[lines count]];
CTFrameGetLineOrigins(frame, CFRangeMake(0, 0), origins);
CFIndex lineIndex = 0;
for (id line in lines) {
CGFloat ascent = 0.0f, descent = 0.0f, leading = 0.0f;
CGFloat width = (CGFloat)CTLineGetTypographicBounds((__bridge CTLineRef)line, &ascent, &descent, &leading) ;
for (id glyphRun in (__bridge NSArray *)CTLineGetGlyphRuns((__bridge CTLineRef)line)) {
NSDictionary *attributes = (__bridge NSDictionary *)CTRunGetAttributes((__bridge CTRunRef) glyphRun);
CGColorRef strokeColor = CGColorRefFromColor([attributes objectForKey:kTTTBackgroundStrokeColorAttributeName]);
CGColorRef fillColor = CGColorRefFromColor([attributes objectForKey:kTTTBackgroundFillColorAttributeName]);
UIEdgeInsets fillPadding = [[attributes objectForKey:kTTTBackgroundFillPaddingAttributeName] UIEdgeInsetsValue];
CGFloat cornerRadius = [[attributes objectForKey:kTTTBackgroundCornerRadiusAttributeName] floatValue];
CGFloat lineWidth = [[attributes objectForKey:kTTTBackgroundLineWidthAttributeName] floatValue];
if (strokeColor || fillColor) {
CGRect runBounds = CGRectZero;
CGFloat runAscent = 0.0f;
CGFloat runDescent = 0.0f;
runBounds.size.width = (CGFloat)CTRunGetTypographicBounds((__bridge CTRunRef)glyphRun, CFRangeMake(0, 0), &runAscent, &runDescent, NULL) + fillPadding.left + fillPadding.right;
runBounds.size.height = runAscent + runDescent + fillPadding.top + fillPadding.bottom;
CGFloat xOffset = 0.0f;
CFRange glyphRange = CTRunGetStringRange((__bridge CTRunRef)glyphRun);
switch (CTRunGetStatus((__bridge CTRunRef)glyphRun)) {
case kCTRunStatusRightToLeft:
xOffset = CTLineGetOffsetForStringIndex((__bridge CTLineRef)line, glyphRange.location + glyphRange.length, NULL);
break;
default:
xOffset = CTLineGetOffsetForStringIndex((__bridge CTLineRef)line, glyphRange.location, NULL);
break;
}
runBounds.origin.x = origins[lineIndex].x + rect.origin.x + xOffset - fillPadding.left - rect.origin.x;
runBounds.origin.y = origins[lineIndex].y + rect.origin.y - fillPadding.bottom - rect.origin.y;
runBounds.origin.y -= runDescent;
// Don't draw higlightedLinkBackground too far to the right
if (CGRectGetWidth(runBounds) > width) {
runBounds.size.width = width;
}
CGPathRef path = [[UIBezierPath bezierPathWithRoundedRect:CGRectInset(UIEdgeInsetsInsetRect(runBounds, self.linkBackgroundEdgeInset), lineWidth, lineWidth) cornerRadius:cornerRadius] CGPath];
CGContextSetLineJoin(c, kCGLineJoinRound);
if (fillColor) {
CGContextSetFillColorWithColor(c, fillColor);
CGContextAddPath(c, path);
CGContextFillPath(c);
}
if (strokeColor) {
CGContextSetStrokeColorWithColor(c, strokeColor);
CGContextAddPath(c, path);
CGContextStrokePath(c);
}
}
}
lineIndex++;
}
}
- (void)drawStrike:(CTFrameRef)frame
inRect:(__unused CGRect)rect
context:(CGContextRef)c
{
NSArray *lines = (__bridge NSArray *)CTFrameGetLines(frame);
CGPoint origins[[lines count]];
CTFrameGetLineOrigins(frame, CFRangeMake(0, 0), origins);
CFIndex lineIndex = 0;
for (id line in lines) {
CGFloat ascent = 0.0f, descent = 0.0f, leading = 0.0f;
CGFloat width = (CGFloat)CTLineGetTypographicBounds((__bridge CTLineRef)line, &ascent, &descent, &leading) ;
for (id glyphRun in (__bridge NSArray *)CTLineGetGlyphRuns((__bridge CTLineRef)line)) {
NSDictionary *attributes = (__bridge NSDictionary *)CTRunGetAttributes((__bridge CTRunRef) glyphRun);
BOOL strikeOut = [[attributes objectForKey:kTTTStrikeOutAttributeName] boolValue];
NSInteger superscriptStyle = [[attributes objectForKey:(id)kCTSuperscriptAttributeName] integerValue];
if (strikeOut) {
CGRect runBounds = CGRectZero;
CGFloat runAscent = 0.0f;
CGFloat runDescent = 0.0f;
runBounds.size.width = (CGFloat)CTRunGetTypographicBounds((__bridge CTRunRef)glyphRun, CFRangeMake(0, 0), &runAscent, &runDescent, NULL);
runBounds.size.height = runAscent + runDescent;
CGFloat xOffset = 0.0f;
CFRange glyphRange = CTRunGetStringRange((__bridge CTRunRef)glyphRun);
switch (CTRunGetStatus((__bridge CTRunRef)glyphRun)) {
case kCTRunStatusRightToLeft:
xOffset = CTLineGetOffsetForStringIndex((__bridge CTLineRef)line, glyphRange.location + glyphRange.length, NULL);
break;
default:
xOffset = CTLineGetOffsetForStringIndex((__bridge CTLineRef)line, glyphRange.location, NULL);
break;
}
runBounds.origin.x = origins[lineIndex].x + xOffset;
runBounds.origin.y = origins[lineIndex].y;
runBounds.origin.y -= runDescent;
// Don't draw strikeout too far to the right
if (CGRectGetWidth(runBounds) > width) {
runBounds.size.width = width;
}
switch (superscriptStyle) {
case 1:
runBounds.origin.y -= runAscent * 0.47f;
break;
case -1:
runBounds.origin.y += runAscent * 0.25f;
break;
default:
break;
}
// Use text color, or default to black
id color = [attributes objectForKey:(id)kCTForegroundColorAttributeName];
if (color) {
CGContextSetStrokeColorWithColor(c, CGColorRefFromColor(color));
} else {
CGContextSetGrayStrokeColor(c, 0.0f, 1.0);
}
CTFontRef font = CTFontCreateWithName((__bridge CFStringRef)self.font.fontName, self.font.pointSize, NULL);
CGContextSetLineWidth(c, CTFontGetUnderlineThickness(font));
CFRelease(font);
CGFloat y = CGFloat_round(runBounds.origin.y + runBounds.size.height / 2.0f);
CGContextMoveToPoint(c, runBounds.origin.x, y);
CGContextAddLineToPoint(c, runBounds.origin.x + runBounds.size.width, y);
CGContextStrokePath(c);
}
}