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JVFloatLabeledTextView.m
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JVFloatLabeledTextView.m
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//
// JVFloatLabeledTextView.m
// JVFloatLabeledTextField
//
// The MIT License (MIT)
//
// Copyright (c) 2013-2015 Jared Verdi
// Original Concept by Matt D. Smith
// http://dribbble.com/shots/1254439--GIF-Mobile-Form-Interaction?list=users
//
// 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 "JVFloatLabeledTextView.h"
#import "NSString+TextDirectionality.h"
static CGFloat const kFloatingLabelShowAnimationDuration = 0.3f;
static CGFloat const kFloatingLabelHideAnimationDuration = 0.3f;
@interface JVFloatLabeledTextView ()
@end
@implementation JVFloatLabeledTextView
- (instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self commonInit];
}
return self;
}
- (instancetype)initWithFrame:(CGRect)frame textContainer:(NSTextContainer *)textContainer
{
self = [super initWithFrame:frame textContainer:textContainer];
if (self) {
[self commonInit];
}
return self;
}
- (instancetype)initWithCoder:(NSCoder *)aDecoder
{
self = [super initWithCoder:aDecoder];
if (self) {
[self commonInit];
// force setter to be called on a placeholder defined in a NIB/Storyboard
if (self.placeholder) {
self.placeholder = self.placeholder;
}
}
return self;
}
- (void)commonInit
{
self.startingTextContainerInsetTop = self.textContainerInset.top;
self.floatingLabelShouldLockToTop = YES;
self.textContainer.lineFragmentPadding = 0;
_placeholderLabel = [[UILabel alloc] initWithFrame:self.frame];
if (!self.font) {
// by default self.font may be nil - so make UITextView use UILabel's default
self.font = _placeholderLabel.font;
}
_placeholderLabel.font = self.font;
_placeholderLabel.text = self.placeholder;
_placeholderLabel.numberOfLines = 0;
_placeholderLabel.lineBreakMode = NSLineBreakByWordWrapping;
_placeholderLabel.backgroundColor = [UIColor clearColor];
_placeholderTextColor = [JVFloatLabeledTextView defaultiOSPlaceholderColor];
_placeholderLabel.textColor = _placeholderTextColor;
[self insertSubview:_placeholderLabel atIndex:0];
_floatingLabel = [UILabel new];
_floatingLabel.alpha = 0.0f;
_floatingLabel.backgroundColor = self.backgroundColor;
[self addSubview:_floatingLabel];
// some basic default fonts/colors
_floatingLabelFont = [self defaultFloatingLabelFont];
_floatingLabel.font = _floatingLabelFont;
_floatingLabelTextColor = [UIColor grayColor];
_floatingLabel.textColor = _floatingLabelTextColor;
_animateEvenIfNotFirstResponder = NO;
_floatingLabelShowAnimationDuration = kFloatingLabelShowAnimationDuration;
_floatingLabelHideAnimationDuration = kFloatingLabelHideAnimationDuration;
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(layoutSubviews)
name:UITextViewTextDidChangeNotification
object:self];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(layoutSubviews)
name:UITextViewTextDidBeginEditingNotification
object:self];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(layoutSubviews)
name:UITextViewTextDidEndEditingNotification
object:self];
}
- (void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self
name:UITextViewTextDidChangeNotification
object:self];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:UITextViewTextDidBeginEditingNotification
object:self];
[[NSNotificationCenter defaultCenter] removeObserver:self
name:UITextViewTextDidEndEditingNotification
object:self];
}
#pragma mark -
- (UIFont *)defaultFloatingLabelFont
{
UIFont *textViewFont = nil;
if (!textViewFont && self.placeholderLabel.attributedText && self.placeholderLabel.attributedText.length > 0) {
textViewFont = [self.placeholderLabel.attributedText attribute:NSFontAttributeName atIndex:0 effectiveRange:NULL];
}
if (!textViewFont) {
textViewFont = self.placeholderLabel.font;
}
return [textViewFont fontWithSize:roundf(textViewFont.pointSize * 0.7f)];
}
- (void)setPlaceholder:(NSString *)placeholder
{
_placeholder = placeholder;
_placeholderLabel.text = placeholder;
_floatingLabel.text = placeholder;
if (0 != self.floatingLabelShouldLockToTop) {
_floatingLabel.frame = CGRectMake(_floatingLabel.frame.origin.x,
_floatingLabel.frame.origin.y,
self.frame.size.width,
_floatingLabel.frame.size.height);
}
[self setNeedsLayout];
}
- (void)setPlaceholder:(NSString *)placeholder floatingTitle:(NSString *)floatingTitle
{
_placeholder = placeholder;
_placeholderLabel.text = placeholder;
_floatingLabel.text = floatingTitle;
[self setNeedsLayout];
}
- (void)layoutSubviews
{
[super layoutSubviews];
[self adjustTextContainerInsetTop];
CGSize floatingLabelSize = [_floatingLabel sizeThatFits:_floatingLabel.superview.bounds.size];
_floatingLabel.frame = CGRectMake(_floatingLabel.frame.origin.x,
_floatingLabel.frame.origin.y,
self.frame.size.width,
floatingLabelSize.height);
CGSize placeholderLabelSize = [_placeholderLabel sizeThatFits:_placeholderLabel.superview.bounds.size];
CGRect textRect = [self textRect];
_placeholderLabel.alpha = [self.text length] > 0 ? 0.0f : 1.0f;
_placeholderLabel.frame = CGRectMake(textRect.origin.x, textRect.origin.y,
placeholderLabelSize.width, placeholderLabelSize.height);
[self setLabelOriginForTextAlignment];
BOOL firstResponder = self.isFirstResponder;
_floatingLabel.textColor = (firstResponder && self.text && self.text.length > 0 ?
self.labelActiveColor : self.floatingLabelTextColor);
if ((!self.text || 0 == [self.text length]) && !self.alwaysShowFloatingLabel) {
[self hideFloatingLabel:firstResponder];
}
else {
[self showFloatingLabel:firstResponder];
}
// Without this code, the size of the view is not calculated correctly when it
// is first displayed. Only seems relevant when scroll is disabled.
if (!self.scrollEnabled && !CGSizeEqualToSize(self.bounds.size, [self intrinsicContentSize])) {
[self invalidateIntrinsicContentSize];
}
}
- (CGSize)intrinsicContentSize
{
CGSize textFieldIntrinsicContentSize = [super intrinsicContentSize];
if (self.text != nil && self.text.length > 0) {
return textFieldIntrinsicContentSize;
} else {
CGFloat additionalHeight = _placeholderLabel.bounds.size.height - (_floatingLabel.bounds.size.height + _floatingLabelYPadding);
return CGSizeMake(textFieldIntrinsicContentSize.width,
textFieldIntrinsicContentSize.height + additionalHeight);
}
}
- (UIColor *)labelActiveColor
{
if (_floatingLabelActiveTextColor) {
return _floatingLabelActiveTextColor;
}
else if ([self respondsToSelector:@selector(tintColor)]) {
return [self performSelector:@selector(tintColor)];
}
return [UIColor blueColor];
}
- (void)setAlwaysShowFloatingLabel:(BOOL)alwaysShowFloatingLabel
{
_alwaysShowFloatingLabel = alwaysShowFloatingLabel;
[self setNeedsLayout];
}
- (void)showFloatingLabel:(BOOL)animated
{
void (^showBlock)(void) = ^{
self->_floatingLabel.alpha = 1.0f;
CGFloat top = self->_floatingLabelYPadding;
if (0 != self.floatingLabelShouldLockToTop) {
top += self.contentOffset.y;
}
self->_floatingLabel.frame = CGRectMake(self->_floatingLabel.frame.origin.x,
top,
self->_floatingLabel.frame.size.width,
self->_floatingLabel.frame.size.height);
};
if ((animated || 0 != _animateEvenIfNotFirstResponder)
&& (0 == self.floatingLabelShouldLockToTop || _floatingLabel.alpha != 1.0f)) {
[UIView animateWithDuration:_floatingLabelShowAnimationDuration
delay:0.0f
options:UIViewAnimationOptionBeginFromCurrentState | UIViewAnimationOptionCurveEaseOut
animations:showBlock
completion:nil];
}
else {
showBlock();
}
}
- (void)hideFloatingLabel:(BOOL)animated
{
void (^hideBlock)(void) = ^{
self->_floatingLabel.alpha = 0.0f;
self->_floatingLabel.frame = CGRectMake(self->_floatingLabel.frame.origin.x,
self->_floatingLabel.font.lineHeight + self->_placeholderYPadding,
self->_floatingLabel.frame.size.width,
self->_floatingLabel.frame.size.height);
};
if (animated || 0 != _animateEvenIfNotFirstResponder) {
[UIView animateWithDuration:_floatingLabelHideAnimationDuration
delay:0.0f
options:UIViewAnimationOptionBeginFromCurrentState | UIViewAnimationOptionCurveEaseIn
animations:hideBlock
completion:nil];
}
else {
hideBlock();
}
}
- (void)adjustTextContainerInsetTop
{
self.textContainerInset = UIEdgeInsetsMake(self.startingTextContainerInsetTop
+ _floatingLabel.font.lineHeight + _placeholderYPadding,
self.textContainerInset.left,
self.textContainerInset.bottom,
self.textContainerInset.right);
}
- (void)setLabelOriginForTextAlignment
{
CGFloat floatingLabelOriginX = [self textRect].origin.x;
CGFloat placeholderLabelOriginX = floatingLabelOriginX;
if (self.textAlignment == NSTextAlignmentCenter) {
floatingLabelOriginX = (self.frame.size.width/2) - (_floatingLabel.frame.size.width/2);
placeholderLabelOriginX = (self.frame.size.width/2) - (_placeholderLabel.frame.size.width/2);
}
else if (self.textAlignment == NSTextAlignmentRight) {
floatingLabelOriginX = self.frame.size.width - _floatingLabel.frame.size.width;
placeholderLabelOriginX = (self.frame.size.width
- _placeholderLabel.frame.size.width - self.textContainerInset.right);
}
else if (self.textAlignment == NSTextAlignmentNatural) {
JVTextDirection baseDirection = [_floatingLabel.text getBaseDirection];
if (baseDirection == JVTextDirectionRightToLeft) {
floatingLabelOriginX = self.frame.size.width - _floatingLabel.frame.size.width;
placeholderLabelOriginX = (self.frame.size.width
- _placeholderLabel.frame.size.width - self.textContainerInset.right);
}
}
_floatingLabel.frame = CGRectMake(floatingLabelOriginX + _floatingLabelXPadding, _floatingLabel.frame.origin.y,
_floatingLabel.frame.size.width, _floatingLabel.frame.size.height);
_placeholderLabel.frame = CGRectMake(placeholderLabelOriginX, _placeholderLabel.frame.origin.y,
_placeholderLabel.frame.size.width, _placeholderLabel.frame.size.height);
}
- (CGRect)textRect
{
CGRect rect = UIEdgeInsetsInsetRect(self.bounds, self.contentInset);
if (self.textContainer) {
rect.origin.x += self.textContainer.lineFragmentPadding;
rect.origin.y += self.textContainerInset.top;
}
return rect;
}
- (void)setFloatingLabelFont:(UIFont *)floatingLabelFont
{
_floatingLabelFont = floatingLabelFont;
_floatingLabel.font = _floatingLabelFont ? _floatingLabelFont : [self defaultFloatingLabelFont];
self.placeholder = self.placeholder; // Force the label to lay itself out with the new font.
}
#pragma mark - Apple UITextView defaults
+ (UIColor *)defaultiOSPlaceholderColor
{
return [[UIColor lightGrayColor] colorWithAlphaComponent:0.65f];
}
#pragma mark - UITextView
- (void)setTextAlignment:(NSTextAlignment)textAlignment
{
[super setTextAlignment:textAlignment];
[self setNeedsLayout];
}
- (void)setFont:(UIFont *)font
{
[super setFont:font];
self.placeholderLabel.font = self.font;
[self layoutSubviews];
}
- (void)setText:(NSString *)text
{
[super setText:text];
[self layoutSubviews];
}
- (void)setPlaceholderTextColor:(UIColor *)placeholderTextColor
{
_placeholderTextColor = placeholderTextColor;
_placeholderLabel.textColor = _placeholderTextColor;
}
- (void)setBackgroundColor:(UIColor *)backgroundColor
{
[super setBackgroundColor:backgroundColor];
if (0 != self.floatingLabelShouldLockToTop) {
_floatingLabel.backgroundColor = self.backgroundColor;
}
}
@end