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RCTUITextView.m
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RCTUITextView.m
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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
#import "RCTUITextView.h"
#import <React/RCTUtils.h>
#import <React/UIView+React.h>
#import "RCTBackedTextInputDelegateAdapter.h"
@implementation RCTUITextView
{
UILabel *_placeholderView;
UITextView *_detachedTextView;
RCTBackedTextViewDelegateAdapter *_textInputDelegateAdapter;
}
static UIFont *defaultPlaceholderFont()
{
return [UIFont systemFontOfSize:17];
}
static UIColor *defaultPlaceholderColor()
{
// Default placeholder color from UITextField.
return [UIColor colorWithRed:0 green:0 blue:0.0980392 alpha:0.22];
}
- (instancetype)initWithFrame:(CGRect)frame
{
if (self = [super initWithFrame:frame]) {
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(textDidChange)
name:UITextViewTextDidChangeNotification
object:self];
_placeholderView = [[UILabel alloc] initWithFrame:self.bounds];
_placeholderView.isAccessibilityElement = NO;
_placeholderView.numberOfLines = 0;
_placeholderView.textColor = defaultPlaceholderColor();
[self addSubview:_placeholderView];
_textInputDelegateAdapter = [[RCTBackedTextViewDelegateAdapter alloc] initWithTextView:self];
}
return self;
}
- (void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
- (NSString *)accessibilityLabel
{
NSMutableString *accessibilityLabel = [NSMutableString new];
NSString *superAccessibilityLabel = [super accessibilityLabel];
if (superAccessibilityLabel.length > 0) {
[accessibilityLabel appendString:superAccessibilityLabel];
}
if (self.placeholder.length > 0 && self.text.length == 0) {
if (accessibilityLabel.length > 0) {
[accessibilityLabel appendString:@" "];
}
[accessibilityLabel appendString:self.placeholder];
}
return accessibilityLabel;
}
#pragma mark - Properties
- (void)setPlaceholder:(NSString *)placeholder
{
_placeholder = placeholder;
_placeholderView.text = _placeholder;
}
- (void)setPlaceholderColor:(UIColor *)placeholderColor
{
_placeholderColor = placeholderColor;
_placeholderView.textColor = _placeholderColor ?: defaultPlaceholderColor();
}
- (void)textDidChange
{
_textWasPasted = NO;
[self invalidatePlaceholderVisibility];
}
#pragma mark - Overrides
- (void)setFont:(UIFont *)font
{
[super setFont:font];
_placeholderView.font = font ?: defaultPlaceholderFont();
}
- (void)setTextAlignment:(NSTextAlignment)textAlignment
{
[super setTextAlignment:textAlignment];
_placeholderView.textAlignment = textAlignment;
}
- (void)setText:(NSString *)text
{
[super setText:text];
[self textDidChange];
}
- (void)setAttributedText:(NSAttributedString *)attributedText
{
[super setAttributedText:attributedText];
[self textDidChange];
}
#pragma mark - Overrides
- (void)setSelectedTextRange:(UITextRange *)selectedTextRange notifyDelegate:(BOOL)notifyDelegate
{
if (!notifyDelegate) {
// We have to notify an adapter that following selection change was initiated programmatically,
// so the adapter must not generate a notification for it.
[_textInputDelegateAdapter skipNextTextInputDidChangeSelectionEventWithTextRange:selectedTextRange];
}
[super setSelectedTextRange:selectedTextRange];
}
- (void)paste:(id)sender
{
[super paste:sender];
_textWasPasted = YES;
}
- (void)setContentOffset:(CGPoint)contentOffset animated:(__unused BOOL)animated
{
// Turning off scroll animation.
// This fixes the problem also known as "flaky scrolling".
[super setContentOffset:contentOffset animated:NO];
}
#pragma mark - Layout
- (CGFloat)preferredMaxLayoutWidth
{
// Returning size DOES contain `textContainerInset` (aka `padding`).
return _preferredMaxLayoutWidth ?: self.placeholderSize.width;
}
- (CGSize)placeholderSize
{
UIEdgeInsets textContainerInset = self.textContainerInset;
NSString *placeholder = self.placeholder ?: @"";
CGSize placeholderSize = [placeholder sizeWithAttributes:@{NSFontAttributeName: self.font ?: defaultPlaceholderFont()}];
placeholderSize = CGSizeMake(RCTCeilPixelValue(placeholderSize.width), RCTCeilPixelValue(placeholderSize.height));
placeholderSize.width += textContainerInset.left + textContainerInset.right;
placeholderSize.height += textContainerInset.top + textContainerInset.bottom;
// Returning size DOES contain `textContainerInset` (aka `padding`; as `sizeThatFits:` does).
return placeholderSize;
}
- (CGSize)contentSize
{
CGSize contentSize = super.contentSize;
CGSize placeholderSize = self.placeholderSize;
// When a text input is empty, it actually displays a placehoder.
// So, we have to consider `placeholderSize` as a minimum `contentSize`.
// Returning size DOES contain `textContainerInset` (aka `padding`).
return CGSizeMake(
MAX(contentSize.width, placeholderSize.width),
MAX(contentSize.height, placeholderSize.height));
}
- (void)layoutSubviews
{
[super layoutSubviews];
CGRect textFrame = UIEdgeInsetsInsetRect(self.bounds, self.textContainerInset);
CGFloat placeholderHeight = [_placeholderView sizeThatFits:textFrame.size].height;
textFrame.size.height = MIN(placeholderHeight, textFrame.size.height);
_placeholderView.frame = textFrame;
}
- (CGSize)intrinsicContentSize
{
// Returning size DOES contain `textContainerInset` (aka `padding`).
return [self sizeThatFits:CGSizeMake(self.preferredMaxLayoutWidth, INFINITY)];
}
- (CGSize)sizeThatFits:(CGSize)size
{
// Returned fitting size depends on text size and placeholder size.
CGSize textSize = [self fixedSizeThatFits:size];
CGSize placeholderSize = self.placeholderSize;
// Returning size DOES contain `textContainerInset` (aka `padding`).
return CGSizeMake(MAX(textSize.width, placeholderSize.width), MAX(textSize.height, placeholderSize.height));
}
- (CGSize)fixedSizeThatFits:(CGSize)size
{
// UITextView on iOS 8 has a bug that automatically scrolls to the top
// when calling `sizeThatFits:`. Use a copy so that self is not screwed up.
static BOOL useCustomImplementation = NO;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
useCustomImplementation = ![[NSProcessInfo processInfo] isOperatingSystemAtLeastVersion:(NSOperatingSystemVersion){9,0,0}];
});
if (!useCustomImplementation) {
return [super sizeThatFits:size];
}
if (!_detachedTextView) {
_detachedTextView = [UITextView new];
}
_detachedTextView.attributedText = self.attributedText;
_detachedTextView.font = self.font;
_detachedTextView.textContainerInset = self.textContainerInset;
return [_detachedTextView sizeThatFits:size];
}
#pragma mark - Placeholder
- (void)invalidatePlaceholderVisibility
{
BOOL isVisible = _placeholder.length != 0 && self.text.length == 0;
_placeholderView.hidden = !isVisible;
}
@end