158 lines
4.0 KiB
Objective-C
158 lines
4.0 KiB
Objective-C
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#import "RCTUITextView.h"
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#import <React/UIView+React.h>
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@implementation RCTUITextView
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{
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UILabel *_placeholderView;
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UITextView *_detachedTextView;
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}
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static UIFont *defaultPlaceholderFont()
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{
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return [UIFont systemFontOfSize:17];
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}
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static UIColor *defaultPlaceholderTextColor()
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{
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// Default placeholder color from UITextField.
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return [UIColor colorWithRed:0 green:0 blue:0.0980392 alpha:0.22];
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}
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- (instancetype)initWithFrame:(CGRect)frame
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{
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if (self = [super initWithFrame:frame]) {
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(textDidChange)
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name:UITextViewTextDidChangeNotification
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object:self];
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_placeholderView = [[UILabel alloc] initWithFrame:self.bounds];
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_placeholderView.isAccessibilityElement = NO;
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_placeholderView.numberOfLines = 0;
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[self addSubview:_placeholderView];
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}
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return self;
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}
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- (void)dealloc
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{
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[[NSNotificationCenter defaultCenter] removeObserver:self];
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}
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#pragma mark - Properties
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- (void)setPlaceholderText:(NSString *)placeholderText
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{
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_placeholderText = placeholderText;
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_placeholderView.text = _placeholderText;
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}
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- (void)setPlaceholderTextColor:(UIColor *)placeholderTextColor
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{
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_placeholderTextColor = placeholderTextColor;
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_placeholderView.textColor = _placeholderTextColor ?: defaultPlaceholderTextColor();
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}
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- (void)textDidChange
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{
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_textWasPasted = NO;
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[self invalidatePlaceholderVisibility];
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}
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#pragma mark - Overrides
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- (void)setFont:(UIFont *)font
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{
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[super setFont:font];
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_placeholderView.font = font ?: defaultPlaceholderFont();
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}
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- (void)setTextAlignment:(NSTextAlignment)textAlignment
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{
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[super setTextAlignment:textAlignment];
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_placeholderView.textAlignment = textAlignment;
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}
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- (void)setText:(NSString *)text
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{
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[super setText:text];
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[self textDidChange];
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}
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- (void)setAttributedText:(NSAttributedString *)attributedText
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{
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[super setAttributedText:attributedText];
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[self textDidChange];
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}
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- (void)paste:(id)sender
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{
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[super paste:sender];
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_textWasPasted = YES;
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}
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- (void)setContentOffset:(CGPoint)contentOffset animated:(__unused BOOL)animated
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{
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// Turning off scroll animation.
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// This fixes the problem also known as "flaky scrolling".
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[super setContentOffset:contentOffset animated:NO];
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}
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#pragma mark - Layout
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- (void)layoutSubviews
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{
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[super layoutSubviews];
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CGRect textFrame = UIEdgeInsetsInsetRect(self.bounds, self.textContainerInset);
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CGFloat placeholderHeight = [_placeholderView sizeThatFits:textFrame.size].height;
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textFrame.size.height = MIN(placeholderHeight, textFrame.size.height);
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_placeholderView.frame = textFrame;
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}
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- (CGSize)sizeThatFits:(CGSize)size
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{
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// UITextView on iOS 8 has a bug that automatically scrolls to the top
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// when calling `sizeThatFits:`. Use a copy so that self is not screwed up.
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static BOOL useCustomImplementation = NO;
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static dispatch_once_t onceToken;
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dispatch_once(&onceToken, ^{
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useCustomImplementation = ![[NSProcessInfo processInfo] isOperatingSystemAtLeastVersion:(NSOperatingSystemVersion){9,0,0}];
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});
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if (!useCustomImplementation) {
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return [super sizeThatFits:size];
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}
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if (!_detachedTextView) {
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_detachedTextView = [UITextView new];
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}
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_detachedTextView.attributedText = self.attributedText;
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_detachedTextView.font = self.font;
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_detachedTextView.textContainerInset = self.textContainerInset;
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return [_detachedTextView sizeThatFits:size];
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}
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#pragma mark - Placeholder
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- (void)invalidatePlaceholderVisibility
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{
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BOOL isVisible = _placeholderText.length != 0 && self.text.length == 0;
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_placeholderView.hidden = !isVisible;
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}
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@end
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