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README.md
YYText
Powerful text framework for iOS to display and edit rich text.
(It's a component of YYKit)
Features
- UILabel and UITextView API compatible
- High performance asynchronous text layout and rendering
- Extended CoreText attributes with more text effects
- Text attachments with UIImage, UIView and CALayer
- Custom highlight text range to allow user interact with
- Text parser support (built in markdown/emoticon parser)
- Text container path and exclusion paths support
- Vertical form layout support (for CJK text)
- Image and attributed text copy/paste support
- Attributed text placeholder support
- Custom keyboard view support
- Undo and redo control
- Attributed text archiver and unarchiver support
- Multi-language and VoiceOver support
- Interface Builder support
- Fully documented
Architecture
YYText vs TextKit
Text Attributes
YYText supported attributes
| Demo | Attribute Name | Class |
|---|---|---|
| TextAttachment | YYTextAttachment | |
| TextHighlight | YYTextHighlight | |
| TextBinding | YYTextBinding | |
| TextShadow TextInnerShadow |
YYTextShadow | |
| TextBorder | YYTextBorder | |
| TextBackgroundBorder | YYTextBorder | |
| TextBlockBorder | YYTextBorder | |
| TextGlyphTransform | NSValue(CGAffineTransform) | |
| TextUnderline | YYTextDecoration | |
| TextStrickthrough | YYTextDecoration | |
| TextBackedString | YYTextBackedString |
###CoreText attributes which is supported by YYText
Usage
Basic
// YYLabel (similar to UILabel)
YYLabel *label = [YYLabel new];
label.frame = ...
label.font = ...
label.textColor = ...
label.textAlignment = ...
label.lineBreakMode = ...
label.numberOfLines = ...
label.text = ...
// YYTextView (similar to UITextView)
YYTextView *textView = [YYTextView new];
textView.frame = ...
textView.font = ...
textView.textColor = ...
textView.dataDetectorTypes = ...
textView.placeHolderText = ...
textView.placeHolderTextColor = ...
textView.delegate = ...
Attributed text
// 1. Create an attributed string.
NSMutableAttributedString *text = [[NSMutableAttributedString alloc] initWithString:@"Some Text, blabla..."];
// 2. Set attributes to text, you can use almost all CoreText attributes.
text.yy_font = [UIFont boldSystemFontOfSize:30];
text.yy_color = [UIColor blueColor];
[text yy_setColor:[UIColor redColor] range:NSMakeRange(0, 4)];
text.yy_lineSpacing = 10;
// 3. Set to YYLabel or YYTextView.
YYLabel *label = [YYLabel new];
label.frame = ...
label.attributedString = text;
YYTextView *textView = [YYTextView new];
textView.frame = ...
textView.attributedString = text;
Text highlight
You can use some convenience methods to set text highlight:
[text yy_setTextHighlightRange:range
color:[UIColor blueColor]
backgroundColor:[UIColor grayColor]
tapAction:^(UIView *containerView, NSAttributedString *text, NSRange range, CGRect rect){
NSLog(@"tap text range:...");
}];
Or set the text highlight with your custom config:
// 1. Create a 'highlight' attribute for text.
YYTextBorder *border = [YYTextBorder borderWithFillColor:[UIColor grayColor] cornerRadius:3];
YYTextHighlight *highlight = [YYTextHighlight new];
[highlight setColor:[UIColor whiteColor]];
[highlight setBackgroundBorder:highlightBorder];
highlight.tapAction = ^(UIView *containerView, NSAttributedString *text, NSRange range, CGRect rect) {
NSLog(@"tap text range:...");
// you can also set the action handler to YYLabel or YYTextView.
};
// 2. Add 'highlight' attribute to a range of text.
[attributedText yy_setTextHighlight:highlight range:highlightRange];
// 3. Set text to label or text view.
YYLabel *label = ...
label.attributedText = attributedText
YYTextView *textView = ...
textView.attributedText = ...
// 4. Receive user interactive action.
label.highlightTapAction = ^(UIView *containerView, NSAttributedString *text, NSRange range, CGRect rect) {
NSLog(@"tap text range:...");
};
label.highlightLongPressAction = ^(UIView *containerView, NSAttributedString *text, NSRange range, CGRect rect) {
NSLog(@"long press text range:...");
};
@UITextViewDelegate
- (void)textView:(YYTextView *)textView didTapHighlight:(YYTextHighlight *)highlight inRange:(NSRange)characterRange rect:(CGRect)rect {
NSLog(@"tap text range:...");
}
- (void)textView:(YYTextView *)textView didLongPressHighlight:(YYTextHighlight *)highlight inRange:(NSRange)characterRange rect:(CGRect)rect {
NSLog(@"long press text range:...");
}
Text attachments
NSMutableAttributedString *text = [NSMutableAttributedString new];
UIFont *font = [UIFont systemFontOfSize:16];
NSMutableAttributedString *attachment = nil;
// UIImage attachment
UIImage *image = [UIImage imageNamed:@"dribbble64_imageio"];
attachment = [NSMutableAttributedString yy_attachmentStringWithContent:image contentMode:UIViewContentModeCenter attachmentSize:image.size alignToFont:font alignment:YYTextVerticalAlignmentCenter];
[text appendAttributedString: attachment];
// UIView attachment
UISwitch *switcher = [UISwitch new];
[switcher sizeToFit];
attachment = [NSMutableAttributedString yy_attachmentStringWithContent:switcher contentMode:UIViewContentModeBottom attachmentSize:switcher.size alignToFont:font alignment:YYTextVerticalAlignmentCenter];
[text appendAttributedString: attachment];
// CALayer attachment
CASharpLayer *layer = [CASharpLayer layer];
layer.path = ...
attachment = [NSMutableAttributedString yy_attachmentStringWithContent:layer contentMode:UIViewContentModeBottom attachmentSize:switcher.size alignToFont:font alignment:YYTextVerticalAlignmentCenter];
[text appendAttributedString: attachment];
Text layout calculation
NSAttributedString *text = ...
CGSize size = CGSizeMake(100, CGFLOAT_MAX);
YYTextLayout *layout = [YYTextLayout layoutWithContainerSize:size text:text];
// get text bounding
layout.textBoundingRect; // get bounding rect
layout.textBoundingSize; // get bounding size
// query text layout
[layout lineIndexForPoint:CGPointMake(10,10)];
[layout closestLineIndexForPoint:CGPointMake(10,10)];
[layout closestPositionToPoint:CGPointMake(10,10)];
[layout textRangeAtPoint:CGPointMake(10,10)];
[layout rectForRange:[YYTextRange rangeWithRange:NSMakeRange(10,2)]];
[layout selectionRectsForRange:[YYTextRange rangeWithRange:NSMakeRange(10,2)]];
// text layout display
YYLabel *label = [YYLabel new];
label.size = layout.textBoundingSize;
label.textLayout = layout;
Adjust text line position
// Convenience methods:
// 1. Create a text line position modifier, implements `YYTextLinePositionModifier` protocol.
// 2. Set it to label or text view.
YYTextLinePositionSimpleModifier *modifier = [YYTextLinePositionSimpleModifier new];
modifier.fixedLineHeight = 24;
YYLabel *label = [YYLabel new];
label.linePositionModifier = modifier;
// Fully control
YYTextLinePositionSimpleModifier *modifier = [YYTextLinePositionSimpleModifier new];
modifier.fixedLineHeight = 24;
YYTextContainer *container = [YYTextContainer new];
container.size = CGSizeMake(100, CGFLOAT_MAX);
container.linePositionModifier = modifier;
YYTextLayout *layout = [YYTextLayout layoutWithContainer:container text:text];
YYLabel *label = [YYLabel new];
label.size = layout.textBoundingSize;
label.textLayout = layout;
Asynchronous layout and rendering
// If you have performance issues,
// you may enable the asynchronous display mode.
YYLabel *label = ...
label.displaysAsynchronously = YES;
// If you want to get the highest performance, you should do
// text layout with `YYTextLayout` class in background thread.
YYLabel *label = [YYLabel new];
label.displaysAsynchronously = YES;
label.ignoreCommonProperties = YES;
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
// Create attributed string.
NSMutableAttributedString *text = [[NSMutableAttributedString alloc] initWithString:@"Some Text"];
text.yy_font = [UIFont systemFontOfSize:16];
text.yy_color = [UIColor grayColor];
[text yy_setColor:[UIColor redColor] range:NSMakeRange(0, 4)];
// Create text container
YYTextContainer *container = [YYTextContainer new];
container.size = CGSizeMake(100, CGFLOAT_MAX);
container.maximumNumberOfRows = 0;
// Generate a text layout.
YYTextLayout *layout = [YYTextLayout layoutWithContainer:container text:text];
dispatch_async(dispatch_get_main_queue(), ^{
label.size = layout.textBoundingSize;
label.textLayout = layout;
});
});
Text container control
YYLabel *label = ...
label.textContainerPath = [UIBezierPath bezierPathWith...];
label.exclusionPaths = @[[UIBezierPath bezierPathWith...];,...];
label.textContainerInset = UIEdgeInsetsMake(...);
label.verticalForm = YES/NO;
YYTextView *textView = ...
textView.exclusionPaths = @[[UIBezierPath bezierPathWith...];,...];
textView.textContainerInset = UIEdgeInsetsMake(...);
textView.verticalForm = YES/NO;
Text parser
// 1. Create a text parser
YYTextSimpleEmoticonParser *parser = [YYTextSimpleEmoticonParser new];
NSMutableDictionary *mapper = [NSMutableDictionary new];
mapper[@":smile:"] = [UIImage imageNamed:@"smile.png"];
mapper[@":cool:"] = [UIImage imageNamed:@"cool.png"];
mapper[@":cry:"] = [UIImage imageNamed:@"cry.png"];
mapper[@":wink:"] = [UIImage imageNamed:@"wink.png"];
parser.emoticonMapper = mapper;
YYTextSimpleMarkdownParser *parser = [YYTextSimpleMarkdownParser new];
[parser setColorWithDarkTheme];
MyCustomParser *parser = ... // custom parser
// 2. Attach parser to label or text view
YYLabel *label = ...
label.textParser = parser;
YYTextView *textView = ...
textView.textParser = parser;
Debug
// Set a shared debug option to show text layout result.
YYTextDebugOption *debugOptions = [YYTextDebugOption new];
debugOptions.baselineColor = [UIColor redColor];
debugOptions.CTFrameBorderColor = [UIColor redColor];
debugOptions.CTLineFillColor = [UIColor colorWithRed:0.000 green:0.463 blue:1.000 alpha:0.180];
debugOptions.CGGlyphBorderColor = [UIColor colorWithRed:1.000 green:0.524 blue:0.000 alpha:0.200];
[YYTextDebugOption setSharedDebugOption:debugOptions];
More examples
See Demo/YYTextDemo.xcodeproj for more examples:
Installation
CocoaPods
- Add
pod 'YYText'to your Podfile. - Run
pod installorpod update. - Import <YYText/YYText.h>.
Carthage
- Add
github "ibireme/YYText"to your Cartfile. - Run
carthage update --platform iosand add the framework to your project. - Import <YYText/YYText.h>.
Manually
- Download all the files in the
YYTextsubdirectory. - Add the source files to your Xcode project.
- Link with required frameworks:
- UIKit
- CoreFoundation
- CoreText
- QuartzCore
- Accelerate
- MobileCoreServices
- Import
YYText.h.
Notice
You may add YYImage or YYWebImage to your project if you want to support animated image (GIF/APNG/WebP).
Documentation
Full API documentation is available on CocoaDocs.
You can also install documentation locally using appledoc.
Requirements
This library requires iOS 6.0+ and Xcode 7.0+.
License
YYText is released under the MIT license. See LICENSE file for details.
中文介绍
功能强大的 iOS 富文本编辑与显示框架。
(该项目是 YYKit 组件之一)
特性
- API 兼容 UILabel 和 UITextView
- 支持高性能的异步排版和渲染
- 扩展了 CoreText 的属性以支持更多文字效果
- 支持 UIImage、UIView、CALayer 作为图文混排元素
- 支持添加自定义样式的、可点击的文本高亮范围
- 支持自定义文本解析 (内置简单的 Markdown/表情解析)
- 支持文本容器路径、内部留空路径的控制
- 支持文字竖排版，可用于编辑和显示中日韩文本
- 支持图片和富文本的复制粘贴
- 文本编辑时，支持富文本占位符
- 支持自定义键盘视图
- 撤销和重做次数的控制
- 富文本的序列化与反序列化支持
- 支持多语言，支持 VoiceOver
- 支持 Interface Builder
- 全部代码都有文档注释
架构
YYText 和 TextKit 架构对比
文本属性
YYText 原生支持的属性
| Demo | Attribute Name | Class |
|---|---|---|
| TextAttachment | YYTextAttachment | |
| TextHighlight | YYTextHighlight | |
| TextBinding | YYTextBinding | |
| TextShadow TextInnerShadow |
YYTextShadow | |
| TextBorder | YYTextBorder | |
| TextBackgroundBorder | YYTextBorder | |
| TextBlockBorder | YYTextBorder | |
| TextGlyphTransform | NSValue(CGAffineTransform) | |
| TextUnderline | YYTextDecoration | |
| TextStrickthrough | YYTextDecoration | |
| TextBackedString | YYTextBackedString |
###YYText 支持的 CoreText 属性
用法
基本用法
// YYLabel (和 UILabel 用法一致)
YYLabel *label = [YYLabel new];
label.frame = ...
label.font = ...
label.textColor = ...
label.textAlignment = ...
label.lineBreakMode = ...
label.numberOfLines = ...
label.text = ...
// YYTextView (和 UITextView 用法一致)
YYTextView *textView = [YYTextView new];
textView.frame = ...
textView.font = ...
textView.textColor = ...
textView.dataDetectorTypes = ...
textView.placeHolderText = ...
textView.placeHolderTextColor = ...
textView.delegate = ...
属性文本
// 1. 创建一个属性文本
NSMutableAttributedString *text = [[NSMutableAttributedString alloc] initWithString:@"Some Text, blabla..."];
// 2. 为文本设置属性
text.yy_font = [UIFont boldSystemFontOfSize:30];
text.yy_color = [UIColor blueColor];
[text yy_setColor:[UIColor redColor] range:NSMakeRange(0, 4)];
text.yy_lineSpacing = 10;
// 3. 赋值到 YYLabel 或 YYTextView
YYLabel *label = [YYLabel new];
label.frame = ...
label.attributedString = text;
YYTextView *textView = [YYTextView new];
textView.frame = ...
textView.attributedString = text;
文本高亮
你可以用一些已经封装好的简便方法来设置文本高亮：
[text yy_setTextHighlightRange:range
color:[UIColor blueColor]
backgroundColor:[UIColor grayColor]
tapAction:^(UIView *containerView, NSAttributedString *text, NSRange range, CGRect rect){
NSLog(@"tap text range:...");
}];
或者用更复杂的办法来调节文本高亮的细节：
// 1. 创建一个"高亮"属性，当用户点击了高亮区域的文本时，"高亮"属性会替换掉原本的属性
YYTextBorder *border = [YYTextBorder borderWithFillColor:[UIColor grayColor] cornerRadius:3];
YYTextHighlight *highlight = [YYTextHighlight new];
[highlight setColor:[UIColor whiteColor]];
[highlight setBackgroundBorder:highlightBorder];
highlight.tapAction = ^(UIView *containerView, NSAttributedString *text, NSRange range, CGRect rect) {
NSLog(@"tap text range:...");
// 你也可以把事件回调放到 YYLabel 和 YYTextView 来处理。
};
// 2. 把"高亮"属性设置到某个文本范围
[attributedText yy_setTextHighlight:highlight range:highlightRange];
// 3. 把属性文本设置到 YYLabel 或 YYTextView
YYLabel *label = ...
label.attributedText = attributedText
YYTextView *textView = ...
textView.attributedText = ...
// 4. 接受事件回调
label.highlightTapAction = ^(UIView *containerView, NSAttributedString *text, NSRange range, CGRect rect) {
NSLog(@"tap text range:...");
};
label.highlightLongPressAction = ^(UIView *containerView, NSAttributedString *text, NSRange range, CGRect rect) {
NSLog(@"long press text range:...");
};
@UITextViewDelegate
- (void)textView:(YYTextView *)textView didTapHighlight:(YYTextHighlight *)highlight inRange:(NSRange)characterRange rect:(CGRect)rect {
NSLog(@"tap text range:...");
}
- (void)textView:(YYTextView *)textView didLongPressHighlight:(YYTextHighlight *)highlight inRange:(NSRange)characterRange rect:(CGRect)rect {
NSLog(@"long press text range:...");
}
图文混排
NSMutableAttributedString *text = [NSMutableAttributedString new];
UIFont *font = [UIFont systemFontOfSize:16];
NSMutableAttributedString *attachment = nil;
// 嵌入 UIImage
UIImage *image = [UIImage imageNamed:@"dribbble64_imageio"];
attachment = [NSMutableAttributedString yy_attachmentStringWithContent:image contentMode:UIViewContentModeCenter attachmentSize:image.size alignToFont:font alignment:YYTextVerticalAlignmentCenter];
[text appendAttributedString: attachment];
// 嵌入 UIView
UISwitch *switcher = [UISwitch new];
[switcher sizeToFit];
attachment = [NSMutableAttributedString yy_attachmentStringWithContent:switcher contentMode:UIViewContentModeBottom attachmentSize:switcher.size alignToFont:font alignment:YYTextVerticalAlignmentCenter];
[text appendAttributedString: attachment];
// 嵌入 CALayer
CASharpLayer *layer = [CASharpLayer layer];
layer.path = ...
attachment = [NSMutableAttributedString yy_attachmentStringWithContent:layer contentMode:UIViewContentModeBottom attachmentSize:switcher.size alignToFont:font alignment:YYTextVerticalAlignmentCenter];
[text appendAttributedString: attachment];
文本布局计算
NSAttributedString *text = ...
CGSize size = CGSizeMake(100, CGFLOAT_MAX);
YYTextLayout *layout = [YYTextLayout layoutWithContainerSize:size text:text];
// 获取文本显示位置和大小
layout.textBoundingRect; // get bounding rect
layout.textBoundingSize; // get bounding size
// 查询文本排版结果
[layout lineIndexForPoint:CGPointMake(10,10)];
[layout closestLineIndexForPoint:CGPointMake(10,10)];
[layout closestPositionToPoint:CGPointMake(10,10)];
[layout textRangeAtPoint:CGPointMake(10,10)];
[layout rectForRange:[YYTextRange rangeWithRange:NSMakeRange(10,2)]];
[layout selectionRectsForRange:[YYTextRange rangeWithRange:NSMakeRange(10,2)]];
// 显示文本排版结果
YYLabel *label = [YYLabel new];
label.size = layout.textBoundingSize;
label.textLayout = layout;
文本行位置调整
// 由于中文、英文、Emoji 等字体高度不一致，或者富文本中出现了不同字号的字体，
// 可能会造成每行文字的高度不一致。这里可以添加一个修改器来实现固定行高，或者自定义文本行位置。
// 简单的方法:
// 1. 创建一个文本行位置修改类，实现 `YYTextLinePositionModifier` 协议。
// 2. 设置到 Label 或 TextView。
YYTextLinePositionSimpleModifier *modifier = [YYTextLinePositionSimpleModifier new];
modifier.fixedLineHeight = 24;
YYLabel *label = [YYLabel new];
label.linePositionModifier = modifier;
// 完全控制:
YYTextLinePositionSimpleModifier *modifier = [YYTextLinePositionSimpleModifier new];
modifier.fixedLineHeight = 24;
YYTextContainer *container = [YYTextContainer new];
container.size = CGSizeMake(100, CGFLOAT_MAX);
container.linePositionModifier = modifier;
YYTextLayout *layout = [YYTextLayout layoutWithContainer:container text:text];
YYLabel *label = [YYLabel new];
label.size = layout.textBoundingSize;
label.textLayout = layout;
异步排版和渲染
// 如果你在显示字符串时有性能问题，可以这样开启异步模式：
YYLabel *label = ...
label.displaysAsynchronously = YES;
// 如果需要获得最高的性能，你可以在后台线程用 `YYTextLayout` 进行预排版：
YYLabel *label = [YYLabel new];
label.displaysAsynchronously = YES; //开启异步绘制
label.ignoreCommonProperties = YES; //忽略除了 textLayout 之外的其他属性
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
// 创建属性字符串
NSMutableAttributedString *text = [[NSMutableAttributedString alloc] initWithString:@"Some Text"];
text.yy_font = [UIFont systemFontOfSize:16];
text.yy_color = [UIColor grayColor];
[text yy_setColor:[UIColor redColor] range:NSMakeRange(0, 4)];
// 创建文本容器
YYTextContainer *container = [YYTextContainer new];
container.size = CGSizeMake(100, CGFLOAT_MAX);
container.maximumNumberOfRows = 0;
// 生成排版结果
YYTextLayout *layout = [YYTextLayout layoutWithContainer:container text:text];
dispatch_async(dispatch_get_main_queue(), ^{
label.size = layout.textBoundingSize;
label.textLayout = layout;
});
});
文本容器控制
YYLabel *label = ...
label.textContainerPath = [UIBezierPath bezierPathWith...];
label.exclusionPaths = @[[UIBezierPath bezierPathWith...];,...];
label.textContainerInset = UIEdgeInsetsMake(...);
label.verticalForm = YES/NO;
YYTextView *textView = ...
textView.exclusionPaths = @[[UIBezierPath bezierPathWith...];,...];
textView.textContainerInset = UIEdgeInsetsMake(...);
textView.verticalForm = YES/NO;
文本解析
// 1. 创建一个解析器
// 内置简单的表情解析
YYTextSimpleEmoticonParser *parser = [YYTextSimpleEmoticonParser new];
NSMutableDictionary *mapper = [NSMutableDictionary new];
mapper[@":smile:"] = [UIImage imageNamed:@"smile.png"];
mapper[@":cool:"] = [UIImage imageNamed:@"cool.png"];
mapper[@":cry:"] = [UIImage imageNamed:@"cry.png"];
mapper[@":wink:"] = [UIImage imageNamed:@"wink.png"];
parser.emoticonMapper = mapper;
// 内置简单的 markdown 解析
YYTextSimpleMarkdownParser *parser = [YYTextSimpleMarkdownParser new];
[parser setColorWithDarkTheme];
// 实现 `YYTextParser` 协议的自定义解析器
MyCustomParser *parser = ...
// 2. 把解析器添加到 YYLabel 或 YYTextView
YYLabel *label = ...
label.textParser = parser;
YYTextView *textView = ...
textView.textParser = parser;
Debug
// 设置一个全局的 debug option 来显示排版结果。
YYTextDebugOption *debugOptions = [YYTextDebugOption new];
debugOptions.baselineColor = [UIColor redColor];
debugOptions.CTFrameBorderColor = [UIColor redColor];
debugOptions.CTLineFillColor = [UIColor colorWithRed:0.000 green:0.463 blue:1.000 alpha:0.180];
debugOptions.CGGlyphBorderColor = [UIColor colorWithRed:1.000 green:0.524 blue:0.000 alpha:0.200];
[YYTextDebugOption setSharedDebugOption:debugOptions];
更多示例
查看演示工程 Demo/YYTextDemo.xcodeproj:
安装
CocoaPods
- 在 Podfile 中添加
pod 'YYText'。 - 执行
pod install或pod update。 - 导入 <YYText/YYText.h>。
Carthage
- 在 Cartfile 中添加
github "ibireme/YYText"。 - 执行
carthage update --platform ios并将生成的 framework 添加到你的工程。 - 导入 <YYText/YYText.h>。
手动安装
- 下载 YYText 文件夹内的所有内容。
- 将 YYText 内的源文件添加(拖放)到你的工程。
- 链接以下 frameworks:
- UIKit
- CoreFoundation
- CoreText
- QuartzCore
- Accelerate
- MobileCoreServices
- 导入
YYText.h。
注意
你可以添加 YYImage 或 YYWebImage 到你的工程，以支持动画格式(GIF/APNG/WebP)的图片。
文档
你可以在 CocoaDocs 查看在线 API 文档，也可以用 appledoc 本地生成文档。
系统要求
该项目最低支持 iOS 6.0 和 Xcode 7.0。
已知问题
- YYText 并不能支持所有 CoreText/TextKit 的属性，比如 NSBackgroundColor、NSStrikethrough、NSUnderline、NSAttachment、NSLink 等，但 YYText 中基本都有对应属性作为替代。详情见上方表格。
- YYTextView 未实现局部刷新，所以在输入和编辑大量的文本（比如超过大概五千个汉字、或大概一万个英文字符）时会出现较明显的卡顿现象。
- 竖排版时，添加 exclusionPaths 在少数情况下可能会导致文本显示空白。
- 当添加了非矩形的 textContainerPath，并且有嵌入大于文本排版方向宽度的 RunDelegate 时，RunDelegate 之后的文字会无法显示。这是 CoreText 的 Bug（或者说是 Feature）。
许可证
YYText 使用 MIT 许可证，详情见 LICENSE 文件。