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			YYAsyncLayer
			==============

			[![License MIT](https://img.shields.io/badge/license-MIT-green.svg?style=flat)](https://raw.githubusercontent.com/ibireme/YYAsyncLayer/master/LICENSE)
			[![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/Carthage/Carthage)
			[![CocoaPods](http://img.shields.io/cocoapods/v/YYAsyncLayer.svg?style=flat)](http://cocoapods.org/?q=YYAsyncLayer)
			[![CocoaPods](http://img.shields.io/cocoapods/p/YYAsyncLayer.svg?style=flat)](http://cocoapods.org/?q=YYAsyncLayer)
			[![Support](https://img.shields.io/badge/support-iOS%206%2B%20-blue.svg?style=flat)](https://www.apple.com/nl/ios/)
			[![Build Status](https://travis-ci.org/ibireme/YYAsyncLayer.svg?branch=master)](https://travis-ci.org/ibireme/YYAsyncLayer)

			iOS utility classes for asynchronous rendering and display.<br/>
			(It was used by [YYText](https://github.com/ibireme/YYText))


			Simple Usage
			==============

			@interface YYLabel : UIView
			@property NSString *text;
			@property UIFont *font;
			@end

			@implementation YYLabel

			- (void)setText:(NSString *)text {
			_text = text.copy;
			[[YYTransaction transactionWithTarget:self selector:@selector(contentsNeedUpdated)] commit];
			}

			- (void)setFont:(UIFont *)font {
			_font = font;
			[[YYTransaction transactionWithTarget:self selector:@selector(contentsNeedUpdated)] commit];
			}

			- (void)layoutSubviews {
			[super layoutSubviews];
			[[YYTransaction transactionWithTarget:self selector:@selector(contentsNeedUpdated)] commit];
			}

			- (void)contentsNeedUpdated {
			// do update
			[self.layer setNeedsDisplay];
			}

			#pragma mark - YYAsyncLayer

			+ (Class)layerClass {
			return YYAsyncLayer.class;
			}

			- (YYAsyncLayerDisplayTask *)newAsyncDisplayTask {

			// capture current state to display task
			NSString *text = _text;
			UIFont *font = _font;

			YYAsyncLayerDisplayTask *task = [YYAsyncLayerDisplayTask new];
			task.willDisplay = ^(CALayer *layer) {
			//...
			};

			task.display = ^(CGContextRef context, CGSize size, BOOL(^isCancelled)(void)) {
			if (isCancelled()) return;
			NSArray *lines = CreateCTLines(text, font, size.width);
			if (isCancelled()) return;

			for (int i = 0; i < lines.count; i++) {
			CTLineRef line = line[i];
			CGContextSetTextPosition(context, 0, i * font.pointSize * 1.5);
			CTLineDraw(line, context);
			if (isCancelled()) return;
			}
			};

			task.didDisplay = ^(CALayer *layer, BOOL finished) {
			if (finished) {
			// finished
			} else {
			// cancelled
			}
			};

			return task;
			}
			@end


			Installation
			==============

			### CocoaPods

			1. Add `pod 'YYAsyncLayer'` to your Podfile.
			2. Run `pod install` or `pod update`.
			3. Import \<YYAsyncLayer/YYAsyncLayer.h\>.


			### Carthage

			1. Add `github "ibireme/YYAsyncLayer"` to your Cartfile.
			2. Run `carthage update --platform ios` and add the framework to your project.
			3. Import \<YYAsyncLayer/YYAsyncLayer.h\>.


			### Manually

			1. Download all the files in the YYAsyncLayer subdirectory.
			2. Add the source files to your Xcode project.
			3. Import `YYAsyncLayer.h`.


			Documentation
			==============
			Full API documentation is available on [CocoaDocs](http://cocoadocs.org/docsets/YYAsyncLayer/).<br/>
			You can also install documentation locally using [appledoc](https://github.com/tomaz/appledoc).


			Requirements
			==============
			This library requires `iOS 6.0+` and `Xcode 7.0+`.


			License
			==============
			YYAsyncLayer is provided under the MIT license. See LICENSE file for details.




			<br/><br/>
			---
			中文介绍
			==============
			iOS 异步绘制与显示的工具类。<br/>
			(该工具是从 [YYText](https://github.com/ibireme/YYText) 提取出来的独立组件)


			简单用法
			==============

			@interface YYLabel : UIView
			@property NSString *text;
			@property UIFont *font;
			@end

			@implementation YYLabel

			- (void)setText:(NSString *)text {
			_text = text.copy;
			[[YYTransaction transactionWithTarget:self selector:@selector(contentsNeedUpdated)] commit];
			}

			- (void)setFont:(UIFont *)font {
			_font = font;
			[[YYTransaction transactionWithTarget:self selector:@selector(contentsNeedUpdated)] commit];
			}

			- (void)layoutSubviews {
			[super layoutSubviews];
			[[YYTransaction transactionWithTarget:self selector:@selector(contentsNeedUpdated)] commit];
			}

			- (void)contentsNeedUpdated {
			// do update
			[self.layer setNeedsDisplay];
			}

			#pragma mark - YYAsyncLayer

			+ (Class)layerClass {
			return YYAsyncLayer.class;
			}

			- (YYAsyncLayerDisplayTask *)newAsyncDisplayTask {

			// capture current state to display task
			NSString *text = _text;
			UIFont *font = _font;

			YYAsyncLayerDisplayTask *task = [YYAsyncLayerDisplayTask new];
			task.willDisplay = ^(CALayer *layer) {
			//...
			};

			task.display = ^(CGContextRef context, CGSize size, BOOL(^isCancelled)(void)) {
			if (isCancelled()) return;
			NSArray *lines = CreateCTLines(text, font, size.width);
			if (isCancelled()) return;

			for (int i = 0; i < lines.count; i++) {
			CTLineRef line = line[i];
			CGContextSetTextPosition(context, 0, i * font.pointSize * 1.5);
			CTLineDraw(line, context);
			if (isCancelled()) return;
			}
			};

			task.didDisplay = ^(CALayer *layer, BOOL finished) {
			if (finished) {
			// finished
			} else {
			// cancelled
			}
			};

			return task;
			}
			@end


			安装
			==============

			### CocoaPods

			1. 在 Podfile 中添加 `pod 'YYAsyncLayer'`。
			2. 执行 `pod install` 或 `pod update`。
			3. 导入 \<YYAsyncLayer/YYAsyncLayer.h\>。


			### Carthage

			1. 在 Cartfile 中添加 `github "ibireme/YYAsyncLayer"`。
			2. 执行 `carthage update --platform ios` 并将生成的 framework 添加到你的工程。
			3. 导入 \<YYAsyncLayer/YYAsyncLayer.h\>。


			### 手动安装

			1. 下载 YYAsyncLayer 文件夹内的所有内容。
			2. 将 YYAsyncLayer 内的源文件添加(拖放)到你的工程。
			3. 导入 `YYAsyncLayer.h`。


			文档
			==============
			你可以在 [CocoaDocs](http://cocoadocs.org/docsets/YYAsyncLayer/) 查看在线 API 文档，也可以用 [appledoc](https://github.com/tomaz/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`。


			许可证
			==============
			YYAsyncLayer 使用 MIT 许可证，详情见 LICENSE 文件。

			相关文章
			==============
			[iOS 保持界面流畅的技巧
			](http://blog.ibireme.com/2015/11/12/smooth_user_interfaces_for_ios/)