From 3e8437ae559487362fae3525beb79c534c213a51 Mon Sep 17 00:00:00 2001
From: 单军华
Date: Thu, 12 Jul 2018 13:44:34 +0800
Subject: [PATCH] bug修复和功能优化

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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/>
+---
+������������
+==============
+iOS ������������������������������������<br/>
+(��������������� [YYText](https://github.com/ibireme/YYText) ���������������������������)
+
+
+������������
+==============
+
+    @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
+
+
+������
+==============
+
+### CocoaPods
+
+1. ��� Podfile ��������� `pod 'YYAsyncLayer'`���
+2. ������ `pod install` ��� `pod update`���
+3. ������ \<YYAsyncLayer/YYAsyncLayer.h\>���
+
+
+### Carthage
+
+1. ��� Cartfile ��������� `github "ibireme/YYAsyncLayer"`���
+2. ������ `carthage update --platform ios` ��������������� framework ������������������������
+3. ������ \<YYAsyncLayer/YYAsyncLayer.h\>���
+
+
+### ������������
+
+1. ������ YYAsyncLayer ������������������������������
+2. ��� YYAsyncLayer ���������������������(������)������������������
+3. ������ `YYAsyncLayer.h`���
+
+
+������
+==============
+������������ [CocoaDocs](http://cocoadocs.org/docsets/YYAsyncLayer/) ������������ API ��������������������� [appledoc](https://github.com/tomaz/appledoc) ���������������������
+
+
+������������
+==============
+��������������������� `iOS 6.0` ��� `Xcode 7.0`���
+
+
+���������
+==============
+YYAsyncLayer ������ MIT ��������������������� LICENSE ���������
+
+������������
+==============
+[iOS ���������������������������
+](http://blog.ibireme.com/2015/11/12/smooth_user_interfaces_for_ios/) 
+

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