ios编程：iPhone How-to:给UIView拍照-优快云博客

本文详细介绍如何使用Objective-C为UIView全局及局部区域截图。通过利用UIView的layer属性与UIGraphicsBeginImageContext等函数，实现对视图进行拍照并转换为UIImage格式，适用于iOS应用开发中的屏幕快照需求。

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ios编程：iPhone How-to:给UIView拍照

时间:2011-04-22 csdn博客林家男孩

基本原理就是主要将UIView的layer描绘到图形上下文。UIView全局拍照和局域拍照的代码如下：

1 UIView全局拍照

- (UIImage *) screenImage:(UIView *)view { UIImage *screenImage; UIGraphicsBeginImageContext(view.frame.size); [view.layer renderInContext:UIGraphicsGetCurrentContext()]; screenImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return screenImage; }

2 UIView局域拍照

- (UIImage *) screenImage:(UIView *)view rect:(CGRect)rect { CGPoint pt = rect.origin; UIImage *screenImage; UIGraphicsBeginImageContext(rect.size); CGContextRef context = UIGraphicsGetCurrentContext(); CGContextConcatCTM(context, CGAffineTransformMakeTranslation(-(int)pt.x, -(int)pt.y)); [view.layer renderInContext:context]; screenImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return screenImage; }

来源：http://blog.youkuaiyun.com/lbj05/archive/2011/04/02/6297209.aspx

转载于:https://www.cnblogs.com/iphone520/archive/2012/04/26/2471439.html