拍摄UIWebView的快照/截图

如何拍摄UIWebView控件的快照/屏幕截图？

接受的答案是正确的,但屏幕截图不是视网膜分辨率.使用UIGraphicsBeginImageContextWithOptions和设置其缩放参数0.0f使其以原始分辨率捕获.

UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
CGRect rect = [keyWindow bounds];
UIGraphicsBeginImageContextWithOptions(rect.size,YES,0.0f);
CGContextRef context = UIGraphicsGetCurrentContext();
[keyWindow.layer renderInContext:context];   
UIImage *capturedScreen = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();