目前多數(shù)的直播播放是使用openGLES來實現(xiàn)的勋眯，使用常用的
UIWindow *mainWindow = [UIApplication sharedApplication].keyWindow;
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextFillRect(context, bounds);
CGContextTranslateCTM(context, shrinkSize.width, shrinkSize.height);
[mainWindow.layer renderInContext:context];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
不能截取播放器播放的畫面吨述，只能截取到一塊黑屏
目前使用下面的方法可以直接截取
UIWindow *mainWindow = [UIApplication sharedApplication].keyWindow;
UIGraphicsBeginImageContextWithOptions(mainWindow.frame.size, NO, 0);
[mainWindow drawViewHierarchyInRect:mainWindow.frame afterScreenUpdates:YES];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
