iOS 截屏+裁剪

//截屏

UIGraphicsBeginImageContextWithOptions(ScreenSize,NO, 2);

[self.view.layerrenderInContext:UIGraphicsGetCurrentContext()];

UIImage *image= UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

//裁剪

UIGraphicsBeginImageContext(CGSizeMake(image.size.width, image.size.height-20));

[image drawInRect:CGRectMake(0, -20, image.size.width, image.size.height)];

image= UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();