是否有可能将UIView的特定区域转换为iPhone中的UIImage

Question

我已经完成了将UIView转换为UIImage但我希望将UIView的任何特定部分转换为UIImage，这样才有可能

UIGraphicsBeginImageContext(view.bounds.size);
[view.layer drawInContext:UIGraphicsGetCurrentContext()];
UIImage * img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

Answer 1

尝试这个：

CGImageRef imageRef = CGImageCreateWithImageInRect([theImage CGImage], someRect);
CGFloat width = CGImageGetWidth(imageRef);
CGFloat height = CGImageGetHeight(imageRef);
CGContextDrawImage(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, width, height), imageRef);
UIImage *croppedImage = UIGraphicsGetImageFromCurrentImageContext();

首先，您将从UIView保存原始UIImage ，然后使用上述方法裁剪它。 someRect是原始UIView someRect的矩形区域。

Answer 2

CGImageRef imageRef = CGImageCreateWithImageInRect([theImage CGImage], someRect);
CGFloat width = CGImageGetWidth(imageRef);
CGFloat height = CGImageGetHeight(imageRef);
CGContextDrawImage(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, width, height), imageRef);
UIImage *croppedImage = UIGraphicsGetImageFromCurrentImageContext();
NSData *data= UIImagePNGRepresentation(croppedImage);
UIImage *img = [UIImage imageWithData:data];
UIGraphicsEndImageContext();
return img;