iphone - 是否可以将 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 的操作，但我希望将 UIView 的任何特定部分转换为 UIImage 以便有可能

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();

您首先将从中保存原件UIImage，UIView然后使用上述方法对其进行裁剪。someRect是您想要的原始矩形区域UIView。

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;