将UIImageView的图像按比例缩放为填充模式

Question

I have one UIImageView which is in scale to fill mode. Now i want to crop the image in imageview. I have one rectangle on this imageview which user can move and change the size. After particular size is selected i want to crop the image using this frame. But since my mode of uiimageview is scale to fill this messes the cropping rectangle and different part is cropped. Has any one faced this problem. How to crop properly ?

Answer 1

Your options are to calculate, or use this walkaround:

-(UIImage *)imageFromImageView:(UIImageView *)view withCropRect:(CGRect)cropRect
{
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, 0.0);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage * largeImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

CGImageRef imageRef = CGImageCreateWithImageInRect([largeImage CGImage], cropRect);
UIImage* img = UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
    return img;
}