Objective-C iOS Crop Image Using Zoom?

crop, ios, zooming

Solution

I found an answer here that helped me do what I wanted iOS: Cropping a still image grabbed from a UIImagePickerController camera with overlay

Code Snippet for those interested

float zoomScale = 1.0 / [scrollView zoomScale];

CGRect rect;
NSLog(@"contentOffset is :%f,%f",[scrollView contentOffset].x,[scrollView contentOffset].y);
rect.origin.x = fabsf([scrollView contentOffset].x * zoomScale);
rect.origin.y = fabsf([scrollView contentOffset].y * zoomScale);
rect.size.width = fabsf([scrollView bounds].size.width * zoomScale);
rect.size.height = fabsf([scrollView bounds].size.height * zoomScale);

UIGraphicsBeginImageContextWithOptions( CGSizeMake( rect.size.width,
                                                   rect.size.height),
                                       NO,
                                       0.);
[[imageView image] drawAtPoint:CGPointMake( -rect.origin.x, -rect.origin.y)
            blendMode:kCGBlendModeCopy
                alpha:1.];
UIImage *croppedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

Problem

I am trying to use this code to allow users to zoom and crop their images in my app: https://github.com/iosdeveloper/ImageCropper/tree/master/Classes/ImageCropper code snippet ``` float zoomScale = 1.0 / [scrollView zoomScale]; CGRect rect; rect.origin.x = [scrollView contentOffset].x * zoomScale; rect.origin.y = [scrollView contentOffset].y * zoomScale; rect.size.width = [scrollView bounds].size.width * zoomScale; rect.size.height = [scrollView bounds].size.height * zoomScale; CGImageRef cr = CGImageCreateWithImageInRect([[imageView image] CGImage], rect); UIImage *cropped = [UIImage imageWithCGImage:cr]; CGImageRelease(cr); [delegate imageCropper:self didFinishCroppingWithImage:cropped]; ``` But it does not take into account images being rotated (I guess it's some sort of metadata on the iPhone images). I do not want to have users draw a rectangle to crop as I much prefer this interface. Can someone tell me how to make it not rotate my images? I am building in iOS 5 & 6 if that helps. [EDIT] Also, this is done nicely in the Game Center application for uploading your profile picture. Anyone know where I can find the code for that?

Original source

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