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iphoneobjective-ciosuiviewscreenshot

How to take a screenshot of a part of an app's window?

I'm trying to save a screenshot of a part of the screen with all views and layers merged. The only way I know how to do this is with the code below.

The code below creates an 80x80 square, but with a top left corner at 0,0.

How can I cut a smaller rectangle out of a full page screenshot? For example I have a 320x480 full window screenshot, but I only need an 80x80 square centered at 160,240?

UIGraphicsBeginImageContext(smallView.frame.size);
[appDelegate.window.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *screenshot = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

Thank you!

Solution

  • after getting the screenshot image crop the required part using this

    CGImageRef imageRef = CGImageCreateWithImageInRect([screenshot CGImage], cropRect);
UIImage *result = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);