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

Question

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!

Perhaps you can add an image mask and then get the context from the unmasked region? — tams
– tams, Commented Mar 14, 2012 at 1:53

Pavan Kumar · Accepted Answer · 2012-03-14 05:15:15Z

after getting the screenshot image crop the required part using this

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

FluffulousChimp · Accepted Answer · 2012-03-14 02:00:06Z

Untested suggestion...

 UIGraphicsBeginImageContext(smallView.frame.size); [appDelegate.window.layer renderInContext:UIGraphicsGetCurrentContext()]; CGRect cropRect = UIImage *screenshot = UIGraphicsGetImageFromCurrentImageContext(); CGRectMake(160.0,240.0,smallView.frame.size.width,smallView.frame.size.height); CGImageRef croppedImageRef = CGImageCreateWithImageInRect(screenshot.CGImage,cropRect); UIImage *croppedScreenshot = [UIImage imageWithCGImage:croppedImageRef]; CGImageRelease(croppedImageRef); UIGraphicsEndImageContext();

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