Capture some of the iphone screen

Question

i am using this code to capture my screen.

        CGImageRef screen = UIGetScreenImage();
    UIImage* image = [UIImage imageWithCGImage:screen];
    CGImageRelease(screen);
    UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);

this code take all of the screen. i need only some of it... CGRect rect = CGRectMake (0,0,100,100);

can i pass any parameter to get it?

thanks!

Diwann · Answer 1 · 2012-03-27T13:05:49.650

you can also define a new context for the rect size you want :

CGRect rect = CGRectMake (0,0,100,100);
UIGraphicsBeginImageContext(rect);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *screenshot = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(screenshot, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);

Nota : you need to add QuartzCore in import :

#import <QuartzCore/QuartzCore.h>

and you can get main view with :

UIView *view = [[UIApplication sharedApplication].keyWindow rootViewController].view

Grabbing the highest level view like this was very helpful, thanks! — Billy Lazzaro, Mar 13 '14 at 18:44

score 1 · Answer 2 · edited May 23 '17 at 10:24

1

Sounds like you simply want or need to crop your UIImage.

Check out the code in this related question and see if it helps you out:

How to crop the UIImage?

edited May 23 '17 at 10:24

Community

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answered Mar 27 '12 at 12:53

Michael Dautermann

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it is not possible to get the uiimage at certain size? – OAZ Mar 27 '12 at 12:55

score 1 · Answer 3 · answered Mar 27 '12 at 13:25

Use this code to capture screen and automatically saved to Image library in iphone device.

 UIGraphicsBeginImageContext(self.view.frame.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);

Capture some of the iphone screen

3 Answers3