How to take a screenshot programmatically on iOS

Question

I want a screenshot of the image on the screen saved into the saved photo library.

Answer 1

Just a small contribution, I've done this with a button but the pressing also means the button is captured pressed. So first I unhighlight.

- (IBAction)screenShot:(id)sender {
    // Unpress screen shot button
    screenShotButton.highlighted = NO;

    // create graphics context with screen size
    CGRect screenRect = [[UIScreen mainScreen] bounds];

    if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) {
        UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, NO, [UIScreen mainScreen].scale);
    } else {
        UIGraphicsBeginImageContext(self.view.bounds.size);
    }

    CGContextRef ctx = UIGraphicsGetCurrentContext();
    [[UIColor blackColor] set];
    CGContextFillRect(ctx, screenRect);

    // grab reference to our window
    UIWindow *window = [UIApplication sharedApplication].keyWindow;

    // transfer content into our context
    [window.layer renderInContext:ctx];
    UIImage *screengrab = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    // save screengrab to Camera Roll
    UIImageWriteToSavedPhotosAlbum(screengrab, nil, nil, nil);
}

I got the main body of the code from: http://pinkstone.co.uk/how-to-take-a-screeshot-in-ios-programmatically/ where I used option 1, option 2 didn't seem to work for me. Added the adjustments for Rentina screen sizes from this thread, and the unhighlighting of the screenShotButton. The view I'm using it on is a StoryBoarded screen of buttons and labels and with several UIView added later via the program.

Answer 2

IN SWIFT

func captureScreen() -> UIImage
{

    UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, false, 0);

    self.view.drawViewHierarchyInRect(view.bounds, afterScreenUpdates: true)

    let image: UIImage = UIGraphicsGetImageFromCurrentImageContext()

    UIGraphicsEndImageContext()

    return image
}