Capturing Default iOS Keyboard Rect & Image

gistfile1.m

	anImageView.image = ((^ (CGRect *outKeyboardRect){
	
		[CATransaction begin];

		UIWindow *tempWindow = [[[UIWindow alloc] initWithFrame:[UIScreen mainScreen].applicationFrame] autorelease];
		[tempWindow makeKeyAndVisible];
		
		UITextField *fauxTextField = [[[UITextField alloc] initWithFrame:(CGRect){ 0, 0, 128, 128 }] autorelease];
		[tempWindow addSubview:fauxTextField];
		fauxTextField.alpha = 0;
		
		NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
		
		__block NSNotification *nrKeyboardDidShowNotification = nil;
		__block id nrKeyboardDidShowNotificationListener = [center addObserverForName:UIKeyboardDidShowNotification object:nil queue:nil usingBlock:^(NSNotification *note) {
			nrKeyboardDidShowNotification = [note retain];
			[center removeObserver:nrKeyboardDidShowNotificationListener];
		}];
		
		[fauxTextField becomeFirstResponder];
		
		UIScreen *mainScreen = [UIScreen mainScreen];
		
		UIGraphicsBeginImageContextWithOptions(mainScreen.bounds.size, YES, mainScreen.scale);
		CGContextRef context = UIGraphicsGetCurrentContext();
		
		for (UIWindow *aWindow in [UIApplication sharedApplication].windows)
		if (aWindow.screen == mainScreen)
		if (aWindow != tempWindow)
			[aWindow.layer renderInContext:context];
		
		UIImage *fullScreenImage = UIGraphicsGetImageFromCurrentImageContext();
		UIGraphicsEndImageContext();
		
		[fauxTextField resignFirstResponder];
		[fauxTextField removeFromSuperview];

		[CATransaction commit];
		
		[nrKeyboardDidShowNotification autorelease];
		
		if (!nrKeyboardDidShowNotification)
			return nil;			
		
		NSValue *keyboardRectValue = [[nrKeyboardDidShowNotification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey];
		if (!keyboardRectValue)
			return nil;
		
		CGRect keyboardRect = [keyboardRectValue CGRectValue];
		CGImageRef fullScreenImageRef = fullScreenImage.CGImage;
		
		CGRect (^scaledRect)(CGRect, CGFloat) = ^ (CGRect aRect, CGFloat scale) {
			return (CGRect) {
				aRect.origin.x * scale,
				aRect.origin.y * scale,
				aRect.size.width * scale,
				aRect.size.height * scale			
			};
		}; 
		
		CGRect scaledKeyboardRect = scaledRect(keyboardRect, mainScreen.scale);
		
		CGImageRef keyboardImageRef = CGImageCreateWithImageInRect(fullScreenImageRef, scaledKeyboardRect);
		if (!keyboardImageRef)
			return nil;
		
		UIImage *keyboardImage = [UIImage imageWithCGImage:keyboardImageRef scale:mainScreen.scale orientation:UIImageOrientationUp];
		CGImageRelease(keyboardImageRef);
		
		if (outKeyboardRect)
			*outKeyboardRect = keyboardRect;
		
		return keyboardImage;
	
	})(&keyboardRect));