grabbing an UIImage from a UITextView or UILabel gives white rect

oldmicah · 03-13-2010, 06:19 AM

Hello all,

I need to grab an UIImage from a UITextView or UILabel. I've got a method that will pull an image successfully from other types of views ( [UIViewController view], MKMapView, UIButtons) but I am just getting a white rect for my UITextView.

I've been banging my head against the wall for a while and suspect something really, really basic.

many thanks!

Code:

@interface TaskAccomplishmentViewController : UIViewController {
	
    MKMapView *mapView;
	UILabel *timeLeftText;
	UITextView *challengeText;
	
	UIButton *successButton;

<snip>

-(void) setChallangeImageToImageFromChallenge {
	
	//  works
//	[currChallenge setChallengeImage:[UIImageUtils grabImageFromView:mapView]];
//	[currChallenge setChallengeImage:[UIImageUtils grabImageFromView:[self view]]];
//	[currChallenge setChallengeImage:[UIImageUtils grabImageFromView:successButton]];
	
	//doesn't work
//	[currChallenge setChallengeImage:[UIImageUtils grabImageFromView:timeLeftText]];
	[currChallenge setChallengeImage:[UIImageUtils grabImageFromView:challengeText]];
	
}

and the grabImageFrom a view code

Code:

+(UIImage *)grabImageFromView: (UIView *) viewToGrab {
	
	UIGraphicsBeginImageContext(viewToGrab.bounds.size);
	
	[[viewToGrab layer] renderInContext:UIGraphicsGetCurrentContext()];
	UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
	UIGraphicsEndImageContext();
	return viewImage;
}

oldmicah · 03-13-2010, 01:42 PM

I've been working under the theory that I'm actually grabbing the scrolling view, not the underlying text view, but I haven't found any way of grabbing it. If such a thing is feasible, is there a way to grab the under layer from UITextView?

thanks again!