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POHow to Unerase the erased UIImage
 

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  1. POHow to Unerase the erased UIImage
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    <p>Hi Guys I am trying a Image erasing code in my PanGesture I am using code below:</p> <pre><code> UIImage * image = [UIImage imageNamed:@"326d4fb72362a2e44659141cadfc4977.jpg"]; holderView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 235)]; imgForeground = [[UIImageView alloc] initWithFrame:[holderView frame]]; [imgForeground setImage:image]; [holderView addSubview:imgForeground]; UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(move:)]; [panRecognizer setMinimumNumberOfTouches:1]; [panRecognizer setMaximumNumberOfTouches:1]; [panRecognizer setDelegate:self]; [holderView addGestureRecognizer:panRecognizer]; [self.view addSubview:holderView]; </code></pre> <p>Then I am handling this here</p> <pre><code> -(void)move:(id)sender { CGPoint currentPoint; if([(UIPanGestureRecognizer*)sender state] == UIGestureRecognizerStateBegan){ lastPoint = [sender locationInView:imgForeground]; lastPoint.y -=20; } else{ currentPoint = [sender locationInView:imgForeground];; currentPoint.y -=20; } UIGraphicsBeginImageContext(imgForeground.frame.size); [imgForeground.image drawInRect:CGRectMake(imgForeground.frame.origin.x, imgForeground.frame.origin.y, imgForeground.frame.size.width, imgForeground.frame.size.height)]; CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetLineCap(context,kCGLineCapRound); //kCGImageAlphaPremultipliedLast); CGContextSetLineWidth(context, 10); CGContextSetRGBStrokeColor(context, 0, 0, 0, 1.0); CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeClear); CGContextBeginPath(context); CGContextMoveToPoint(context, lastPoint.x, lastPoint.y); CGContextAddLineToPoint(context, lastPoint.x, lastPoint.y); CGContextStrokePath(context); imgForeground.image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); } </code></pre> <p><strong>My Question is How to Unerase the same Image Please Help</strong></p>
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    1. USShashank Kulshrestha
    1. USShashank Kulshrestha
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    1. COIs there a reason why you are building the image with an image context? This doesn't exactly solve your question but I would put my image in a scrollview. A scrollview would automatically give you scrolling if the image size is larger than viewable area.
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      1. USpropstm
    2. COI guess your not getting my question I am erasing the image not scrolling the image. Means when I move my finger upon image it will be removed
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      1. POHow to Unerase the erased UIImage
      1. USShashank Kulshrestha
    3. COWhen you say "unerase" do you mean undo? And if so, do you need multiple levels of undo (and I suppose redo)?
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