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    <p>Transforms are not accumulative e.g. each transform operates on the original matrix and not the matrix returned by the last transform. That is why you <code>image1</code> object transform once and then stays there. It is the exact same transform starting at the beginning over and over again. </p> <p>Instead of trying to accumulate or sum the transforms, you need to accumulate or sum the <code>scale</code> variable. Make the <code>scale</code> variable a property of the controller object that holds the method and then progressively increment the value to make <code>image1</code> larger.</p> <p>Something like:</p> <pre><code>-(void)collision { if(CGRectIntersectsRect(imageView.frame,centre.frame)){ self.scale=self.scale+1; // scale is no longer a local value and will increment imageView.alpha=0.5; [imageView removeFromSuperview]; [UIView beginAnimations:nil context:nil]; [UIView setAnimationDuration:1.0f]; centre.transform = CGAffineTransformScale(centre.transform, scale, scale); [UIView commitAnimations]; } } </code></pre> <h2>Update:</h2> <p>To convert a local variable i.e. one defined in a single method, you move the definition to header (.h) file like so:</p> <pre><code>@implementation MyViewController:NSViewController{ //... various definitions } @property NSInteger *scale; </code></pre> <p>... then in the implementation file (.m) add the synthesize directive:</p> <pre><code>@synthesize scale; </code></pre> <p>Now you can use <code>self.scale</code> to refer to <code>scale</code> property anywhere in the class and it will be preserved. Each time you call:</p> <pre><code>self.scale=self.scale + 1; </code></pre> <p>... the value will increment and will be saved so that it is available for the next collision. </p> <p>Each time you call <code>collision</code> the scale value will change by one e.g.</p> <pre><code>centre.transform = CGAffineTransformScale(centre.transform, 1, 1); ... centre.transform = CGAffineTransformScale(centre.transform, 2, 2); .... centre.transform = CGAffineTransformScale(centre.transform, 3, 3); //... and so on </code></pre> <p>... the <code>CGAffineTransformScale</code> will increasing transform the imageview to a large size.</p>
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    1. POHow to Make UIImageView Framesize Larger Following Collision Detection
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    1. COI don't really understand " Make the scale variable a property of the controller object that holds the method" can you explain please ?
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    2. COplease help me !
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    3. COthere is a big problem : when centre collide with imageView, in one second imageView grows up exponetionaly very quickly and disappear
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