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POSerious issues with getting touch coordinates
 

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  1. POSerious issues with getting touch coordinates
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    <p>I have a simple application that shows the user an image (in a UIImageView) whereby they touch on a part of the screen and then on the next screen the same image is shown (in a UIImageView) but now has a "signature" overlayed on it. The issue I am having is that it seems that the x,y coordinates returned from the touches do not seem to map properly on the UIImageView on the second screen. </p> <p>For instance when I touch the bottom of the screen I get: X: 157.000000 Y: 358.000000</p> <p>but the bottom of the screen should be 480 ? since my screen dimensions are: SCREEN HEIGHT AND WIDTH AT X: 320.000000 Y: 480.000000. This causes the signature to be placed at a DIFFERENT spot than what the user intended.</p> <p>I use the following code to get my touch coordinates:</p> <pre><code>-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{ NSLog(@"TOUCH HAPPENED"); UITouch *touch = [touches anyObject]; CGPoint touchCoordinates = [touch locationInView:self.view]; NSLog(@"X: %f Y: %f",touchCoordinates.x, touchCoordinates.y); } </code></pre> <p>I am using the following code to place the "signature" with the values I get from the touch:</p> <pre><code>CGRect screenRect = [[UIScreen mainScreen] bounds]; UIGraphicsBeginImageContext(screenRect.size); [pageImage drawInRect:CGRectMake(0, 0, screenRect.size.width, screenRect.size.height)]; // this is the original image NSLog(@"SCREEN HEIGHT AND WIDTH AT X: %f Y: %f",screenRect.size.width, screenRect.size.height); NSLog(@"PLACING IT AT TOUCH COORDINATES X: %f Y: %f",sigLocation.x, sigLocation.y); UIImage *shieldLogo = [UIImage imageNamed:@"shield_bw.gif"]; [shieldLogo drawInRect:CGRectMake(sigLocation.x, sigLocation.y, shieldLogo.size.width/2, shieldLogo.size.height/2)]; [theSignature drawAtPoint:CGPointMake(sigLocation.x+24.000000, sigLocation.y) withFont:[UIFont fontWithName:@"Arial" size:8.0]]; [theSignature2 drawAtPoint:CGPointMake(sigLocation.x+24.000000, sigLocation.y+ 8.000000) withFont:[UIFont fontWithName:@"Arial" size:8.0]]; UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); [image setImage:resultingImage]; </code></pre>
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