title: Serious issues with getting touch coordinates
body: <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>