Accessing the current position of UIView during animation

Question

I am trying to find the current position of an iPhone ImageView that is animating across the screen.

I create and animate the imageView like so

-(IBAction)button:(UIButton *)sender{     UIImageView *myImageView =[[UIImageView alloc] initWithImage:                                      [UIImage imageNamed:@"ball.png"]];         myImageView.frame = CGRectMake(0, self.view.frame.size.height/2, 40, 40);         [self.view addSubview:myImageView];     [myArray addObject:myImageView];      [UIView animateWithDuration:.5                            delay:0                  options:(UIViewAnimationOptionAllowUserInteraction) // | something here?)                      animations:^{                          myImageView.frame = CGRectOffset(myImageView.frame, 500, 0);                          }                      completion:^(BOOL finished){                          [myArray removeObject:myImageView];                          [myImageView removeFromSuperview];                          [myImageView release];                      }      ]; } 

then to detect the current CGPoint of the imageView I call this method every 60th of a second

-(void)findPoint{      for (UIImageView *projectile in bullets) {                  label.text = [NSString stringWithFormat:@"%f", projectile.center.x];          label2.text = [NSString stringWithFormat:@"%f", projectile.center.y];     } } 

However this only gives me the point where the animation ends, I want to get the current CGPoint of the image that is animating across the screen. Is there an option that I need to apply other than UIViewAnimationOptionAllowUserInteraction to do this? If not, how do I get the current position of an animating imageView?

Answer 1

You can use the presentationLayer - a property of the CALayer that "provides a close approximation to the version of the layer that is currently being displayed". Just use it like this:

CGRect projectileFrame = [[projectile.layer presentationLayer] frame]; 

Answer 2

Swift 5: Get temporary position and size (CGRect) during the animation with:

let currentFrame = projectileFrame.layer.presentation()!.frame