Removing subviews from a view by tag.

subviewtag.m

// Each UIView object has a tag property which is simply an integer value 
// that can be used to identify that view. You could set the tag value of 
// each added view to 7 like this. The use the for loop to clean up the
// subview if needed.

    UITouch *touch = [touches anyObject];
    CGPoint touchPoint = [touch locationInView:self.view];
    CGRect myImageRect = CGRectMake((touchPoint.x -50), (touchPoint.y -50), 80.0f, 90.0f); 
    UIImageView *myImage = [[UIImageView alloc] initWithFrame:myImageRect];

    [myImage setImage:[UIImage imageNamed:@"button"]];
     myImage.opaque = YES; // explicitly opaque for performance
     myImage.tag = 999;
    
    ....
    
    // Clear the subview by tag 999.
    for (UIView *subview in [self.view subviews]) {
        if (subview.tag == 999) {
            [subview removeFromSuperview];
        }
    }