Why, when using a timer, does the object return to its initial position on each iteration?

Question

iOS

Good day.
Please review the following code:

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.myTimer = [NSTimer scheduledTimerWithTimeInterval:4.0f
                                                     target:self
                                                  selector:@selector(create:)
                                                  userInfo:nil
                                                   repeats:YES];
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *Touch = [[event allTouches]anyObject];
    CGPoint location = [Touch locationInView:Touch.view];
    
        if ( (location.x <160)&&(location.y>=496)) {
            [UIView setAnimationDuration:0.1f];
            [UIView setAnimationCurve:UIViewAnimationCurveLinear];
            if (bounce.center.x>20) {bounce.center = CGPointMake(bounce.center.x - 20 , bounce.center.y); }
        }
    
        if ((location.x > 160)&&(location.y>=496)) {
            [UIView setAnimationDuration:0.1f];
            [UIView setAnimationCurve:UIViewAnimationCurveLinear];
            if (bounce.center.x<300) {bounce.center = CGPointMake(bounce.center.x + 20 , bounce.center.y); }
        }
}

-(void)create:(NSTimer*)timer {

    CGRect lab = CGRectMake(0, 0, 70, 50);
    l = [[UIImageView alloc] initWithFrame:lab];
    l.backgroundColor=[UIColor greenColor];
    [self.view addSubview:l];
    
    CGRect lab1 = CGRectMake(110, 0, 320, 50);
    l1 = [[UIImageView alloc] initWithFrame:lab1];
    l1.backgroundColor=[UIColor greenColor];
    [self.view addSubview:l1];
    
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:3.0f];
    [UIView setAnimationCurve:UIViewAnimationCurveLinear];
    l.center = CGPointMake(35 , 600);
    l1.center = CGPointMake(270, 600);
    
}

There is a bounce object - an ordinary ball that can change its position (move to the right or left) depending on the click on the specified areas of the screen.
Next, using the create method, I create some kind of barrier from two UIImageViews, and then make them move synchronously using an intermediate animation.
Without a timer, everything works fine, but I need such a barrier to be created in the specified area every 4 seconds. To be created - is created, and even moves correctly. BUT: after each passed step, the ball with the help of the same intermediate animation tends to the initial position. I understand that changing its position is not transferred to the timer. Tell me, please, how to fix this?
Thank you.

Answer 1

I solved the problem myself. The bounce object was created in IB and set to the initial position, while the barriers and everything else was created programmatically. As a result, when creating and placing a new barrier, I accessed the UIViewController, and therefore the initial position of the bounce. Therefore, when using the timer, the ball returned to its original position.
Everything started working as it should after I removed bounce from IB and created it with code.