IOS : Move an image with a timer

Question

Hi, I have a problem, when I click on a button.

I would a timer which stop my code for several milliseconds to create a fluid's movement.

This is my code :

- (IBAction)goRight:(id)sender {
    sprite.image = [UIImage imageNamed:@"sprite_rr.png"];
    [NSThread sleepForTimeInterval:1];
    sprite.center = CGPointMake(sprite.center.x + 5, sprite.center.y);
    sprite.image = [UIImage imageNamed:@"sprite_lr.png"];
}

But this code patient 30 milliseconds then execute directly without waiting.

Can you help me please ? Thanks

PS : Sorry for my bad English ^^

Answer 1

Try:

- (IBAction)goRight:(id)sender {
    sprite.image = [UIImage imageNamed:@"sprite_rr.png"];
    CGRect frame = sprite.frame;
    frame.origin.x += 5;
    [UIView animateWithDuration:1.0 animations:^{
            [sprite setFrame: frame];
            sprite.image = [UIImage imageNamed:@"sprite_lr.png"];
        }];

}

In order to animate or "move" objects visually, you need to use animateWithDuration: animations: method.

Edit: Try setting the frame instead of modifying the center.