How to let a view rotate forever?

Question

Is there a way to let a view rotate forever, with an specified speed? I need that for an indicator kind of thing. I know there is this weird Lxxxxx00ff constant (don\'t reme

Answer 1

my solution for this is a bit hacky since it doesn't use core animation but at least it works truly forever and doesn't require you to setup multiple animation steps.

...
// runs at 25 fps
NSTimer* timer = [NSTimer scheduledTimerWithTimeInterval:1.0/25
                          target:self
                          selector:@selector(rotate)
                          userInfo:nil
                          repeats:YES];
[timer fire];
...

- (void)rotate {
    static int rotation = 0;

    // assuming one whole rotation per second
    rotation += 360.0 / 25.0;
    if (rotation > 360.0) {
        rotation -= 360.0;
    }
    animatedView.transform = CGAffineTransformMakeRotation(rotation * M_PI / 180.0);
}