UIAnimation causes XCode to crash after time

Question

My app crashes in XCode after idling for about 5-7 minutes. I'm sure it's something to do with the animation used for the loading screen - I pasted the code below.

I tried enabling Zombie Objects to see if it was a call to a released object, and attached screenshots of the debug window when it crashed.

By the way - if I press 'resume' the app continues to function normally..

Edit: this is a first. A global breakpoint I set was stopped on the line [UIView animateWithDuration:0.2... and this is the output code (it hard crashed this time):

XYZ(14098,0xac3eaa28) malloc: *** mmap(size=2097152) failed (error code=12)
*** error: can't allocate region
*** set a breakpoint in malloc_error_break to debug 2013-02-23 13:19:36.653 XYZ[14098:c07] *** Terminating app due to uncaught exception 'NSMallocException', reason: '*** -[NSObject allocWithZone:]: attempt to allocate object of class 'UIViewAnimationState' failed'
*** First throw call stack: (0x1cf3012 0x17e8e7e 0x1d7e1a4 0x17fca6b 0x17fca55 0x3acceb 0x3baeec 0x3bb1a7 0x37785 0x3badf6 0x3add66 0x3adf04 0x10fc7d8 0x196d014 0x195d7d5 0x1c99af5 0x1c98f44 0x1c98e1b 0x28f17e3 0x28f1668 0x36fffc 0x28fd 0x2825) libc++abi.dylib: terminate called throwing an exception

---

- (void)startAnimating
{   
    _isAnimating = YES;
    float rotationAngle = 360.0 / 3;
    [UIView animateWithDuration:0.5
                          delay:0.0
                        options:UIViewAnimationOptionCurveEaseInOut
                     animations:^
    {
        self.marks.transform = CGAffineTransformRotate(self.marks.transform,
                                                       ((rotationAngle + 10) * (M_PI / 180.0)));
//        self.marks.transform = CGAffineTransformMakeRotation((rotationAngle + 10) * (M_PI / 180.0));
    }
                     completion:^(BOOL finished)
    {
        [UIView animateWithDuration:0.2
                              delay:0.0
                            options:UIViewAnimationOptionCurveEaseInOut
                         animations:^
        {
            self.marks.transform = CGAffineTransformRotate(self.marks.transform,
                                                           -10 * (M_PI / 180.0));
//            self.marks.transform = CGAffineTransformMakeRotation(-10 * (M_PI / 180.0));
        }
                         completion:^(BOOL finished)
        {
            self.marks.transform = CGAffineTransformIdentity;
            [self startAnimating];
        }];
    }];
}

The screenshot when it crashed normally:

The screenshot when NSZombieObjects is enabled:

Answer 1

The completion block of your second animation is recursively calling startAnimating. I would think that is the cause of the problem. You should use a loop instead or create a repeating animation.