UIView error shaking animation.

UIViewShakeCategory.m

- (void)shake {
    [self _shake:10 direction:1 currentTimes:0 withDelta:5 speed:0.03 shakeDirection:ShakeDirectionHorizontal completion:nil];
}

- (void)_shake:(int)times direction:(int)direction currentTimes:(int)current withDelta:(CGFloat)delta speed:(NSTimeInterval)interval shakeDirection:(ShakeDirection)shakeDirection completion:(void (^)(void))completionHandler {
    __weak UIView *weakSelf = self;
    [UIView animateWithDuration:interval animations:^{
        weakSelf.layer.affineTransform = (shakeDirection == ShakeDirectionHorizontal) ? CGAffineTransformMakeTranslation(delta * direction, 0) : CGAffineTransformMakeTranslation(0, delta * direction);
    } completion:^(BOOL finished) {
        if(current >= times) {
            [UIView animateWithDuration:interval animations:^{
                weakSelf.layer.affineTransform = CGAffineTransformIdentity;
            } completion:^(BOOL finished){
                if (completionHandler != nil) {
                    completionHandler();
                }
            }];
            return;
        }
        [weakSelf _shake:(times - 1)
               direction:direction * -1
            currentTimes:current + 1
               withDelta:delta
                   speed:interval
          shakeDirection:shakeDirection
              completion:completionHandler];
    }];
}