app crash when i did animation.

[vikrant-Ios]

@jonathantribouharet when i did animation on event day on this method -(void)calendar:(JTCalendarManager )calendar prepareDayView:(JTCalendarDayView )dayView

I did animation using dispatch_queue

` dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void){

dayView.circleView.backgroundColor = [UIColor colorWithRed: (CGFloat)0/255 green: (CGFloat)163/255 blue: (CGFloat)227/255 alpha: 0.3];

dayView.circleView.transform = CGAffineTransformScale(CGAffineTransformIdentity, 0.0001, 0.0001); sleep(1);

dispatch_async(dispatch_get_main_queue(), ^(void){

            [UIView transitionWithView:dayView
                              duration:.1
                               options:UIViewAnimationOptionCurveEaseIn
                            animations:^{
                                [calendarManager reload];
                                dayView.circleView.backgroundColor = [UIColor colorWithRed: (CGFloat)0/255 green: (CGFloat)163/255 blue: (CGFloat)227/255 alpha: 0.6];
                                dayView.circleView.transform = CGAffineTransformIdentity;
                            } completion:^(BOOL Finished){

                                dayView.circleView.backgroundColor = [UIColor colorWithRed: (CGFloat)0/255 green: (CGFloat)163/255 blue: (CGFloat)227/255 alpha: 1];
                            }];
        });
    });

    dayView.circleView.hidden = NO;
    //dayView.circleView.backgroundColor = skyBlueColour;
    dayView.dotView.backgroundColor = [UIColor whiteColor];
    dayView.textLabel.textColor = [UIColor whiteColor];
    dayView.textLabel.font = [UIFont fontWithName:@"BentonSans-Medium" size:14.0];`

Please help how to do animation on event day