Animation of menuitem's view appear flash

Question

flash animation I set a CalendarViewController's view as menuitem.view, when touch the bottom of menuitem.view, menuitem.view will begin animate, but i found the animation appears flashing. What can i do that make the animation become more smooth.

- (IBAction)respondToTapBottomView:(NSButton *)sender {
NSSize size = self.view.frame.size;
NSLog(@"%@", NSStringFromRect(self.view.window.frame));
[NSAnimationContext runAnimationGroup:^(NSAnimationContext * _Nonnull context) {
    context.duration = 0.5;
    CGFloat height = 10;
    if (self.bottomContentHeightConstraint.constant >= 30) {
        height = 10;
    } else {
        height = 97;
    }
    CGFloat windowHeight = self.calendarView.frame.size.height + height;
    self.view.animator.frame = CGRectMake(0, 0, size.width, windowHeight);
    self.bottomContentHeightConstraint.animator.constant = height;
} completionHandler:^{
    NSLog(@"%@", NSStringFromRect(self.view.window.frame));
}];

}

Answer 1

I gave up using this method, finaly, i work around the problem by draw a custom popoverView rather than use menuItem.view.