20

Ideally, there would be some kind of constant containing this value.

I'm implementing code that has it's own transition animations, and I'd like those to have the same length as the platform transition animations.

morais
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2 Answers2

27

In iOS 7 and later you can have exact value by setting the UINavigationController delegate and using the method:

- (void)navigationController:(UINavigationController *)navigationController
      willShowViewController:(UIViewController *)viewController
                    animated:(BOOL)animated {
    NSTimeInterval duration = [viewController.transitionCoordinator transitionDuration];
}

This is future proof method if the defult duration will ever change. At the moment it's value is 0.35 second.

Tomasz Bąk
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23

There's no constant containing this value. However, using the following UINavigationControllerDelegate methods:

- (void) navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    startTime = [[NSDate date] retain];
}

- (void) navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    NSLog(@"Duration %f", [[NSDate date] timeIntervalSinceDate: startTime]);
}

... I can see that the duration is approx 0.35 seconds

Interestingly, different parts of the views take different times to transition into place. See this great blog post for more details:

http://www.iclarified.com/12396/a-closer-look-at-iphone-transition-animations

DrMickeyLauer
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Ashley Mills
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    On iOS 8 the animation duration appears to be `0.2` seconds. (There is now a constant you can refer to:`UINavigationControllerHideShowBarDuration`.) – zekel Oct 08 '14 at 16:49
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    This comment should be an answer, it's helped me many many times – fpg1503 Sep 10 '15 at 18:23
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    This constant only applies to the animation of navigation BARS, not the viewController views themselves. – Ben Gottlieb Nov 28 '16 at 19:42
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    The timing of `UINavigationController.hideShowBarDuration` appears to be faster than the push/pop animation. – Bryan Bryce May 26 '20 at 18:37