CODEWITHSUNDEEP
ioscocoa-touchcaanimation
morais
morais

Reputation: 2951

How long is the animation of the transition between views on a UINavigationController?

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.

Upvotes: 20

Views: 20090

Answers (2)

Ashley Mills
Ashley Mills

Reputation: 53171

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

Upvotes: 23

Tomasz Bąk
Tomasz Bąk

Reputation: 6204

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.

Upvotes: 27

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