Find out the animation duration of the current animation block

Question

Inside a UIView animation block, is there a way to get the current animation's duration?

[UIView animateWithDuration:1.0 animations:^{
    // float duration = ?
}];

I'm not sure I understand what you mean, wouldn't the animation duration be 1.0? — Mick MacCallum, Apr 05 '12 at 08:14
yes, but I'm using a component inside the block that needs to know the duration, and I don't want to pass the duration as a variable — adamsiton, Apr 05 '12 at 08:16
I don't think it is possible without a variable... Is there a particular reason for not using it? — Giuseppe Garassino, Apr 05 '12 at 09:36

score 5 · Answer 1 · answered Oct 22 '19 at 11:33

5

If you are targeting iOS 9.0 or later, then you are looking for a class property of UIView, called inheritedAnimationDuration.

Usage:

let currentAnimationDuration = UIView.inheritedAnimationDuration

From Apple docs:

Summary

Returns the inherited duration of the current animation.

Discussion

This method only returns a non-zero value if called within a UIView animation block.

answered Oct 22 '19 at 11:33

Dennis Pashkov

934
10
24

Thanks it saves a lot of my time – Amir Ehsanijam Jun 22 '20 at 16:23

score 3 · Answer 2 · edited Jul 16 '20 at 08:54

TL;DR: use CALayer -actionForKey:, not -animationForKey:

@Dimitri Bouniol 's answer didn't work for me when called from an an affected setter inside an animation block. The reason, from my understanding, is that UIView's animation system sets up state before starting the actual animation (and calls setters before starting the actual animation). What worked for me though was calling the similar -actionForKey: method on the layer. The action returned did have the proper duration set, and can be used as it is in his answer.

CAAnimation *animation = (CAAnimation *)[self.layer actionForKey@"position"]; // or property of interest

[CATransaction begin];
[CATransaction setAnimationDuration:animation.duration];
[CATransaction setAnimationTimingFunction:animation.timingFunction];

// CALayer animation here

[CATransaction commit];

Doesn't work in iOS 11. `actionForKey:` returns a `_UIViewAdditiveAnimationAction` that conforms to the `CAAction` protocol but is not a `CAAnimation`. So the `timingFunction` property doesn't exist. @Dimitri Bouniol's answer works for me. — Ortwin Gentz, Apr 24 '18 at 11:35

score 1 · Answer 3 · answered Sep 24 '12 at 14:34

1

[CATransaction animationDuration] is what you're looking for

answered Sep 24 '12 at 14:34

Nick Dowell

2,030
17
17

1

Unfortunately that doesn't work, the UIView animation block apparently doesn't work directly with CATransaction. – Patrick Pijnappel Oct 22 '13 at 04:32

score 0 · Answer 4 · answered Apr 13 '12 at 19:28

0

Since you're using blocks, why not just capture a variable with it?

CGFloat duration = 1.0;
[UIView animateWithDuration:duration animations:^{ 
    CGFloat theDuration = duration; 
}];

answered Apr 13 '12 at 19:28

Rollin_s

1,983
2
18
18

Agree. We already passing duration then why should we find another way for that. – Mrug Apr 11 '14 at 11:51

score 0 · Answer 5 · answered Apr 10 '14 at 05:10

You can get the current animation easily enough. For instance, setting up a CATransaction:

CAAnimation *animation = [self.layer animationForKey:self.layer.animationKeys.firstObject];
[CATransaction begin];
[CATransaction setAnimationDuration:animation.duration];
[CATransaction setAnimationTimingFunction:animation.timingFunction];

// CALayer animation here

[CATransaction commit];

Find out the animation duration of the current animation block

5 Answers5