CALayer removeAnimationForKey: throws CABasicAnimation length: unrecognized selector sent to instance [closed]

Question

Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers.

---

This question was caused by a typo or a problem that can no longer be reproduced. While similar questions may be on-topic here, this one was resolved in a way less likely to help future readers.

Closed 8 years ago.

Improve this question

I have a category on CALayer that adds and removes animations. I have a rotation animation that works perfectly and I have an -endRotating method. Here is how I've implemented it:

CAAnimation *anim = [self animationForKey:ROTATION_KEY];
if(anim){
    [self removeAnimationForKey:anim];
}

anim is an instance of CABasicAnimation in the method, which is correct. However, [self removeAnimationForKey:anim]; causes an unrecognized selector to be sent to my animation instance:

-[CABasicAnimation length]: unrecognized selector sent to instance 0xba2bf40

Is this a bug in UIKit, or am I doing something wrong?

Here is my animation for reference:

-(void)beginRotatingWithAngularVelocity:(float)velocity{
    CABasicAnimation *rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
    rotationAnimation.fillMode = kCAFillModeForwards;
    rotationAnimation.removedOnCompletion = YES;
    rotationAnimation.repeatCount = 999999;
    rotationAnimation.duration = velocity;
    rotationAnimation.cumulative = YES;
    rotationAnimation.fromValue = [NSNumber numberWithFloat:0];
    rotationAnimation.toValue = [NSNumber numberWithFloat:M_PI * 2];
    [self addAnimation:rotationAnimation forKey:ROTATION_KEY];
}

Why is remove method trying to access length of my animation?

Answer 1

Here's the signature of removeAnimationForKey:

- (void)removeAnimationForKey:(NSString *)key

As you can see it expects an NSString object (in your case probably ROTATION_KEY), not a CAAnimation.