Cancel a UIView animation

Question

Is it possible to cancel a UIView animation while it is in progress  Or would I have to drop to the CA level   i e  I ve done something like this  maybe setting an end animation action too     UIView beginAnimations nil context NULL    UIView setAnimationDuration duration    UIView setAnimationCurve  UIViewAnimationCurveLinear      other animation properties     set view properties   UIView commitAnimations     But before the animation completes and I get the animation ended event  I want to cancel it  cut it short   Is this possible  Googling around finds a few people asking the same question with no answers - and one or two people speculating that it can t be done

User · Answer

Swift version of Stephen Darlington s solution  UIView beginAnimations nil  context  nil  UIView setAnimationBeginsFromCurrentState true  UIView setAnimationDuration 0 1     other animation properties     set view properties UIView commitAnimations

User · Answer

If you are animating a constraint by changing the constant instead of a view property none of the other methods work on iOS 8   Example animation   self constraint constant   0   self view updateConstraintsIfNeeded    self view layoutIfNeeded    UIView animateWithDuration 1 0f                       delay 0 0f                     options UIViewAnimationOptionCurveLinear                  animations                         self constraint constant   1 0f                        self view layoutIfNeeded                      completion   BOOL finished                            Solution   You need to remove the animations from the layers of any views being affected by the constraint change and their sublayers    self constraintView layer removeAllAnimations   for  CALayer  l in self constraintView layer sublayers         l removeAllAnimations

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CALayer   pLayer   self layer presentationLayer   UIView setAnimationBeginsFromCurrentState YES    UIView animateWithDuration 0 001 animations        self frame   pLayer frame

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Sorry to resurrect this answer  but in iOS 10 things kinda changed  and now cancelling is possible and you can even cancel gracefully   After iOS 10 you can cancel animations with UIViewPropertyAnimator   UIViewPropertyAnimator duration  2  dampingRatio  0 4  animations        view backgroundColor    blue    animator stopAnimation true    If you pass true it cancels the animation and it stops right where you cancelled it  The completion method will not be called  However  if you pass false you are responsible for finishing the animation   animator finishAnimation  start    You can finish your animation and stay in the current state   current  or go to the initial state   start  or to the end state   end   By the way  you can even pause and restart later     animator pauseAnimation   animator startAnimation     Note  If you don t want an abrupt cancelling you can reverse your animation or even change your animation after you pause it

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UIView setAnimationsEnabled NO      your code here  UIView setAnimationsEnabled YES

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If you just want to pause stop animation smoothly  self yourView layer speed   0    Source  How to pause the animation of a layer tree

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I have the same problem  the APIs don t have anything to cancel some specific animation  The      void setAnimationsEnabled  BOOL enabled  disables ALL animations  and thus does not work for me  There s two solutions   1  make your animated object a subview  Then  when you want to cancel the animations for that view  remove the view or hide it  Very simple  but you need to recreate the subview without animations if you need to keep it in view   2  repeat the anim only one  and make a delegate selector to restart the anim if needed  like this   - void  startAnimation   NSLog   startAnim alpha  f   self alpha    self setAlpha 1 0    UIView beginAnimations nil context nil    UIView setAnimationDuration 1 0    UIView setAnimationRepeatCount 1    UIView setAnimationRepeatAutoreverses YES    UIView setAnimationDelegate self    UIView setAnimationDidStopSelector  selector pulseAnimationDidStop finished context      self setAlpha 0 1    UIView commitAnimations      -  void pulseAnimationDidStop  NSString   animationID finished  NSNumber   finished context  void   context   if hasFocus         self startAnimation     else       self alpha   1 0       - void  setHasFocus  BOOL  hasFocus   hasFocus    hasFocus  if hasFocus         self startAnimation         Problem with 2  is that there s always delay stopping the anim as it finishes the current animation cycle   Hope this helps

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When I work with UIStackView animation  besides removeAllAnimations   I need to set some values to initial one because removeAllAnimations   can set them to unpredictable state  I have stackView with view1 and view2 inside  and one view should be visible and one hidden   public func configureStackView hideView1  Bool  hideView2  Bool        let oldHideView1   view1 isHidden     let oldHideView2   view2 isHidden     view1 layer removeAllAnimations       view2 layer removeAllAnimations       view layer removeAllAnimations       stackView layer removeAllAnimations          after stopping animation the values are unpredictable  so set values to old     view1 isHidden   oldHideView1        lt - Solution is here     view2 isHidden   oldHideView2        lt - Solution is here      UIView animate withDuration  0 3                     delay  0 0                     usingSpringWithDamping  0 9                     initialSpringVelocity  1                     options                         animations                        view1 isHidden   hideView1                     view2 isHidden   hideView2                     stackView layoutIfNeeded                             completion  nil

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Simplest way to stop all animations on a particular view  immediately  is this   Link the project to QuartzCore framework  At the start of your code    import  lt QuartzCore QuartzCore h gt    Now  when you want to stop all animations on a view dead in their tracks  say this    CATransaction begin    theView layer removeAllAnimations    CATransaction commit     The middle line would work all by itself  but there s a delay until the runloop finishes  the  redraw moment    To prevent that delay  wrap the command in an explicit transaction block as shown  This works provided no other changes have been performed on this layer in the current runloop

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To pause an animation without reverting state to original or final   CFTimeInterval paused time    myView layer convertTime CACurrentMediaTime   fromLayer nil   myView layer speed   0 0  myView layer timeOffset   paused time

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None of the answered solutions worked for me  I solved my issues this way  I do not know if it is a correct way    because I had problems when calling this too-fast  when previous animation was not yet finished   I pass my wanted animation with customAnim block   extension UIView        func niceCustomTranstion          duration  CGFloat   0 3          options  UIView AnimationOptions    transitionCrossDissolve          customAnim   escaping    - gt  Void                         UIView transition              with  self              duration  TimeInterval duration               options  options              animations                    customAnim                          completion     finished  in                 if  finished                                          NOTE  This fixes possible flickering ON FAST TAPPINGS                        NOTE  This fixes possible flickering ON FAST TAPPINGS                        NOTE  This fixes possible flickering ON FAST TAPPINGS                     self layer removeAllAnimations                       customAnim

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Even if you cancel the animation in the ways above animation didStopSelector still runs  So if you have logic states in your application driven by animations you will have problems  For this reason with the ways described above I use the context variable of UIView animations  If you pass the current state of your program by the context param to the animation  when the animation stops your didStopSelector function may decide if it should do something or just return based on the current state and the state value passed as context

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Use    import  lt QuartzCore QuartzCore h gt             myView layer removeAllAnimations

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On iOS 4 and greater  use the UIViewAnimationOptionBeginFromCurrentState option on the second animation to cut the first animation short   As an example  assume you have a view with an activity indicator   You wish to fade in the activity indicator while some potentially time consuming activity begins  and fade it out when the activity is finished   In the code below  the view with the activity indicator on it is called activityView   -  void showActivityIndicator       activityView alpha   0 0      activityView hidden   NO       UIView animateWithDuration 0 5                  animations   void                         activityView alpha   1 0                        -  void hideActivityIndicator        UIView animateWithDuration 0 5                  delay 0 options UIViewAnimationOptionBeginFromCurrentState                  animations   void                         activityView alpha   0 0                                      completion   BOOL completed                         if  completed                             activityView hidden   YES

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The way I do it is to create a new animation to your end point  Set a very short duration and make sure you use the  setAnimationBeginsFromCurrentState  method to start from the current state  When you set it to YES  the current animation is cut short  Looks something like this    UIView beginAnimations nil context NULL    UIView setAnimationBeginsFromCurrentState YES    UIView setAnimationDuration 0 1    UIView setAnimationCurve  UIViewAnimationCurveLinear      other animation properties     set view properties   UIView commitAnimations

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To cancel an animation you simply need to set the property that is currently being animated  outside of the UIView animation  That will stop the animation wherever it is  and the UIView will jump to the setting you just defined

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None of the above solved it for me  but this helped  The UIView animation sets the property immediately  then animates it  It stops the animation when the presentation layer matches the model  the set property    I solved my issue  which was  I want to animate from where you look like you appear    you  meaning the view   If you want THAT  then    Add QuartzCore  CALayer   pLayer   theView layer presentationLayer    set the position to the presentation layer  I use a few options including UIViewAnimationOptionOverrideInheritedDuration  But because Apple s documentation is vague  I don t know if it really overrides the other animations when used  or just resets timers     UIView animateWithDuration blah                         options  UIViewAnimationOptionBeginFromCurrentState                          animations                                         theView center   CGPointMake  pLayer position x   YOUR ANIMATION OFFSET  pLayer position y   ANOTHER ANIMATION OFFSET                        this only works for translating  but you get the idea if you wanna flip and scale it                        completion    BOOL complete         And that should be a decent solution for now

[ios] Cancel a UIView animation?

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