iPhone UIView Animation Best Practice

Question

What is considered best practice for animating view transitions on the iPhone    For example  the ViewTransitions sample project from apple uses code like   CATransition  applicationLoadViewIn    CATransition animation    applicationLoadViewIn setDuration 1    applicationLoadViewIn setType kCATransitionReveal    applicationLoadViewIn setTimingFunction  CAMediaTimingFunction functionWithName kCAMediaTimingFunctionEaseIn      myview layer  addAnimation applicationLoadViewIn forKey kCATransitionReveal     but there are also code snippets floating around the net that look like this     UIView beginAnimations nil context nil    UIView setAnimationDuration 0 75    UIView setAnimationDelegate self    UIView setAnimationTransition UIViewAnimationTransitionFlipFromRight forView myview cache YES    myview removeFromSuperview    UIView commitAnimations     What is the best approach  If you could provide a snippet as well it d be much appreciated    NOTE  I ve been unable to get the second approach to work correctly

User · Answer

We can animate images in ios 5 using this simple code      CGRect imageFrame   imageView frame  imageFrame origin y   self view bounds size height    UIView animateWithDuration 0 5     delay 1 0     options  UIViewAnimationCurveEaseOut     animations            imageView frame   imageFrame             completion   BOOL finished           NSLog   Done

User · Answer

let s do try and checkout For Swift 3     UIView transition with  mysuperview  duration  0 75  options UIViewAnimationOptions transitionFlipFromRight   animations        myview removeFromSuperview      completion  nil

User · Answer

The difference seems to be the amount of control you need over the animation   The CATransition approach gives you more control and therefore more things to set up  eg  the timing function  Being an object  you can store it for later  refactor to point all your animations at it to reduce duplicated code  etc   The UIView class methods are convenience methods for common animations  but are more limited than CATransition  For example  there are only four possible transition types  flip left  flip right  curl up  curl down   If you wanted to do a fade in  you d have to either dig down to CATransition s fade transition  or set up an explicit animation of your UIView s alpha   Note that CATransition on Mac OS X will let you specify an arbitrary CoreImage filter to use as a transition  but as it stands now you can t do this on the iPhone  which lacks CoreImage

User · Answer

I have been using the latter for a lot of nice lightweight animations   You can use it crossfade two views  or fade one in in front of another  or fade it out   You can shoot a view over another like a banner  you can make a view stretch or shrink     I m getting a lot of mileage out of beginAnimation commitAnimations   Don t think that all you can do is     UIView setAnimationTransition UIViewAnimationTransitionFlipFromRight forView myview cache YES     Here is a sample    UIView beginAnimations nil context NULL          UIView setAnimationCurve UIViewAnimationCurveEaseInOut        UIView setAnimationDuration 1 0        UIView setAnimationDelegate self       if  movingViewIn       after the animation is over  call afterAnimationProceedWithGame     to start the game          UIView setAnimationDidStopSelector  selector afterAnimationProceedWithGame              UIView setAnimationRepeatCount 5 0      don t forget you can repeat an animation          UIView setAnimationDelay 0 50            UIView setAnimationRepeatAutoreverses YES            gameView alpha   1 0          topGameView alpha   1 0          viewrect1 origin y   selfrect size height -  viewrect1 size height           viewrect2 origin y   -20           topGameView alpha   1 0            else          call putBackStatusBar after animation to restore the state after this animation          UIView setAnimationDidStopSelector  selector putBackStatusBar            gameView alpha   0 0          topGameView alpha   0 0             gameView setFrame viewrect1        topGameView setFrame viewrect2       UIView commitAnimations     As you can see  you can play with alpha  frames  and even sizes of a view   Play around   You may be surprised with its capabilities

User · Answer

Anyway the   Block  method is preffered now-a-days  I will explain the simple block below   Consider the snipped below  bug2 and bug 3 are imageViews  The below animation describes an animation with 1 second duration after a delay of 1 second  The bug3 is moved from its center to bug2 s center  Once the animation is completed it will be logged  Center Animation Done     - void centerAnimation  id sender   NSLog   Center animation triggered     CGPoint bug2Center   bug2 center    UIView animateWithDuration 1                       delay 1 0                     options  UIViewAnimationCurveEaseOut                  animations                         bug3 center   bug2Center                                       completion   BOOL finished                        NSLog   Center Animation Done                              Hope that s clean

User · Answer

In the UIView docs  have a read about this function for ios4      void transitionFromView  UIView   fromView toView  UIView   toView duration  NSTimeInterval duration options  UIViewAnimationOptions options completion  void     BOOL finished  completion

User · Answer

Here is Code for Smooth animation  might Be helpful for many developers  I found this snippet of code from this tutorial   CABasicAnimation  animation    CABasicAnimation animationWithKeyPath   transform scale     animation setTimingFunction  CAMediaTimingFunction functionWithName kCAMediaTimingFunctionEaseInEaseOut     animation setAutoreverses YES    animation setFromValue  NSNumber numberWithFloat 1 3f     animation setToValue  NSNumber numberWithFloat 1 f     animation setDuration 2 f    animation setRemovedOnCompletion NO     animation setFillMode kCAFillModeForwards     self myView layer  addAnimation animation forKey   scale       add here any Controller that you want t put Smooth animation

User · Answer

From the UIView reference s section about the beginAnimations context  method      Use of this method is discouraged in iPhone OS 4 0 and later  You should use the block-based animation methods instead    Eg of Block-based Animation based on Tom s Comment   UIView transitionWithView mysuperview                    duration 0 75                    options UIViewAnimationTransitionFlipFromRight                 animations                          myview removeFromSuperview                                       completion nil

[iphone] iPhone UIView Animation Best Practice

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