Last active
June 17, 2018 13:08
-
-
Save boherna/76edbed674e0a20a57dd to your computer and use it in GitHub Desktop.
Spin animation of indefinite duration (not INFINITE). It can be stopped at an even quarter turn if needed. Also, the acceleration ramps up during the first 90 degrees, and decelerates during the last 90 degrees (after a stop has been requested).
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| // an ivar for your class: | |
| BOOL animating; | |
| - (void)spinWithOptions:(UIViewAnimationOptions)options | |
| { | |
| // this spin completes 360 degrees every 2 seconds | |
| [UIView animateWithDuration: 0.5f | |
| delay: 0.0f | |
| options: options | |
| animations: ^{ | |
| self.imageToMove.transform = CGAffineTransformRotate(imageToMove.transform, M_PI / 2); | |
| } | |
| completion: ^(BOOL finished) | |
| { | |
| if (finished) | |
| { | |
| if (animating) | |
| { | |
| // if flag still set, keep spinning with constant speed | |
| [self spinWithOptions: UIViewAnimationOptionCurveLinear]; | |
| } | |
| else | |
| if (options != UIViewAnimationOptionCurveEaseOut) | |
| { | |
| // one last spin, with deceleration | |
| [self spinWithOptions: UIViewAnimationOptionCurveEaseOut]; | |
| } | |
| } | |
| }]; | |
| } | |
| - (void) startSpin | |
| { | |
| if (!animating) | |
| { | |
| animating = YES; | |
| [self spinWithOptions: UIViewAnimationOptionCurveEaseIn]; | |
| } | |
| } | |
| - (void) stopSpin | |
| { | |
| // set the flag to stop spinning after one last 90 degree increment | |
| animating = NO; | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment