Question

I want to rotate a UIButton when connection start and want to stop rotating when connection stop.

So my question is how to start or stop rotation on UIButton.

I use the following code for rotation.

[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:5.0];

// (180 * M_PI) / 180 == M_PI, so just use M_PI
btn.transform = CGAffineTransformMakeRotation(M_PI);

[UIView commitAnimations];

Answer 1

You can remove animations from a view by calling removeAllAnimations

[btn.layer removeAllAnimations];

Make sure you import QuartzCore before accessing layer properties, otherwise you may get a warning.

#import <QuartzCore/QuartzCore.h>

To make the view animate continuously use the + (void)setAnimationRepeatCount:(float)repeatCount method on UIView and set it to some arbitrary high number.

[UIView setAnimationRepeatCount:5000];