后来想到一种办法,就是一个变量不断的累加变大,这样影响弧度也随着变化,就达到了圆周运动的效果。
直接上代码:
- -(void) startAnimation
- {
- [UIView beginAnimations:nil context:nil];
- [UIView setAnimationDuration:0.01];
- [UIView setAnimationDelegate:self];
- [UIView setAnimationDidStopSelector:@selector(endAnimation)];
- imageView.transform = CGAffineTransformMakeRotation(angle * (M_PI / 180.0f));
- [UIView commitAnimations];
- }
- -(void)endAnimation
- {
- angle += 10;
- [self startAnimation];
- }
当然你可以用block的方式写也是一样的。
- - (void)startAnimation
- {
- CGAffineTransform endAngle = CGAffineTransformMakeRotation(imageviewAngle * (M_PI / 180.0f));
- [UIView animateWithDuration:0.01 delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
- imageView.transform = endAngle;
- } completion:^(BOOL finished) {
- angle += 10; [self startAnimation];
- }];
- }
PS:其中angle是double类型。
这下就可以360度旋转了。
还有一种方法:
- CABasicAnimation* rotationAnimation;
- rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
- rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2.0 ];
- rotationAnimation.duration = duration;
- rotationAnimation.cumulative = YES;
- rotationAnimation.repeatCount = repeat;
- [_loadingView.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];
reference:https://github.com/jonasschnelli/UIView-i7Rotate360