iOS 实现UIImageView 的不停的旋转（更新：2017.7.26）

1.先创建一个UIImageView.

- (void)createImageView {

UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0.0,0.0, frame.size.width, frame.size.height)];

imageView.image = [UIImageimageNamed:@"image1.png"];

self.myImageView = imageView;

[self addSubview:imageView];

}

问题：方法一二是让iamgeview 循环旋转角度，如果把imageview 放在tableviewcell上边，每次刷新tableview，imageview 的旋转速度会加倍；没有去做相应的处理，而是直接利用另一个旋转方法三

方法三：

CABasicAnimation *animation =  [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
//默认是顺时针效果，若将fromValue和toValue的值互换，则为逆时针效果
animation.fromValue = [NSNumber numberWithFloat:0.f];
animation.toValue =  [NSNumber numberWithFloat: M_PI *2];
animation.duration  = 1;
animation.autoreverses = NO;
animation.fillMode =kCAFillModeForwards;
animation.repeatCount = MAXFLOAT; //如果这里想设置成一直自旋转，可以设置为MAXFLOAT，否则设置具体的数值则代表执行多少次
[self.imageView1.layer addAnimation:animation forKey:nil];

//方法一：

- (void)buttonAction:(id)sender {

angle = 0.0;

[selfstartAnimation];

}

- (void)startAnimation

{

[UIView beginAnimations:nilcontext:nil];

[UIView setAnimationDuration:0.01];

[UIView setAnimationDelegate:self];

[UIView setAnimationDidStopSelector:@selector(endAnimation)];

self.myImageView.transform = CGAffineTransformMakeRotation(angle * (M_PI /180.0f));

[UIView commitAnimations];

}

-(void)endAnimation

{

angle += 15;

[selfstartAnimation];

}

方法一

//方法二：(使用Block)

- (void)startAnimation

{

CGAffineTransform endAngle = CGAffineTransformMakeRotation(angle * (M_PI /180.0f));

[UIView animateWithDuration:0.01delay:0 options:UIViewAnimationOptionCurveLinearanimations:^{

self.myImageView.transform = endAngle;

} completion:^(BOOL finished) {

angle += 15;

[selfstartAnimation];

}];

}