view围绕圆心自转

创建一个image

UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(40, 50, 200, 200)];

imgView.image = [UIImage imageNamed:@"image"];

[self.view addSubview:imgView];

 

创建一个基础动画

CABasicAnimation *animation = [CABasicAnimation new];

 

设置动画要改变的属性

animation.keyPath = @"transform.rotation.z";
//animation.fromValue = @(_bgImgV.layer.transform.m11);  

动画的最终属性的值（转7.5圈）

animation.toValue = @(M_PI*1);

 

动画的播放时间

animation.duration = 3;

 

动画效果慢进慢出

animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];

   

解决动画结束后回到原始状态的问题

animation.removedOnCompletion = NO;
animation.fillMode = kCAFillModeForwards;

 

将动画添加到imgView的layer上

[imgView.layer addAnimation:animation forKey:@"rotation"];