CALayer *znzLayer; = [[CALayer alloc]init];

//创建不断该表CALayer的transform属性动画

    CABasicAnimation *anim = [CABasicAnimation animationWithKeyPath:@"transform"];

    CATransform3D fromValue = znzLayer.transform;

    //设置动画开始的属性值

    anim.fromValue = [NSValue valueWithCATransform3D:fromValue];

    //绕z轴旋转heading弧度的变换矩阵

    CATransform3D toValue = CATransform3DMakeRotation(headings, 0, 0, 1);

    //设置动画结束的属性

    anim.toValue = [NSValue valueWithCATransform3D:toValue];

    anim.duration = 0.5;//持续时间

    anim.removedOnCompletion = YES; //如果需要继续使用本动画可以不用设置该属性,默认为NO,

    //设置动画结束后anzLayer的变换矩阵

    znzLayer.transform = toValue;

    //为znzLayer添加动画

    [znzLayer addAnimation:anim forKey:nil];