获取当前角度
CGFloat radius = atan2f(view.transform.b, view.transform.a);
CGFloat degree = radius * (360/ M_PI);
1、旋转到x度
view.transform = CGAffineTransformMakeRotation(x);
2、在现在旋转角度的基础上再旋转x度
CGAffineTransform currentTransform = view.transform;
CGAffineTransform newTransform = CGAffineTransformRotate(currentTransform, x); // 在现在的基础上旋转指定角度view.transform = newTransform;
恢复到0度
CGAffineTransform currentTransform = view.transform;
CGFloat rotation = (0.0 - recordDegree) * M_PI / 360.0f; // recordDegree记录现在的旋转角度
CGAffineTransform newTransform = CGAffineTransformRotate(currentTransform, rotation);
view.transform = newTransform;
