关于旋转动画只能画少一个pai 的问题

转载自：http://blog.youkuaiyun.com/zhibudefeng/article/details/8691567

CABasicAnimation *rotationAnimation = [CABasicAnimationanimationWithKeyPath:@"transform.rotation.z"];

    rotationAnimation.toValue = [NSNumbernumberWithFloat:2*M_PI*0.722];

    rotationAnimation.duration = 1.0f;

    rotationAnimation.repeatCount = MAXFLOAT;

    rotationAnimation.autoreverses = YES;

    rotationAnimation.timingFunction = [CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionEaseInEaseOut];

    [self.pointerImageView.layeraddAnimation:rotationAnimation forKey:nil];

用下面这种方法则只会花半个圆： 

CGAffineTransform  transform;

    transform = CGAffineTransformRotate(self.pointerImageView.transform,2*M_PI*0.722);

    [UIView beginAnimations:@"rotate" context:nil ];

    [UIViewsetAnimationDuration:2];

    [UIViewsetAnimationDelegate:self];

    [self.pointerImageView  setTransform:transform];

    [UIView commitAnimations];

如果想动画执行一次后停止在当前位置 ，则应该这么做:

CABasicAnimation *rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];

    rotationAnimation.toValue = [NSNumber numberWithFloat:2*M_PI*0.722];

    rotationAnimation.duration = 1.5f;

    rotationAnimation.repeatCount = 0;

    rotationAnimation.autoreverses = NO;

    rotationAnimation.removedOnCompletion = NO; //要实现完成动画后停止在当前位置  这个值应该设置成NO  然后下边的kCAFillModeForwards这个才会起作用

    rotationAnimation.fillMode = kCAFillModeForwards;

    rotationAnimation.delegate = self;

    rotationAnimation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];

    [self.pointerImageView.layer addAnimation:rotationAnimation forKey:@"KeyStartSwing"];