动画视图 - 旋转，缩小和移出屏幕

Question

我有一个自定义UIView类，我想同时旋转，缩小并以随机角度离开屏幕。

我有这个代码会将图层旋转几次

- (void)spinLayer:(CALayer *)inLayer duration:(CFTimeInterval)inDuration currentAngle:(CGFloat)curAngle
        direction:(int)direction
{
    CABasicAnimation* rotationAnimation;

    // Rotate about the z axis
    rotationAnimation = 
    [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];

    // Rotate 360 degress, in direction specified
    rotationAnimation.toValue = [NSNumber numberWithFloat:(M_PI * 4 * direction) + curAngle];

    // Perform the rotation over this many seconds
    rotationAnimation.duration = inDuration;

    // Set the pacing of the animation
    rotationAnimation.timingFunction = 
    [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];

    // Add animation to the layer and make it so
    [inLayer addAnimation:rotationAnimation forKey:@"rotationAnimation"];
}

我称之为：

CGFloat angle = atan2(sender.transform.b, sender.transform.a);  // Current angle
[self spinLayer:sender.layer duration:0.5 currentAngle:angle direction:1]; //direction can be -1

但是我现在怎么能缩小视图并同时移动它呢？

由于

Answer 1

将视图旋转360度不产生动画，因为开始和结束状态相同。您应该尝试使用多个值作为旋转值。