Question

我正在使用下面的代码尝试让我的识别器在状态结束后继续旋转。无论我在CGAffineTransformRotate中设置多高值，它似乎只能获得一次旋转。

任何见解或建议都将受到赞赏。

感谢。

if([(UIRotationGestureRecognizer*)recognizer state] == UIGestureRecognizerStateEnded) 
{
    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:6.55];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
    recognizer.view.transform = CGAffineTransformRotate(recognizer.view.transform, 1000000000);
    [UIView commitAnimations];
}

Answer 1

您可能想尝试使用CABasicAnimation

- (void)rotate {

[CATransaction begin];
[CATransaction setValue:[NSNumber numberWithFloat:2.0] forKey:kCATransactionAnimationDuration];

CABasicAnimation *animation;
animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
animation.fromValue = [NSNumber numberWithFloat:0.0];
animation.toValue = [NSNumber numberWithFloat:2 * M_PI];
animation.timingFunction = [CAMediaTimingFunction functionWithName: kCAMediaTimingFunctionLinear];
animation.delegate = self;
[recognizer.layer addAnimation:animation forKey:@"rotationAnimation"];

[CATransaction commit];
}

- (void)animationDidStop:(CAAnimation *)theAnimation finished:(BOOL)finished {
if (finished) 
    [self rotate];  
}

这将导致旋转继续，直到您指定删除动画。

CABasicAnimation班级参考

中有更多信息和选项

一旦状态结束，如何让旋转手势继续旋转？

1 个答案: