Question

这里要开始的基本代码是:

[UIView transitionWithView:self.view duration:2.0
                   options:UIViewAnimationOptionBeginFromCurrentState
                animations:^ {         

                    CALayer *layer1 = leftband.layer;
                    layer1.anchorPoint = CGPointMake(0, 0.5);
                    CATransform3D rotationAndPerspectiveTransform1 = CATransform3DIdentity;
                    rotationAndPerspectiveTransform1.m34 = 1.0 / -500;
                    rotationAndPerspectiveTransform1 = CATransform3DRotate(rotationAndPerspectiveTransform1, DegreesToRadians(-180.0f), 0.0f, 1.0f, 0.0f);
                    layer1.transform = rotationAndPerspectiveTransform1;

                    CALayer *layer2 = rightband.layer;
                    layer2.anchorPoint = CGPointMake(0, 0.5);
                    CATransform3D rotationAndPerspectiveTransform2 = CATransform3DIdentity;
                    rotationAndPerspectiveTransform2.m34 = 1.0 / -500;
                    rotationAndPerspectiveTransform2 = CATransform3DRotate(rotationAndPerspectiveTransform2, DegreesToRadians(180.0f), 0.0f, 1.0f, 0.0f);
                    layer2.transform = rotationAndPerspectiveTransform2;
                }
                completion:nil {

                }];

左带和右带是两个 UIIMage Views 。我想要的效果是左带动画随着Y轴向左的变换而向左。而右带则沿着Y轴向右的变换。

但上述代码导致左向和右向图像视图在同一方向动画( 仅发生于左方向 ) 。我猜我对锚点的理解是错误的。旋转变换中的 - 180 度和+180 度都会导致左向动画。

我在这里做错什么了?

Answer 1

基本上在动画块运行前设置锚点解决问题。左- gt; (0.0f, 0. 5f) 和右- gt; (1.0f, 0. 5f) 的锁定点。

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