Iphone 如何更改帧的旋转点

我正在尝试使用旋转设置帧的动画：

[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];

self.toNextButton.transform = CGAffineTransformMakeRotation(180.0f);

[UIView commitAnimations];

---

但这个代码是围绕他的中心旋转的。如何围绕帧的右下角旋转？

在开始动画之前添加以下行

self.toNextButton.layer.anchorPoint = // right bottom point on the button

---

在开始动画之前添加以下行

self.toNextButton.layer.anchorPoint = // right bottom point on the button

---

您需要更改视图。图层的锚点

-(void)setAnchorPoint:(CGPoint)anchorPoint forView:(UIView *)view
{

    CGPoint newPoint = CGPointMake(view.bounds.size.width * anchorPoint.x, view.bounds.size.height * anchorPoint.y);
    CGPoint oldPoint = CGPointMake(view.bounds.size.width * view.layer.anchorPoint.x, view.bounds.size.height * view.layer.anchorPoint.y);

    newPoint = CGPointApplyAffineTransform(newPoint, view.transform);
    oldPoint = CGPointApplyAffineTransform(oldPoint, view.transform);

    CGPoint position = view.layer.position;

    position.x -= oldPoint.x;
    position.x += newPoint.x;

    position.y -= oldPoint.y;
    position.y += newPoint.y;

    view.layer.position = position;
    view.layer.anchorPoint = anchorPoint;
}

你应该这样实现

[self setAnchorPoint:CGPointMake(1,1)];
UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];

self.toNextButton.transform = CGAffineTransformMakeRotation(180.0f);

[UIView commitAnimations];

---

您需要更改视图。图层的锚点

-(void)setAnchorPoint:(CGPoint)anchorPoint forView:(UIView *)view
{

    CGPoint newPoint = CGPointMake(view.bounds.size.width * anchorPoint.x, view.bounds.size.height * anchorPoint.y);
    CGPoint oldPoint = CGPointMake(view.bounds.size.width * view.layer.anchorPoint.x, view.bounds.size.height * view.layer.anchorPoint.y);

    newPoint = CGPointApplyAffineTransform(newPoint, view.transform);
    oldPoint = CGPointApplyAffineTransform(oldPoint, view.transform);

    CGPoint position = view.layer.position;

    position.x -= oldPoint.x;
    position.x += newPoint.x;

    position.y -= oldPoint.y;
    position.y += newPoint.y;

    view.layer.position = position;
    view.layer.anchorPoint = anchorPoint;
}

你应该这样实现

[self setAnchorPoint:CGPointMake(1,1)];
UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1];
[UIView setAnimationCurve:UIViewAnimationCurveLinear];

self.toNextButton.transform = CGAffineTransformMakeRotation(180.0f);

[UIView commitAnimations];

---

您可以尝试将xib中的

toNextButton

的中心点设置到它的右下角，这可能会解决您的问题：）检查此帖子：您可以尝试将xib中的

toNextButton

的中心点设置到它的右下角，这可能会解决您的问题：）检查此帖子：

anchorPoint

它必须是按钮的右下角？在这种情况下，我的按钮正在消失。

anchorPoint

它必须位于按钮的右下角？在这种情况下，我的按钮不见了。。