iOS 开发设置空间旋转中心点的代码

Posted 2020-06-14

//让控件以 [self setAnchorPoint:CGPointMake(0, 0) forView:smallImg];为中心点旋转

//CGPointMake(0, 0)   控件的左上角为中心点

//CGPointMake(1, 1)   控件的右下角为中心点

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

{

    CGPoint oldOrigin = view.frame.origin;

    view.layer.anchorPoint = anchorPoint;

    CGPoint newOrigin = view.frame.origin;

    

    CGPoint transition;

    transition.x = newOrigin.x - oldOrigin.x;

    transition.y = newOrigin.y - oldOrigin.y;

    

    view.center = CGPointMake (view.center.x - transition.x, view.center.y - transition.y);

}