ios – 如何使子视图居中

我正在向另一个UIViewController添加一个UIViewController子视图.

它很棒.但我很难尝试将子视图置于父视图的中间.

我读了,我找到了两行代码,但对我来说不起作用.

谁能指出我的问题？

那些是：

popupController.view.center = [self.view convertPoint：self.view.center fromView：self.view.superview];

和

popupController.view.center = CGPointMake(self.view.bounds.size.width / 2,self.view.bounds.size.height / 2);

父视图控制器代码：

- (IBACtion)SELEctRoutIne:(id)sender {
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Storyboard" bundle:nil];

    createRoutInePopupViewController* popupController = [storyboard instantiateViewControllerWithIdentifier:@"createRoutInePopupView"];
   // popupController.view.center = [self.view convertPoint:self.view.center fromView:self.view.superview];
    popupController.view.center = CGPointMake(self.view.bounds.size.width / 2,self.view.bounds.size.height / 2);

    //Tell the operating system the CreateRoutIne view controller
    //is becoming a child:
    [self addChildViewController:popupController];

    //add the target frame to self's view:
    [self.view addSubview:popupController.view];

    //Tell the operating system the view controller has moved:
    [popupController didMoveToParentViewController:self];


}

儿童设置

- (IBACtion)SELEctRoutIne:(id)sender
{
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Storyboard" bundle:nil];

    createRoutInePopupViewController* popupController = [storyboard instantiateViewControllerWithIdentifier:@"createRoutInePopupView"];

    [self addChildViewController:popupController];
    [self.view addSubview:popupController.view];
    [popupController didMoveToParentViewController:self];

    //do the centering here
    popupController.view.center = [self.view convertPoint:self.view.center fromView:self.view.superview];

}

- (void)didMoveToParentViewController:(UIViewController *)parent
{
    //whatever code you have here

    self.view.center = self.view.superview.center;
}