iOS 将子视图带回来

Question

I want ot bring a view to appear on the top of another view.

Here is my view hierarchy:

Basically I want to bring the button(Start Again) in front of the UIImageView which belongs to PageViewController. So I want to be able to scroll with the button on the top of the images.

Here is my code:

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Create the data model
    _pageTitles = @[@"Over 200 Tips and Tricks", @"Discover Hidden Features", @"Bookmark Favorite Tip", @"Free Regular Update"];
    _pageImages = @[@"page1.png", @"page2.png", @"page3.png", @"page4.png"];

    // Create page view controller
    self.pageViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"PageViewController"];
    self.pageViewController.dataSource = self;

    PageContentViewController *startingViewController = [self viewControllerAtIndex:0];
    NSArray *viewControllers = @[startingViewController];
    [self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];

    // Change the size of page view controller
    self.pageViewController.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height - 30);

    [self addChildViewController:_pageViewController];
    [self.view addSubview:_pageViewController.view];
    [self.pageViewController didMoveToParentViewController:self];

}

Answer 1

您是否尝试过使用以下代码？

[self.view bringSubviewToFront:yourButtonView];

Answer 2

正如@iamataptool建议我将PageViewController带回来：

[self.view sendSubviewToBack: _pageViewController.view];

Answer 3

It seems like you're using storyboard and programmatic UIView positioning in parallel. Therefore you have different possible solutions:

Fix the symptoms by manually pushing it up <-- not recommended Push your buttonView in front of all your other views (also the embedded ones) by

[self.view bringSubviewToFront:yourButtonView];

Nevertheless, as mentioned, this only fixes the symptom, but if you want to add more 'overlaying' elements, you would have to do that for all of them. Better would be:

Or the programmatic approach: Add your UIButton programmatically instead of the storyboard after you added the view of the UIPageViewController to your view hierarchy. So after you did this

[self.view addSubview:_pageViewController.view];

Simply instantiate a UIButton with your configuration and add it via

[self.view addSubview:yourProgrammaticallyCreatedButton];

Or add a container view <-- My recommendation Add another view (we can call it container view) under your button - but don't add the button to that containerview. Give it constraints to have the same frame as your UIViewController 's view. Hold a IBOutlet to that UIView and use this view to add the UIPageViewControllers view.

 _pageViewController.view.frame = self.containerView.bounds;
 [self.containerView addSubView: _pageViewController.view]