如何实现 SegmentedControlValueChange 来控制容器视图 [英] How to implement SegmentedControlValueChange to control Container View

问题描述

我的问题是对其他人的问题的跟进.在@ritch 提供的问题图片中，他有以下视图控制器

My question is a follow up to someone else's question. In the image that @ritch provides with his question, he has the following view controllers

"View Controller" -> (Container View)"View Controller" ->["First Controller", "Second Controller"]

对于我的问题，我将它们重写为

For my question, I will rewrite them as

"Parent Controller" -> (Container View)"Child Controller" ->["First Controller", "Second Controller"]

所以我正在尝试实现该方法

So I am trying to implement the method

- (IBAction)SegmentedControlValueChange:(UISegmentedControl *)sender
{
}

逻辑上我认为这个方法应该在父控制器"中，而作为参考，在子控制器"中我应该有 displayContentController 和

Logically I thought this method should be in "Parent Controller" while, for reference, in "Child Controller" I should have displayContentController and

FirstController *firstController = [self.storyboard instantiateViewControllerWithIdentifier:@"yourIdentifier"];

有人请帮我澄清一下:在 SegmentedControlValueChange 和 instantiateViewControllerWithIdentifier 之间:

Will someone please clarify for me: between SegmentedControlValueChange and instantiateViewControllerWithIdentifier:

• 父控制器"的 h 和 m 文件中包含哪些代码?
• 父控制器"的 h 和 m 文件中包含哪些代码?

推荐答案

最后我对我在问题中陈述的内容采取了不同的方法，因为我觉得使用故事板标识符有点丑陋"和不正确，因为视图没有转到他们那里去.

In the end I took a different approach to what I stated in my question as I felt using storyboard identifiers was bit 'ugly' and incorrect as the views had no segues going to them.

这就是我所做的:

我首先为要在容器视图中显示的视图控制器创建带有 XIB 文件的类.(例如 FirstController、SecondController 等.)

I started off by creating classes with XIB files for the view controllers that were going to be shown in the container view. (e.g. FirstController, SecondController etc..)

然后我把它放在我的 ViewController 的 ViewDidLoad 方法中(父视图控制器 - 带有分段控件的那个)

I then put this in the ViewDidLoad method of my ViewController (the parent view controller - the one with the segmented control)

- (void)viewDidLoad
{
    [super viewDidLoad];

    // First Controller
    self.firstViewController = [[FirstViewController alloc] init];

    // Second Controller
    self.secondViewController = [[SecondViewController alloc] init];

    // Add the controllers to an Array
    self.controllers = @[self.firstViewController, self.secondViewController];

    // Set the container to show the first view controller on load
    [self displayContentController:[self.controllers firstObject]];
}

然后我设置了三个方法来处理容器视图的视图显示和隐藏

I then set up three methods to handle the displaying and hiding of the views for the container view

- (void)displayContentController:(UIViewController *)content
{
    [self addChildViewController:content];
    content.view.frame = [self frameForContentController];
    [self.view addSubview:content.view];
    [content didMoveToParentViewController:self];

    // Set current controller
    self.currentController = content;
}

- (void)hideContentController: (UIViewController*)content
{
    [content willMoveToParentViewController:nil];
    [content.view removeFromSuperview];
    [content removeFromParentViewController];
}

- (CGRect)frameForContentController
{
    return self.contentController.frame;
}

最后，我在选择了不同的分段控件值时处理了该事件.

Then finally, I handled the event when a different segmented control value is selected.

- (IBAction)segmentedControlValueChanged:(UISegmentedControl *)sender
{
    // Hide current view controller
    [self hideContentController:self.currentController];
    // Show new selected view controller
    [self displayContentController:[self.controllers objectAtIndex:sender.selectedSegmentIndex]];
}

希望这会有所帮助.

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