检查子视图是否在视图中

发布于 2024-12-04 17:48:42 字数 660 浏览 0 评论 0原文

我正在制作一个应用程序，在 IBAction 上使用 addSubview: 将子视图添加到视图中。以同样的方式，当再次触摸带有该 IBAction 的按钮时，应在该 IBAction 上添加的子视图上调用 removeFromSuperview：

PSEUDO代码

-(IBAction)showPopup:(id)sender 
{
    System_monitorAppDelegate *delegate = (System_monitorAppDelegate *)[[UIApplication sharedApplication] delegate];
    UIView *rootView = delegate.window.rootViewController.view;

    if([self popoverView] is not on rootView) 
    { 
        [rootView addSubview:[self popoverView]];
    } 
    else 
    {
        [[self popoverView] removeFromSuperview];
    }

}

原文

I'm making an app where I add a subview to a view using addSubview: on an IBAction. In the same way, when the button with that IBAction is touched again should call removeFromSuperview on that subview added on that IBAction:

PSEUDO CODE

-(IBAction)showPopup:(id)sender 
{
    System_monitorAppDelegate *delegate = (System_monitorAppDelegate *)[[UIApplication sharedApplication] delegate];
    UIView *rootView = delegate.window.rootViewController.view;

    if([self popoverView] is not on rootView) 
    { 
        [rootView addSubview:[self popoverView]];
    } 
    else 
    {
        [[self popoverView] removeFromSuperview];
    }

}

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请爱~陌生人 2024-12-11 17:48:42

您可能正在寻找 UIView 的 -(BOOL)isDescendantOfView:(UIView *)view; ，取自 UIView 类参考。

返回值
是，如果接收器是近处或远处
视图的子视图或者视图是接收者本身；否则不行。

你最终会得到如下代码：

Objective-C

- (IBAction)showPopup:(id)sender {
    if(![self.myView isDescendantOfView:self.view]) { 
        [self.view addSubview:self.myView];
    } else {
        [self.myView removeFromSuperview];
    }
}

Swift 3

@IBAction func showPopup(sender: AnyObject) {
    if !self.myView.isDescendant(of: self.view) {
        self.view.addSubview(self.myView)
    } else {
        self.myView.removeFromSuperview()
    }
}

You are probably looking for UIView's -(BOOL)isDescendantOfView:(UIView *)view; taken in UIView class reference.

Return Value
YES if the receiver is an immediate or distant
subview of view or if view is the receiver itself; otherwise NO.

You will end up with a code like :

Objective-C

- (IBAction)showPopup:(id)sender {
    if(![self.myView isDescendantOfView:self.view]) { 
        [self.view addSubview:self.myView];
    } else {
        [self.myView removeFromSuperview];
    }
}

Swift 3

@IBAction func showPopup(sender: AnyObject) {
    if !self.myView.isDescendant(of: self.view) {
        self.view.addSubview(self.myView)
    } else {
        self.myView.removeFromSuperview()
    }
}

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岁吢 2024-12-11 17:48:42

试试这个：

-(IBAction)showPopup:(id)sender
{
    if (!myView.superview)
        [self.view addSubview:myView];
    else
        [myView removeFromSuperview];
}

Try this:

-(IBAction)showPopup:(id)sender
{
    if (!myView.superview)
        [self.view addSubview:myView];
    else
        [myView removeFromSuperview];
}

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年华零落成诗 2024-12-11 17:48:42

    UIView *subview = ...;
    if([self.view.subviews containsObject:subview]) {
        ...
    }

    UIView *subview = ...;
    if([self.view.subviews containsObject:subview]) {
        ...
    }

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ぇ气 2024-12-11 17:48:42

Swift 的等价物看起来像这样：

if(!myView.isDescendantOfView(self.view)) {
    self.view.addSubview(myView)
} else {
    myView.removeFromSuperview()
}

The Swift equivalent will look something like this:

if(!myView.isDescendantOfView(self.view)) {
    self.view.addSubview(myView)
} else {
    myView.removeFromSuperview()
}

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天生の放荡 2024-12-11 17:48:42

检查子视图的超级视图...

-(IBAction)showPopup:(id)sender {
    if([[self myView] superview] == self.view) { 
        [[self myView] removeFromSuperview];           
    } else {
        [self.view addSubview:[self myView]];         
    }
}

Check the superview of the subview...

-(IBAction)showPopup:(id)sender {
    if([[self myView] superview] == self.view) { 
        [[self myView] removeFromSuperview];           
    } else {
        [self.view addSubview:[self myView]];         
    }
}

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最美不过初阳 2024-12-11 17:48:42

你的 if 条件应该像

if (!([rootView subviews] containsObject:[self popoverView])) { 
    [rootView addSubview:[self popoverView]];
} else {
    [[self popoverView] removeFromSuperview];

}

Your if condition should go like

if (!([rootView subviews] containsObject:[self popoverView])) { 
    [rootView addSubview:[self popoverView]];
} else {
    [[self popoverView] removeFromSuperview];

}

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巡山小妖精 2024-12-11 17:48:42

这里我们使用了两种不同的视图。父视图是我们在其中搜索后代视图并检查是否添加到父视图的视图。

if parentView.subviews.contains(descendantView) {
   // descendant view added to the parent view.
}else{
  // descendant view not added to the parent view.
}

Here we used two different views. Parent view is the view in which we are searching for descendant view and check wether added to parent view or not.

if parentView.subviews.contains(descendantView) {
   // descendant view added to the parent view.
}else{
  // descendant view not added to the parent view.
}

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~没有更多了~