ios 将子视图置于所有其他视图之前
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/13182482/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Bringing a subview to be in front of all other views
提问by Mark S
I am working on integrating an ad provider into my app currently. I wish to place a fading message in front of the ad when the ad displays but have been completely unsuccessful.
我目前正在将广告提供商集成到我的应用程序中。当广告显示但完全不成功时，我希望在广告前放置一条淡入淡出的消息。
I made a function which adds a subview to my current view and tries to bring it to the front using
我做了一个函数，它向我当前的视图添加一个子视图，并尝试使用
[self.view bringSubviewToFront:mySubview]
The function fires on notification that the ad loaded (the notification is from the adprovider's SDK). However, my subview does not end up in front of the ad. I imagine this is made purposely difficult by the ad provider, but I wish to do it regardless. I am currently discussing with the provider whether or not this can be allowed. But for the time being, I just want to see if it's even possible.
该函数在广告加载的通知（通知来自广告提供商的 SDK）时触发。但是，我的子视图并没有出现在广告前面。我想这是广告提供商故意使这变得困难的，但无论如何我都希望这样做。我目前正在与提供商讨论是否允许这样做。但就目前而言，我只是想看看这是否可能。
Is there anyway I can force a subview of mine to be the top-most view such that it will not be obstructed by anything?
无论如何我可以强制我的一个子视图成为最顶层的视图，这样它就不会被任何东西挡住了吗？
回答by daniel kilinskas
try this:
尝试这个：
self.view.layer.zPosition = 1;
回答by jere
What if the ad provider's view is not added to self.viewbut to something like [UIApplication sharedApplication].keyWindow?
如果广告提供商的视图没有添加到self.view诸如[UIApplication sharedApplication].keyWindow?
Try something like:
尝试类似：
[[UIApplication sharedApplication].keyWindow addSubview:yourSubview]
or
或者
[[UIApplication sharedApplication].keyWindow bringSubviewToFront:yourSubview]
回答by Paul Lehn
Swift 2 version of Jere's answer:
Jere 回答的 Swift 2 版本：
UIApplication.sharedApplication().keyWindow!.bringSubviewToFront(YourViewHere)
Swift 3:
斯威夫特 3：
UIApplication.shared.keyWindow!.bringSubview(toFront: YourViewHere)
Swift 4:
斯威夫特 4：
UIApplication.shared.keyWindow!.bringSubviewToFront(YourViewHere)
Hope it saves someone 10 seconds! ;)
希望它能为某人节省 10 秒钟！;)
回答by rmaddy
I had a need for this once. I created a custom UIViewclass - AlwaysOnTopView.
我有一次需要这个。我创建了一个自定义UIView类 - AlwaysOnTopView.
@interface AlwaysOnTopView : UIView
@end
@implementation AlwaysOnTopView
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
if (object == self.superview && [keyPath isEqual:@"subviews.@count"]) {
[self.superview bringSubviewToFront:self];
}
[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
}
- (void)willMoveToSuperview:(UIView *)newSuperview {
if (self.superview) {
[self.superview removeObserver:self forKeyPath:@"subviews.@count"];
}
[super willMoveToSuperview:newSuperview];
}
- (void)didMoveToSuperview {
[super didMoveToSuperview];
if (self.superview) {
[self.superview addObserver:self forKeyPath:@"subviews.@count" options:0 context:nil];
}
}
@end
Have your view extend this class. Of course this only ensures a subview is above all of its sibling views.
让你的观点扩展这个类。当然，这只能确保子视图高于其所有兄弟视图。
回答by Gobi M
As far as i experienced zposition is a best way.
就我而言，zposition 是最好的方法。
self.view.layer.zPosition = 1;
self.view.layer.zPosition = 1;
回答by Anisetti Nagendra
In c#, View.BringSubviewToFront(childView); YourView.Layer.ZPosition = 1; both should work.
在 C# 中，View.BringSubviewToFront(childView); YourView.Layer.ZPosition = 1; 两者都应该工作。
回答by Zgpeace
Let me make a conclusion. In Swift 5
让我做一个结论。在斯威夫特 5
You can choose to addSubview to keyWindow, if you add the view in the last. Otherwise, you can bringSubViewToFront.
您可以选择将Subview 添加到keyWindow，如果您在最后添加视图。否则，您可以带来SubViewToFront。
let view = UIView()
UIApplication.shared.keyWindow?.addSubview(view)
UIApplication.shared.keyWindow?.bringSubviewToFront(view)
You can also set the zPosition. But the drawback is that you can not change the gesture responding order.
您还可以设置 zPosition。但缺点是不能改变手势响应顺序。
view.layer.zPosition = 1
回答by Vinoth Vino
In Swift 4.2
在Swift 4.2 中
UIApplication.shared.keyWindow!.bringSubviewToFront(yourView)
Source: https://developer.apple.com/documentation/uikit/uiview/1622541-bringsubviewtofront#declarations
来源：https: //developer.apple.com/documentation/uikit/uiview/1622541-bringsubviewtofront#declarations
回答by user5266363
xamarin ios : this.InsertSubview(subview_youwant_beback, 0);
xamarin ios : this.InsertSubview(subview_youwant_beback, 0);
