iOS 状态栏中的加载指示器
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/11068143/
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
Loading Indicator in Status Bar iOS
提问by RileyE
I'm trying to figure out what the loading circle animation in the status bar is. A lot of apps, when they load data, have a spinner in the status bar to indicate that the app is loading data, but I can't figure out what its called to implement it. Can someone tell me what it is called?
我想弄清楚状态栏中的加载圆圈动画是什么。许多应用程序在加载数据时，在状态栏中都有一个微调器，以指示该应用程序正在加载数据，但我无法弄清楚它调用了什么来实现它。谁能告诉我它叫什么？
If you don't know what I'm talking about, but have an iOS device, try loading a web page in Safari and look at the spinner in the status bar. Thats what I'm talking about.
如果您不知道我在说什么，但有 iOS 设备，请尝试在 Safari 中加载网页并查看状态栏中的微调器。我正是这个意思。
Here is an screenshot I took 
.
这是我截取的屏幕截图。
回答by Chris Trahey
I think what you are looking for is:
我认为你正在寻找的是：
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
Swift 3
斯威夫特 3
UIApplication.shared.isNetworkActivityIndicatorVisible = true
as doc'd here: https://developer.apple.com/documentation/uikit/uiapplication/1623102-isnetworkactivityindicatorvisibl
正如这里的文档：https: //developer.apple.com/documentation/uikit/uiapplication/1623102-isnetworkactivityindicatorvisibl
回答by RhodanV5500
Same as above just in Swift:
与上面相同，仅在 Swift 中：
UIApplication.sharedApplication().networkActivityIndicatorVisible = true
回答by 16patsle
For anyone looking for the answer to this is Swift 3, you just set the property isNetworkActivityIndicatorVisibleon UIApplicationto true.
为寻找这个问题的答案是斯威夫特3，您只需设置属性isNetworkActivityIndicatorVisible上UIApplication为true。
For instance in the didFinishLaunchingWithOptonsfunction in the app delegate:
例如在didFinishLaunchingWithOptons应用程序委托的函数中：
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool { // Override point for customization after application launch.
application.isNetworkActivityIndicatorVisible = true
return true
}
Which basically means:
这基本上意味着：
UIApplication.sharedApplication().isNetworkActivityIndicatorVisible = true
回答by Evgeny Karkan
Swift 4
斯威夫特 4
UIApplication.shared.isNetworkActivityIndicatorVisible = true
回答by MCKapur
It is UIActivityIndicatorView. You can check out its documentation and learn more here: UIActivityIndicatorView
它是UIActivityIndicatorView。您可以查看其文档并在此处了解更多信息：UIActivityIndicatorView
Also, to put it on the status bar, check out this link: Activity Monitor Status Bar
另外，要将它放在状态栏上，请查看此链接： 活动监视器状态栏
