如何解释 Xamarin.iOS 中的 NetworkReachabilityFlags? [英] How to interpret NetworkReachabilityFlags in Xamarin.iOS?

问题描述

我正在使用 NetworkReachability 来确定我的应用的连接状态:

NetworkReachability(this.currentHostUrl);remoteHostReachability.SetNotification(this.ReachabilityChanged);remoteHostReachability.Schedule(CFRunLoop.Current, CFRunLoop.ModeDefault);

回调方法如下所示:

void ReachabilityChanged(NetworkReachabilityFlags flags){this.reachable = (flags & NetworkReachabilityFlags.Reachable) >0;UIHelpers.GetAppDelegate().UpdateConnectivityToast(this.reachable);}

现在如果我切换到飞行模式，回调会立即被调用并且标志参数为 0.然后，在它再次触发后不久，标志为

ConnectionRequired|IsWWAN|Reachable|TransientConnection

如果我关闭飞行模式，我会得到另一个 0，然后再得到 0

可达

如果我关闭 WiFi 并开启 3G，结果是:

IsWWAN|Reachable|TransientConnection

似乎仅检查 Reachable 是不够的.但这里的逻辑是什么?ConnectionRequired 和 TransientConnection 是什么意思?

解决方案

引用文档:

<块引用>

ConnectionRequired:可达，但必须先建立连接成立.

TransientConnection:可以使用瞬态访问主机连接(例如PPP).

Xamarin API 文档 和 iOS Lib Doc

但是你可能可以像下面的示例代码那样做:

https://github.com/xamarin/monotouch-样本/blob/master/ReachabilitySample/reachability.cs

它基本上检查 Reachable &&(!ConnectionRequired || IsWWAN).

I'm using NetworkReachability to figure out the connectivity status of my app:

NetworkReachability(this.currentHostUrl);
remoteHostReachability.SetNotification(this.ReachabilityChanged);
remoteHostReachability.Schedule(CFRunLoop.Current, CFRunLoop.ModeDefault);

The callback method looks like this:

void ReachabilityChanged(NetworkReachabilityFlags flags)
{
    this.reachable = (flags & NetworkReachabilityFlags.Reachable) > 0;
    UIHelpers.GetAppDelegate().UpdateConnectivityToast(this.reachable);
}

Now if I switch to airplane mode, the callback gets called immediately and the flags parameter is 0. Then, shortly after it triggers again and the flags are

ConnectionRequired|IsWWAN|Reachable|TransientConnection

If I turn airplane mode off, I get another 0 and then afterwards

Reachable

If I turn WiFi off and 3G kicks in, the result is:

IsWWAN|Reachable|TransientConnection

It seems like checking for Reachable alone is not enough. But what's the logic here? What do ConnectionRequired and TransientConnection mean?

解决方案

Quoting the documentations:

ConnectionRequired: Reachable, but a connection must first be established.

TransientConnection: The host is reachable using a transient connection (PPP for example).

Xamarin API Doc and iOS Lib Doc

But you probably can do it like the following sample code:

https://github.com/xamarin/monotouch-samples/blob/master/ReachabilitySample/reachability.cs

It basically checks if Reachable && (!ConnectionRequired || IsWWAN).

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