使用ASIHTTPRequest的可达性 [英] Using ASIHTTPRequest's Reachability
问题描述
我开始在我的iOS项目中使用可达性来测试是否存在互联网连接.
我的应用程序包含一个带有3个不同选项卡的UITabBarController.每个选项卡的根都是不同的UIViewController.在每个控制器中，我都会根据用户的操作发出多个请求.
我的问题是如何创建全局功能(或宏)以在使用Internet连接的每个功能之前使用，而不在每个控制器中都重写此功能.
是否可能具有执行此功能的功能?我看到有一种方法可以使应用程序根据网络状态发送通知.但是看这个例子:
- 用户点击
UIButton - 网络可用，请求开始.
- 如果网络中断，如何停止请求并显示例如
UIAlertView?
我搜索的很好，但是谢谢，我找不到我的问题的答案.
在提出网络请求之前，不应使用可访问性来检测网络是否可用，因为发出网络请求的行为会在需要时启动网络.可达性仅应用于检测网络不可用后何时可用.
只需尝试发出网络请求-如果网络不可用，您将收到一条错误消息.通常，响应会立即返回，但是如果网络不完整，则可能需要一段时间，因此您永远不应在主线程上进行同步网络调用.如果可能的话，请使用NSURLConnection，并且在发生某些情况时会得到回调.
I'm begin to use Reachability in my iOS project to test if there's internet connection or not.
My app consists in a UITabBarController with 3 different tabs. Each tab's root is a different UIViewController. In each controller I make several requests relying on user's actions.
My question is how to create a global function (or a macro) to use before each function that uses internet connection without rewriting this function in every controller.
Is possible to have a function that does this? I saw that there's a way to make the app sends notification relying on network status. But look at this example:
- The user tap a
UIButton - Network is available and the request starts.
- If network goes down, how to stop the request and display for example a
UIAlertView?
I've searched well but I can't find answers to my questions, thanks.
Reachability should not be used to detect if the network is available before making a network request because the act of making a network request can bring up the network if needed. Reachability should only be used to detect when the network becomes available after being unavailable.
Just try making the network request -- you'll get an error back if the network is unavailable. Usually the response will come back right away, but if the network is spotty it can take a while, so you shouldn't ever make synchronous network calls on the main thread. Use NSURLConnection if possible and you'll get callbacks when something happens.
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