在 Objective C 中检查 Internet 连接 [英] Checking For Internet Connectivity in Objective C

问题描述

我一直在学习斯坦福 iPhone 编码课程，目前正在使用 Twitter API.我想做的是准确处理两种错误情况:一种是用户名无效时，另一种是设备当前未连接到互联网时.不幸的是，就目前而言，我所能猜测的最好结果是 API 的返回值是否为零 - 这两种情况都是如此.

I've been working through the Stanford iPhone Coding course and currently hooking into the Twitter API. What I'd like to do is accurately handle two error conditions: One for when the username is invalid, and another for when the device is not currently connected to the internet. Unfortunately, as it stands, the best I can surmise is whether or not the return from the API is nil or not - which is the case for both conditions.

我正在寻找的是一两行代码，可以在尝试获取任何远程数据之前检查连接.我可以仔细阅读 Apple 文档，但我想:为什么不为了我和其他人的利益向你们提出这个问题?

What I'm looking for is a line or two of code that can check for a connection before attempting any fetch of remote data. I could sift through the Apple documentation but I figured: Why not put the question to you guys for my benefit and perhaps that of others?

附加信息:在 XCode 中使用 Objective-C 和 iPhone SDK.

Additional info: Using Objective-C and the iPhone SDK in XCode.

推荐答案

查看 Apple 的示例代码.Reachability 项目展示了如何检测连接.

Take a look at Apple's sample code. The Reachability project shows how to detect a connection.

http://developer.apple.com/iphone/library/示例代码/Reachability/index.html

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