iOS / xcode / objective-c：创建会话变量以实现可达性

Question

I do a test in app delegate using the reachability class to see if there is an Internet connection. I put this in app delegate since I need to check Internet access in many parts of the app at many points and thought app delegate is always running in background..

I created a boolean variable hasInternet in app delegate but can't seem to access it elsewhere. The following in another class throws error:

     if (hasInternet) {
//do something
        }

Is this the right approach to keeping track of reachability or how can I set a variable that can be checked throughout the entire app.

Answer 1

This is a valid option, but to use this variable you have to declare it as a property (possibly only read-only in .h, and read-write in .m). You can then access it in other classes with

((AppDelegate *)[UIApplication sharedApplication].delegate).hasInternet

_{(where AppDelegate is the actual name of your app delegate class)}