不断聆听互联网可达性？

Question

我了解如何在我的应用中测试互联网可访问性，但我需要做的是在整个应用范围内不断监听可访问性。因此，如果应用程序中任何一点的连接状态发生变化，我都可以做出反应。

我将如何实现这样的目标？

Answer 1

您需要为可达性更改通知添加观察者：

首先在你的类中导入：#import "Reachability.h"

然后添加观察者：

   [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(reachabilityChanged:)
                                                 name:kReachabilityChangedNotification
                                               object:nil];


-(BOOL)reachabilityChanged:(NSNotification*)note
{
    BOOL status =YES;
    NSLog(@"reachabilityChanged");

    Reachability * reach = [note object];

    if([reach isReachable])
    {
        //notificationLabel.text = @"Notification Says Reachable"
        status = YES;
        NSLog(@"NetWork is Available");
    }
    else
    {
        status = NO;
        UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"You are not connected to the internet" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
    }
    return status;
}