IOS开发—网络监听

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网络监听用到的类为Reachability.h,这个Xcode项目里面是不自带的,需要从github上面下载,在使用的时候记着导入SystemConfiguration.framework。

首先是在AppDelegate.m中设置网络监听

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

初始化:

_reachability = [Reachability reachabilityForInternetConnection];
[_reachability startNotifier];
[self updateInterfaceWithReachability:_reachability];
实现两个方法:
- (void) reachabilityChanged: (NSNotification* )note;//网络连接改变
- (void) updateInterfaceWithReachability: (Reachability*) curReach;//处理连接改变后的情况
下面是方法的具体实现,可根据情况自行改变:
// 连接改变
- (void) reachabilityChanged: (NSNotification* )note {
    Reachability* curReach = [note object];
    NSParameterAssert([curReach isKindOfClass: [Reachability class]]);
    [self updateInterfaceWithReachability: curReach];
}

//处理连接改变后的情况
- (void) updateInterfaceWithReachability: (Reachability*) curReach {
    //对连接改变做出响应的处理动作。
    NetworkStatus status = [curReach currentReachabilityStatus];
    
    if (status == NotReachable) {
        _isReachable = NO;
        //没有连接到网络就弹出提实况
        UIAlertView *netAlert = [[UIAlertView alloc] initWithTitle:@"蜂窝移动数据已关闭" message:@"启用蜂窝移动数据或无线局域网来访问数据" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil];
        [netAlert show];
    } else {
        _isReachable = YES;
    }
}