1. 首先 下載Reachability.zip

2. 解壓之后將Reachability.h和Reachability.m文件拖入自己的項(xiàng)目中

3. 在AppDelegate.m中引入Reachability.h

4. 在- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(nullable NSDictionary *)launchOptions NS_AVAILABLE_IOS(3_0);方法里添加觀察者監(jiān)聽網(wǎng)絡(luò)狀態(tài)改變的通知

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // 監(jiān)聽網(wǎng)絡(luò)狀態(tài)改變
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(networkStateChange) name:kReachabilityChangedNotification object:nil];
    // 創(chuàng)建Reachability
    Reachability *connect = [Reachability reachabilityForInternetConnection];
    // 開始監(jiān)控網(wǎng)絡(luò),若網(wǎng)絡(luò)狀態(tài)改變, 就會發(fā)出通知kReachabilityChangedNotification
    [connect startNotifier];
    return YES;
  }




// 處理網(wǎng)絡(luò)狀態(tài)改變
- (void)networkStateChange
{
    
    Reachability *reachability = [Reachability reachabilityWithHostName:@"www.apple.com"];
    switch ([reachability currentReachabilityStatus]) {
        case 0://沒有網(wǎng)
            [[[UIAlertView alloc] initWithTitle:@"網(wǎng)絡(luò)連接異常" message:nil delegate:nil cancelButtonTitle:@"確定" otherButtonTitles:nil] show];
        case 1:
            NSLog(@"WIFI網(wǎng)絡(luò)");
            break;
        case 2:
            NSLog(@"手機(jī)自帶網(wǎng)絡(luò)");
            break;
        default:
            break;
    }
}