网络监测 一

首先导入 AFNetworkReachabilityManager.h

#pragma mark -- 检查网络状态
- (void)checkNetworking{

//   1.创建对象
 AFNetworkReachabilityManager *manager = [AFNetworkReachabilityManager sharedManager];//   2.检查网络
 //设置网络状态发生改变触发的block
    [manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
 
/*
         AFNetworkReachabilityStatusUnknown          = -1, 未知
         AFNetworkReachabilityStatusNotReachable     = 0, 不可用
         AFNetworkReachabilityStatusReachableViaWWAN = 1, 流量
         AFNetworkReachabilityStatusReachableViaWiFi = 2, wifi
         */

 NSArray *array = @[@"未知错误", @"无网络", @"使用流量", @"wifi环境"];
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"网络状态检查” message:array[status + 1] preferredStyle:UIAlertControllerStyleAlert];
       
UIAlertAction *action = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction*action) {
            [alert dismissViewControllerAnimated:YES completion:ni];
        }];
        [alert  addAction:action];
        [self presentViewController:alert animated:YES completion:nil];
    }];
//    开始检查
    [manager startMonitoring];
//    停止检查
//    [manager stopMonitoring];

}

网络监测 二

https://github.com/tonymillion/Reachability

或者 在终端 git clone https://github.com/tonymillion/Reachability.git

导入 #import "Reachability.h"

#pragma mark 添加网络监控通知
    [[NSNotificationCenter defaultCenter] addObserver:self
     
                                             selector:@selector(reachabilityChanged:)
     
                                                 name:kReachabilityChangedNotification
     
                                               object:nil];
    
    Reachability *reach = [Reachability reachabilityWithHostName:@"公司网址头"];
    //例如 www.baidu.com
    [reach startNotifier];

#pragma mark 实现网络监控方法
-(void)reachabilityChanged:(NSNotification *)notification
{
    Reachability *reach = [notification object];
    
    if([reach isKindOfClass:[Reachability class]]){
        
        NetworkStatus statuWetwork = [reach currentReachabilityStatus];
        
        NSLog(@"statuWetwork  %ld",(long)statuWetwork);
        switch (statuWetwork) {
            case 0:
            {
                //提示网络不可用
            }
                break;
                
            default:
                break;
        }
        //Insert your code here
        
    }
}

仅供参考