网络初见&网络监测

这里需要下载一个第三方

Reachability-master

大家可以百度一下

下载之后把

Reachability拖进来

具体代码如下

 #import "ViewController.h"
 #import "Reachability.h"

 @interface ViewController ()

 @property (nonatomic, strong) Reachability * reach;
 @end

 @implementation ViewController

 - (void)viewDidLoad {
     [super viewDidLoad];
     // Do any additional setup after loading the view, typically from a nib.

     //根据主机名判断网络是否连接
     self.reach=[Reachability reachabilityWithHostName:@"www.baidu.com"];
     //注册网络监听通知
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged) name:kReachabilityChangedNotification object:nil];
     //开启监听
     [self.reach startNotifier];
 }

 - (void)reachabilityChanged {

     switch (self.reach.currentReachabilityStatus) {
         case NotReachable:
             NSLog(@"没有网络");
             break;
         case ReachableViaWiFi:
             NSLog(@"WiFi网络");
             break;
         case ReachableViaWWAN:
             NSLog(@"移动蜂窝网");
             break;
         default:
             NSLog(@"未知网络");
             break;
     }

     }
 - (void)dealloc {

     //把当前的对象所有通知删除

     [[NSNotificationCenter defaultCenter]  removeObserver:self];
     [self.reach stopNotifier];
 }