Reachability网络监控

1、#import "Reachability.h"//引头文件

2、[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotification object:nil];//注册通知，网络变动时会有回调

NSString *remoteHostName = @"www.apple.com";

self.hostReachability = [Reachability reachabilityWithHostName:remoteHostName];// 测试服务器状态

[self.hostReachability startNotifier];// 在当前程序的运行回路中开始监听网络请求可到达的通知

3、通知函数

- (void) reachabilityChanged:(NSNotification *)note

{

Reachability* curReach = [note object];

NSParameterAssert([curReach isKindOfClass:[Reachability class]]);

[self stringFromStatus:curReach.currentReachabilityStatus];

}

4、当前网络状况

-(NSString *)stringFromStatus:(NetworkStatus)status

{

NSString *string;

switch (status) {

case NotReachable:

string=@"无网络";

break;

case ReachableViaWiFi:

string=@"wifi环境";

break;

case ReachableViaWWAN:

string=@"移动网络";

break;

default:

string=@"未知";

break;

}

return string;

}