////  LWTViewController.m//  网络编程练习 -- 检测网络状态////  Created by apple on 14-7-2.//  Copyright (c) 2014年 lwt. All rights reserved.//#import "LWTViewController.h"#import "Reachability.h"@interface LWTViewController ()@property (nonatomic, strong) Reachability *wann;@end@implementation LWTViewController- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(networkStateChange) name:kReachabilityChangedNotification object:nil];        self.wann = [Reachability reachabilityForInternetConnection];        [self.wann startNotifier];    }- (void)dealloc{    [self.wann stopNotifier];    [[NSNotificationCenter defaultCenter] removeObserver:self];}- (void)networkStateChange{    // 1.检测wifi状态    Reachability *wifi = [Reachability reachabilityForLocalWiFi];        // 2.检测手机是否能上网络(WIFI\3G\2.5G)    Reachability *wann = [Reachability reachabilityForInternetConnection];        // 3.判断网络状态    if (wifi.currentReachabilityStatus != NotReachable) {        NSLog(@"有wifi");    }else if([wann currentReachabilityStatus] != NotReachable)    {        NSLog(@"使用手机自带网络进行上网");    }else    {        NSLog(@"没有网络");    }}- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{    // 1.检测wifi状态    Reachability *wifi = [Reachability reachabilityForLocalWiFi];        // 2.检测手机是否能上网络(WIFI\3G\2.5G)    Reachability *wann = [Reachability reachabilityForInternetConnection];        // 3.判断网络状态    if (wifi.currentReachabilityStatus != NotReachable) {        NSLog(@"有wifi");    }else if([wann currentReachabilityStatus] != NotReachable)    {        NSLog(@"使用手机自带网络进行上网");    }else    {        NSLog(@"没有网络");    }}@end