检查网络状态—实时监测

//
//  ViewController.m
//  检查网络状态

/*
 Reachability依赖于SystemConfiguration.framework这个框架
 并且是非ARC的。所以需要在 Build Phases-Compile Soures-Reachability.m下
 双击添加：-fno-objc-arc
 */

#import "ViewController.h"
#import "Reachability.h"
@interface ViewController ()
@property(nonatomic,strong) Reachability *conn;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(networkStateChange) name:kReachabilityChangedNotification object:nil];
     self.conn = [Reachability reachabilityForInternetConnection];
    [self.conn startNotifier];
}

- (void)dealloc
{
    [self.conn stopNotifier];
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

/**
 *  网络状态改变的通知
 */
- (void)networkStateChange
{
//    NSLog(@"networkStateChange");
    [self checkNetworkState];
}

/**
 *  检测网络状态
 */
- (void)checkNetworkState
{
    //1.检测WIFI状态
    Reachability  *wifi = [Reachability reachabilityForLocalWiFi];
    
    //2.检测手机是否能上网(wifi/3G/2.5G)
    Reachability  *conn = [Reachability reachabilityForInternetConnection];
    
    if ([wifi currentReachabilityStatus] != NotReachable) {
        NSLog(@"有wifi");
    }else if ([conn currentReachabilityStatus] != NotReachable){
        //没有wifi
        NSLog(@"使用手机自带网络进行上网");
    }else{
        NSLog(@"没有网络");
    }
}



@end