监测网络状态

监测网络状态

转自 http://www.cnblogs.com/wendingding/p/3950114.html#

有些许修改

#import "YYViewController.h"
#import "Reachability.h"

@interface YYViewController ()
@property (nonatomic, strong) Reachability *conn;
@end

@implementation YYViewController

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

　 [[NSNotificationCenter defaultCenter] postNotificationName:kReachabilityChangedNotification object:nil];//发通知（增加）
}

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

- (void)networkStateChange
{
    [self checkNetworkState];
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{

}

- (void)checkNetworkState
{
    // 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 *conn = [Reachability reachabilityForInternetConnection];
    
    // 3.判断网络状态
    if ([wifi currentReachabilityStatus] != NotReachable) { // 有wifi
        NSLog(@"有wifi");
        
    } else if ([conn currentReachabilityStatus] != NotReachable) { // 没有使用wifi, 使用手机自带网络进行上网
        NSLog(@"使用手机自带网络进行上网");
        
    } else { // 没有网络
        
        NSLog(@"没有网络");

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil
                                                        message:@"没有网络请检查网络设置"
                                                       delegate:nil
                                              cancelButtonTitle:@"确定"
                                              otherButtonTitles:nil];
        [alert show];
        alert = nil;
    }
}
@end

// 用WIFI
// [wifi currentReachabilityStatus] != NotReachable
// [conn currentReachabilityStatus] != NotReachable

// 没有用WIFI, 只用了手机网络
// [wifi currentReachabilityStatus] == NotReachable
// [conn currentReachabilityStatus] != NotReachable

// 没有网络
// [wifi currentReachabilityStatus] == NotReachable
// [conn currentReachabilityStatus] == NotReachable

这只是网络状态改变时就会检测到，但一开始就没网络的状态下需要自己判断再提示信息