iOS网络状态监测-优快云博客

本文介绍了一个iOS应用中监测网络状态的方法，通过Reachability类来实时获取设备当前的网络连接情况，包括Wi-Fi和移动网络，并提供了不同的网络状态下的处理逻辑。

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