我正在使用这个库:https://github.com/tonymillion/Reachability

问题有时出现在我检查以下表达式时: [[[ReachabilityManager sharedManager] reachability] isReachable]; 在应该为 YES 时返回 NO。我知道有互联网，因为我同时调用了 Rest 服务。

另外，如果我执行 [Reachability reachabilityWithHostname:@"www.google.com"]; 并请求方法 isReachable 然后按我的预期工作。

我的测试很简单，在模拟器上试一下，然后插拔网线。

@implementation ReachabilityManager

#pragma mark -
#pragma mark Default Manager
+ (ReachabilityManager *)sharedManager {
    static ReachabilityManager *_sharedManager = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        _sharedManager = [[self alloc] init];
    });

    return _sharedManager;
}

#pragma mark -
#pragma mark Memory Management
- (void)dealloc {
    // Stop Notifier
    if (_reachability) {
        [_reachability stopNotifier];
    }
}

#pragma mark -
#pragma mark Class Methods
+ (BOOL)isReachable {
    return [[[ReachabilityManager sharedManager] reachability] isReachable];
}

+ (BOOL)isUnreachable {
    return ![[[ReachabilityManager sharedManager] reachability] isReachable];
}

+ (BOOL)isReachableViaWWAN {
    return [[[ReachabilityManager sharedManager] reachability] isReachableViaWWAN];
}

+ (BOOL)isReachableViaWiFi {
    return [[[ReachabilityManager sharedManager] reachability] isReachableViaWiFi];
}

#pragma mark -
#pragma mark Private Initialization
- (id)init {
    self = [super init];

    if (self) {
        // Initialize Reachability
        self.reachability = [Reachability reachabilityWithHostname:@"www.google.com"];

        // Start Monitoring
        [self.reachability startNotifier];
    }

    return self;
}

@end

最佳答案

@property (nonatomic) Reachability *hostReachability;
@property (nonatomic) Reachability *internetReachability;
@property (nonatomic) Reachability *wifiReachability;

声明一个 bool 值，

BOOL _isInternetAvaliable;

初始化可达性，

-(void) initializeReachability {
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotification object:nil];

    //hostReachability
    NSString *remoteHostName = @"www.apple.com";
    self.hostReachability = [Reachability reachabilityWithHostName:remoteHostName];
    [self.hostReachability startNotifier];
    [self updateInterfaceWithReachability:self.hostReachability];

    //internetReachability
    self.internetReachability = [Reachability reachabilityForInternetConnection];
    [self.internetReachability startNotifier];
    [self updateInterfaceWithReachability:self.internetReachability];

    //wifiReachability
    self.wifiReachability = [Reachability reachabilityForLocalWiFi];
    [self.wifiReachability startNotifier];
    [self updateInterfaceWithReachability:self.wifiReachability];

}


- (void)updateInterfaceWithReachability:(Reachability *)reachability
{
    if (reachability == self.hostReachability)
    {
        [self configurereachability:reachability];
    }

   if (reachability == self.internetReachability)
   {
       [self configurereachability:reachability];
   }

   if (reachability == self.wifiReachability)
   {
       [self configurereachability:reachability];
   }
}


- (void)configurereachability:(Reachability *)reachability
    {
    NetworkStatus netStatus = [reachability currentReachabilityStatus];
    BOOL connectionRequired = [reachability connectionRequired];

    switch (netStatus)
    {
        case NotReachable:        {
            _isInternetAvaliable = NO;
            break;
        }

        case ReachableViaWWAN:        {
            _isInternetAvaliable = YES;
           break;
        }
        case ReachableViaWiFi:        {
            _isInternetAvaliable = YES;
            break;
        }
    }

    if (connectionRequired)
    {
        _isInternetAvaliable = NO;
    }
}


-(BOOL) isInternetAvailable {
    return _isInternetAvaliable;
}

现在您可以打电话和访问互联网状态了，

if([[ReachabilityManager sharedManager] isInternetAvailable]){
  //Internet on
}

关于iOS - 可达性 isReachable 不工作，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/42203724/