iphone - 使用可达性类检查互联网连接时应用程序崩溃

Question

我正在使用这段代码来检查互联网连接，但我遇到了一个崩溃提示:+[Reachability reachabilityForInternetConnection]: unrecognized selector sent to class 0xcbe0c8

我已经导入了 Reachability .h/.m和系统配置框架。崩溃发生在行 self.internetRechable = [[Reachability reachabilityForInternetConnection] retain];

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkNetworkStatus:) name:kReachabilityChangedNotification object:nil];

    self.internetRechable = [[Reachability reachabilityForInternetConnection] retain];
    [self.internetRechable startNotifier];

    // check if a pathway to a random host exists
    self.hostReachable = [[Reachability reachabilityWithHostName: @"www.apple.com"] retain];
    [self.hostReachable startNotifier];

- (void) checkNetworkStatus:(NSNotification *)notice
{
    // called after network status changes

    NetworkStatus internetStatus = [self.internetRechable currentReachabilityStatus];
    switch (internetStatus)
    {
        case NotReachable:
        {
            NSLog(@"The internet is down.");
//            self.internetActive = NO;
            break;
        }
        case ReachableViaWiFi:
        {
            NSLog(@"The internet is working via WIFI.");
//            self.internetActive = YES;
            break;
        }
        case ReachableViaWWAN:
        {
            NSLog(@"The internet is working via WWAN.");
//            self.internetActive = YES;
            break;
        }
    }

    NetworkStatus hostStatus = [self.hostReachable currentReachabilityStatus];
    switch (hostStatus)
    {
        case NotReachable:
        {
            NSLog(@"A gateway to the host server is down.");
//            self.hostActive = NO;
            break;
        }
        case ReachableViaWiFi:
        {
            NSLog(@"A gateway to the host server is working via WIFI.");
//            self.hostActive = YES;
            break;
        }
        case ReachableViaWWAN:
        {
            NSLog(@"A gateway to the host server is working via WWAN.");
//            self.hostActive = YES;
            break;
        }
    }
}

Answer 1

确保您的 Reachability 版本为:2.2，如果您不使用 2.2，最近发生的一些变化可能会导致崩溃。

这里是 version2.2 的链接 Reachability.h和 Reachability.m

此外，如果它有帮助，这里是我用于同一任务的工作代码:。

在我的 appDidFinishLaunching 中(hostReachable 和 internetReachable 是我的应用委托(delegate)的 ivars):

//....
if ([[Reachability reachabilityWithHostName:@"google.com"] currentReachabilityStatus] == NotReachable) {
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkNetworkStatus:) name:kReachabilityChangedNotification object:nil];
    internetReachable = [[Reachability reachabilityForInternetConnection] retain];
    [internetReachable startNotifier];
    hostReachable = [[Reachability reachabilityWithHostName:@"google.com"] retain];
    [hostReachable startNotifier];
}

然后，回调:

- (void)checkNetworkStatus:(NSNotification *)notice {
    NetworkStatus internetStatus = [internetReachable currentReachabilityStatus];
    switch (internetStatus) {
        case NotReachable:
            self.internetActive = NO;
            break;
        case ReachableViaWiFi:
            self.internetActive = YES;
            break;
        case ReachableViaWWAN:
            self.internetActive = YES;
            break;
    }
    NetworkStatus hostStatus = [hostReachable currentReachabilityStatus];
    switch (hostStatus) {
        case NotReachable:
            self.hostActive = NO;
            break;
        case ReachableViaWiFi:
            self.hostActive = YES;
            break;
        case ReachableViaWWAN:
            self.hostActive = YES;
            break;
    }
    if (internetActive && hostActive) {
        [self refreshAllData];
    }
}