Question

升级到iOS 9.我的应用程序出现了一个奇怪的问题。

问题：每当网络可达性发生变化时，应用程序的视图就会冻结。它没有响应任何触摸事件。它也没有崩溃。我检查了日志。唯一的变化是网络可达性。

更多信息：

1）如果您退出应用程序并再次通过Internet在线打开，它运行正常。

2）如果我打开互联网离线的应用程序，视图会冻结。这在iOS 8.4中不会发生。

我正在使用Reachability by Tony million库来检查在线/离线状态。

升级到iOS 9后有没有人遇到过同样的问题？

参考代码：

self.appIsOnline = YES;
_reachability = [Reachability reachabilityWithHostName:@"www.google.com"];

__weak __typeof(self)weakSelf = self;
[_reachability setReachableBlock: ^(Reachability * reachability) {

    NSLog(@"Online");

    if (!weakSelf.appIsOnline)
    {
        weakSelf.appIsOnline = YES;
        weakSelf.willShowAlertView = YES;
        dispatch_async(dispatch_get_main_queue(), ^{
            CustomAlertView *alertView = [[CustomAlertView alloc] initWithTitle:@"Warning" andMessage:@"The internet connection appears to be online. The app will switch to online mode now" delegate:weakSelf withButtons:@[@"OK"]];
            alertView.shouldTapOutsideToClose = YES;
            [alertView showInView:MAIN_WINDOW];
        });
    }
}];
[_reachability setUnreachableBlock:^(Reachability * reachability) {

    NSLog(@"Offline");

    if (weakSelf.appIsOnline)
    {
        [[NSNotificationCenter defaultCenter] postNotificationName:OFFLINE_STATE_NOTIFICATION object:nil];
        weakSelf.appIsOnline = NO;
        dispatch_async(dispatch_get_main_queue(), ^{
            [[AppUtilities sharedUtilities] displayAlertViewWithTitle:@"Warning" andMessage:@"The internet connection appears to be offline. The app will switch to offline mode now"];
        });
    }
}];

[_reachability startNotifier];

看起来我的主UI线程被阻止，并且触发器正在关闭wi-fi。我的线程跟踪如下。

Thread 1Queue : com.apple.main-thread (serial)

#0  0x38739130 in mach_msg_trap ()
#1  0x38738f30 in mach_msg ()
#2  0x265624ec in __CFRunLoopServiceMachPort ()
#3  0x26560872 in __CFRunLoopRun ()
#4  0x264b31e8 in CFRunLoopRunSpecific ()
#5  0x264b2fdc in CFRunLoopRunInMode ()
#6  0x2f757af8 in GSEventRunModal ()
#7  0x2a71818c in UIApplicationMain ()
#8  0x00117f20 in main

Thread 3Queue : com.apple.libdispatch-manager (serial)

#0  0x3874e3c0 in kevent_qos ()
#1  0x0067d5f6 in _dispatch_mgr_invoke ()
#2  0x0066ea76 in _dispatch_mgr_thread ()

com.apple.NSURLConnectionLoader (11)

#0  0x38739130 in mach_msg_trap ()
#1  0x38738f30 in mach_msg ()
#2  0x265624ec in __CFRunLoopServiceMachPort ()
#3  0x26560872 in __CFRunLoopRun ()
#4  0x264b31e8 in CFRunLoopRunSpecific ()
#5  0x264b2fdc in CFRunLoopRunInMode ()
#6  0x25e240ae in +[NSURLConnection(Loader) _resourceLoadLoop:] ()
#7  0x273747fc in __NSThread__start__ ()
#8  0x387ebc92 in _pthread_body ()
#9  0x387ebc06 in _pthread_start ()
#10 0x387e9a24 in thread_start ()

AFNetworking (12)#0 0x38739130 in mach_msg_trap ()

#1  0x38738f30 in mach_msg ()
#2  0x265624ec in __CFRunLoopServiceMachPort ()
#3  0x26560872 in __CFRunLoopRun ()
#4  0x264b31e8 in CFRunLoopRunSpecific ()
#5  0x264b2fdc in CFRunLoopRunInMode ()
#6  0x272a3d7c in -[NSRunLoop(NSRunLoop) runMode:beforeDate:] ()
#7  0x272f28ec in -[NSRunLoop(NSRunLoop) run] ()
#8  0x00122a2e in +[AFURLConnectionOperation networkRequestThreadEntryPoint:] at /Pods/AFNetworking/AFNetworking/AFURLConnectionOperation.m:168
#9  0x273747fc in __NSThread__start__ ()
#10 0x387ebc92 in _pthread_body ()
#11 0x387ebc06 in _pthread_start ()
#12 0x387e9a24 in thread_start ()

com.apple.CFSocket.private (13)#0   0x3874cfb4 in __select ()

#1  0x26567990 in __CFSocketManager ()
#2  0x387ebc92 in _pthread_body ()
#3  0x387ebc06 in _pthread_start ()
#4  0x387e9a24 in thread_start ()

Answer 1

我终于找到了真正的问题。它不是可达性类。这是由于我的CustomAlertView。每当可达性发生变化时，我的应用程序会弹出一个提示离线/在线的警报。它直接在我的主窗口上显示警报视图，如下所示

[alertView showInView:MAIN_WINDOW];

其中

#define MAIN_WINDOW         [UIApplication sharedApplication].keyWindow

在iOS 9中，这是不允许的。当它试图显示时，UI线程暂停。我通过这样做来解决它

[alertView showInView:MAIN_WINDOW.rootViewController.view];

iOS 9 - 网络可访问性更改导致视图冻结 - 不是崩溃

1 个答案: