CTRadioAccessTechnologyDidChangeNotification到新的CTRadioAccessTechnologyDidChangeNotification将导致崩溃如下

Question

1. 如果注释掉代码＆＃34; dispatch_async＆＃34;它将导致[[CTTelephonyNetworkInfo alloc] init]崩溃为EXC_BAD_ACCESS;

2. 如果我不判断＆＃34; if（！networkInfo）＆＃34;而不是代码＆＃34; CTTelephonyNetworkInfo * networkInfo = networkInfo = [[CTTelephonyNetworkInfo alloc] init];＆＃34;会快速记忆！谢谢！

   viewdidload: [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(updateAppCellWithNetworkType:) name:CTRadioAccessTechnologyDidChangeNotification object:nil];
   
   - (void)updateAppCellWithNetworkType:(id)sender{
   
   **//dispatch_async(dispatch_get_main_queue(), ^{**
   
   NSString *type = nil;
   Reachability *currentReach = [Reachability reachabilityWithHostName:@"www.apple.com"];
   if (currentReach.isReachableViaWiFi) {
   type =  @"WiFi";
   }else{
   
   static CTTelephonyNetworkInfo *networkInfo = nil;
   
   **if (!networkInfo) {
       networkInfo = [[CTTelephonyNetworkInfo alloc]init];
   }**
   
   type =  [self getTelephonyNetworkTypeWithCTRadioAccessTechnology:networkInfo.currentRadioAccessTechnology];
   }
   }
   

Answer 1

建议不要从Notification observer方法创建CTTelephonyNetworkInfo对象。查看“了解您的电台”部分下的objc.io链接中提供的文档。

这可能会有所帮助，我有类似的经验，这样做可以解决这个问题。