CTRadioAccessTechnologyDidChangeNotification新CTRadioAccessTechnologyDidChangeNotification会导致崩溃如下

Question

1. 如果注释掉的代码“dispatch_async”这将导致在碰撞[CTTelephonyNetworkInfo的alloc]初始化]为EXC_BAD_ACCESS;

2. 如果我不判断“if（！networkInfo）”而不是代码“CTTelephonyNetworkInfo * networkInfo = networkInfo = [[CTTelephonyNetworkInfo alloc] init];”将导致记忆快速！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

据表示，不创建从通知观察者方法CTTelephonyNetworkInfo对象。检查“Know Your Ra​​dio”部分下的objc.io链接中提供的文档。

这可能有帮助，我有类似的经历，并且这样做可以修复崩溃。