CTRadioAccessTechnologyDidChangeNotification新CTRadioAccessTechnologyDidChangeNotification會導致崩潰如下

Question

1. 如果註釋掉的代碼「dispatch_async」這將導致在碰撞[CTTelephonyNetworkInfo的alloc]初始化]爲EXC_BAD_ACCESS;

2. 如果我不判斷「if（！networkInfo）」而不是代碼「CTTelephonyNetworkInfo * networkInfo = networkInfo = [[CTTelephonyNetworkInfo alloc] init];」將導致記憶快速！謝謝！

   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

據表示，不創建從通知觀察者方法CTTelephonyNetworkInfo對象。檢查「Know Your Ra​​dio」部分下的objc.io鏈接中提供的文檔。

這可能有幫助，我有類似的經歷，並且這樣做可以修復崩潰。