如果在後臺引發NSException會拋出應用程序

Question

我正在執行一些與網絡相關的代碼。當代碼開始執行並且用戶在後臺發送應用程序時，如果異常提示應用程序被終止。如果沒有提出異常，應用程序不會被殺死。是否有可能停止/暫停任何類型的網絡活動？或者阻止應用程序被殺的方法？

UPDATE

我使用書面uncaughtexception處理亞光gallahar（可可愛）。一旦它被解僱，我該如何取消這個請求。對於要求輸入密碼在此功能

+(NSString*)validate:(NSString*)username password:(NSString*)password server:(NSString*)server port:(int)port encryption:(int)encryption authentication:(int)authentication folders:(NSMutableArray*)folders { 
    CTCoreAccount* account = [[CTCoreAccount alloc] init]; 

    @try { 
     [account connectToServer:server port:port connectionType:encryption authType:authentication login:username password:password]; 
    } @catch (NSException *exp) { 
     NSLog(@"connect exception: %@", exp); 
     return [NSString stringWithFormat:@"Connect error: %@", [ImapFolderWorker decodeError:exp]]; 
    } 
} 


- (void)connectToServer:(NSString *)server port:(int)port 
     connectionType:(int)conType authType:(int)authType 
     login:(NSString *)login password:(NSString *)password { 
    int err = 0; 
    int imap_cached = 0; 

    const char* auth_type_to_pass = NULL; 
    if(authType == IMAP_AUTH_TYPE_SASL_CRAM_MD5) { 
     auth_type_to_pass = "CRAM-MD5"; 
    } 

    err = imap_mailstorage_init_sasl(myStorage, 
            (char *)[server cStringUsingEncoding:NSUTF8StringEncoding], 
            (uint16_t)port, NULL, 
            conType, 
            auth_type_to_pass, 
            NULL, 
            NULL, NULL, 
            (char *)[login cStringUsingEncoding:NSUTF8StringEncoding], (char *)[login cStringUsingEncoding:NSUTF8StringEncoding], 
            (char *)[password cStringUsingEncoding:NSUTF8StringEncoding], NULL, 
            imap_cached, NULL); 

    if (err != MAIL_NO_ERROR) { 
     NSException *exception = [NSException 
       exceptionWithName:CTMemoryError 
       reason:CTMemoryErrorDesc 
       userInfo:nil]; 
     [exception raise]; 
    } 

    err = mailstorage_connect(myStorage); 
    if (err == MAIL_ERROR_LOGIN) { 
     NSException *exception = [NSException 
       exceptionWithName:CTLoginError 
       reason:CTLoginErrorDesc 
       userInfo:nil]; 
     [exception raise]; 
    } 
    else if (err != MAIL_NO_ERROR) { 
     NSException *exception = [NSException 
       exceptionWithName:CTUnknownError 
       reason:[NSString stringWithFormat:@"Error number: %d",err] 
       userInfo:nil]; 
     [exception raise]; 
    } 
    else  
     connected = YES; 
} 

被稱爲異常發生。如果我進入不同的端口號時異常在下面的行

NSException *exception = [NSException 
        exceptionWithName:CTUnknownError 
        reason:[NSString stringWithFormat:@"Error number: %d",err] 
        userInfo:nil]; 
      [exception raise]; // this line kills the app if the app is in background. 

這些功能在MailCore圖書館提高。現在如果有人知道解決方案，請幫助我。

Answer 1

您是否爲應用程序註冊了uncaughtExceptionHandler？另外，Apple建議您在關閉之前取消任何開放式網絡請求（或至少爲其失敗做好準備）（使用- (void)applicationDidEnterBackground:(UIApplication *)application）。請參閱此鏈接的「作爲負責任的後臺應用程序」部分：https://developer.apple.com/library/ios/DOCUMENTATION/iPhone/Conceptual/iPhoneOSProgrammingGuide/ManagingYourApplicationsFlow/ManagingYourApplicationsFlow.html#//apple_ref/doc/uid/TP40007072-CH4-SW47