NSXMLParser未顯示錯誤日誌

如何在控制檯中捕獲NSXMLParser的錯誤？NSXMLParser未顯示錯誤日誌

我的項目正在使用官方的「LazyTableImages」。

問題是它不是一直在工作，表沒有得到任何價值。

這裏是香港專業教育學院做得到一些調試信息：

配售「的CachePolicy：0和timeoutInterval：160.0」，以避免網址超時：

NSURLRequest *urlRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:TopPaidAppsFeed] cachePolicy:0 timeoutInterval:160.0]

然後添加「的NSLog（@」的數據：％@「字符串）」來檢查，如果我有XML當期的：

NSXMLParser *parser = [[NSXMLParser alloc] initWithData:self.dataToParse]; 
NSString *string = [[NSString alloc] initWithData:self.dataToParse encoding:NSUTF8StringEncoding]; 
NSLog(@"data: %@", string); 
[parser setDelegate:self]; 
[parser parse];

控制檯顯示這些在XML開始和任何別的東西是好的就可以了：

2014-02-24 11:54:30.566 MyXMlParserTest[1419:1403] data: <?xml version="1.0" encoding="UTF-8"?>

後，我把這個parseError檢查錯誤，但沒有happend：

- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError 
{ 

    NSString * errorString = [NSString stringWithFormat:@"Unable to download data (Error code %i)",[parseError code]]; 

    UIAlertView * errorAlert = [[UIAlertView alloc] initWithTitle:@"Error loading content" message:errorString 
                 delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; 

    [errorAlert show]; 
}

然後我把「的NSLog（@」 nodeCount）」上connectionDidFinishLoading：

- (void)connectionDidFinishLoading:(NSURLConnection *)connection 
{ 
    self.appListFeedConnection = nil; // release our connection 

    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO; 

    // create the queue to run our ParseOperation 
    self.queue = [[NSOperationQueue alloc] init]; 

    // create an ParseOperation (NSOperation subclass) to parse the RSS feed data 
    // so that the UI is not blocked 
    ParseOperation *parser = [[ParseOperation alloc] initWithData:self.appListData]; 

    parser.errorHandler = ^(NSError *parseError) { 
     dispatch_async(dispatch_get_main_queue(), ^{ 
      [self handleError:parseError]; 
     }); 
    }; 

    // Referencing parser from within its completionBlock would create a retain 
    // cycle. 
    __weak ParseOperation *weakParser = parser; 

    parser.completionBlock = ^(void) { 
     if (weakParser.appRecordList) { 
      // The completion block may execute on any thread. Because operations 
      // involving the UI are about to be performed, make sure they execute 
      // on the main thread. 
      dispatch_async(dispatch_get_main_queue(), ^{ 
       // The root rootViewController is the only child of the navigation 
       // controller, which is the window's rootViewController. 
       RootViewController *rootViewController = (RootViewController*)[(UINavigationController*)self.window.rootViewController topViewController]; 

       rootViewController.entries = weakParser.appRecordList; 
       NSUInteger nodeCount = [rootViewController.entries count]; 
       NSLog(@"nodeCount: %lu", (unsigned long)nodeCount); 
       // tell our table view to reload its data, now that parsing has completed 
       [rootViewController.tableView reloadData]; 
      }); 
     } 

     // we are finished with the queue and our ParseOperation 
     self.queue = nil; 
    }; 

    [self.queue addOperation:parser]; // this will start the "ParseOperation" 

    // ownership of appListData has been transferred to the parse operation 
    // and should no longer be referenced in this thread 
    self.appListData = nil; 
}

和它返回：

014-02-24 11:54:30.582 MyXMlParserTest[1419:a0b] nodeCount: 0

從這一點我不在哪裏檢查。我在真實和模擬器設備上都嘗試了這一點，併發生了相同的結果。其中10個工作時間和表格填滿。另外9次沒有任何事情發生。 xml的字符串標記始終是相同的。只有圖片url標籤正在改變。

來源

2014-02-23 Andrey Markov

換款這一行後確定：

__weak ParseOperation *weakParser = parser;

到以下任一：

ParseOperation *weakParser = parser;

或

__block ParseOperation *weakParser = parser;

問題消失。

來源

2014-04-05 07:44:13

NSXMLParser未顯示錯誤日誌

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