將字典詞典中的數據加載到目標C中的數組中，用於iphone應用程序

Question

我有一個包含tableview的UINavigationController我想要加載一些數據。 我有一個詞典plist包含每個火車線的字典，每個火車線又有字典爲每個站與相關信息以及一個字符串lineName。我需要收集站名稱鍵並將它們添加到數組來填充我的表（這是工作）。

線路名稱都存儲在我行一個字符串鍵值爲「lineName」

Root->| 
     | 
     |->TrainLine1(Dictionary)->| 
     |       |-> lineName (String) 
     |       |-> Station1 (Dictionary) 
     |       |-> Station2 (Dictionary) 
     | 
     | 
     |->TrainLine2(Dictionary)->| 
     |       |-> lineName (String) 
     |       |-> Station1 (Dictionary) 
     |       |-> Station2 (Dictionary) 

我要對這個錯誤的方式字典嗎？我應該重組我的plist嗎？ 下面的代碼崩潰了應用程序。

- (void)viewDidLoad { 
    NSString *path = [[NSBundle mainBundle] pathForResource:@"lineDetails" ofType:@"plist"]; 
    NSDictionary *dictionary = [[NSDictionary alloc] initWithContentsOfFile:path]; 
    NSDictionary *lineDictionary = [[NSDictionary alloc] initWithDictionary:[dictionary objectForKey:stationNameKey]]; 
    NSMutableArray *stationsOnLine = [[NSArray alloc] init]; 

    NSString *key; 

    for (key in lineDictionary) { 

     NSLog(@"Adding this in array:%@", key); 
     //NSString *key2; 
     NSString *nameToTry = [NSString stringWithString:key]; 
     NSLog(@"nameToTry : %@", nameToTry);  
     //NSMutableDictionary *stationDictionary = [[NSDictionary alloc] init]; 
     if (![key isEqualToString: @"lineName"]) 
     { 
      //NSMutableDictionary *stationDictionary = [[NSDictionary alloc] init]; 
      // NSLog(@"Yes"); 
      //NSMutableDictionary *tempDict = [[NSDictionary alloc] initWithDictionary:[lineDictionary objectForKey:key]]; 
      NSMutableDictionary *stationDictionary = [[NSDictionary alloc] initWithDictionary:[lineDictionary objectForKey:key]]; 
      //stationDictionary = tempDict; 
      NSLog(@"Object for key-- %@",[stationDictionary objectForKey:kStationName]); 
      [stationsOnLine addObject:[stationDictionary objectForKey:kStationName]]; 
      [stationDictionary release]; 
      //[tempDict release]; 
     } 
     /* 
     for (key2 in stationDictionary) 
     { 
      NSLog(@"Adding this in station array:%@", key); 
     } 
      */ 

    } 
    stationNames = stationsOnLine; 
    //[stationDictionary release]; 

    [stationsOnLine release]; 
    [lineDictionary release]; 
    [dictionary release]; 
} 

調試器控制檯輸出：

2010-03-31 00:42:39.842 AMT_Schedule[8395:207] did SelectRow Array contents:deux-montagnes 
2010-03-31 00:42:39.844 AMT_Schedule[8395:207] Adding this in array:sunnybrooke 
2010-03-31 00:42:39.844 AMT_Schedule[8395:207] nameToTry : sunnybrooke 
2010-03-31 00:42:39.845 AMT_Schedule[8395:207] Object for key-- Sunnybrooke 
2010-03-31 00:42:39.846 AMT_Schedule[8395:207] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '*** -[NSCFArray insertObject:atIndex:]: mutating method sent to immutable object' 
2010-03-31 00:42:39.847 AMT_Schedule[8395:207] Stack: (
    29320283, 
    2521638153, 
    29404219, 
    29404058, 
    107345, 
    107124, 
    17393, 
    3270466, 
    3263806, 
    3306080, 
    3302106, 
    3308563, 
    3289798, 
    3310951, 
    3289447, 
    15819, 
    3066438, 
    3049604, 
    303530, 
    29104832, 
    29101128, 
    37410325, 
    37410522, 
    2793391, 
    8628, 
    8482 
) 

Answer 1

NSMutableArray *stationsOnLine = [[NSArray alloc] init]; 

應該

NSMutableArray *stationsOnLine = [[NSMutableArray alloc] init]; 

它編譯很好，因爲與obj-C編譯器認爲這一個NSMutableArray，但指針實際上是一個NSArray實例，因此在運行時的發什麼「突變方法到不可變類型「的錯誤是全部。通常情況下，這會顯示爲「無法識別的選擇器」錯誤，但我認爲數組在內部處理的方式會導致出現另一個更隱蔽的錯誤消息。

Answer 2

您的代碼看起來沒什麼問題的，我（在for語句外部聲明的變量key是有點不尋常，但我不認爲它會炸燬） 。你不會說你看到了什麼樣的崩潰，但我能想到爲什麼代碼會崩潰的唯一原因是，如果其中一個方法返回nil的某處，然後nil作爲參數傳遞給一種不會接受的方法。也許你沒有從NSBundle獲得有效的路徑，也許NSDictionary沒有從路徑中正確創建，就像那樣。