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在iphone应用程序的objective c中将字典中的数据加载到数组中

nsdictionary nsarray uinavigationcontroller objective-c iphone

Khat · 技术社区 · 14 年前

我有一个uinavigationcontroller,它包含一个要加载一些数据的tableview。我有一个字典plist,它包含每一条列车线的字典,而每一个车站的字典又包含相关信息和一个字符串行名。我需要收集station names键并将它们添加到数组中以填充我的表(这正在工作)。

行名作为字符串存储在“我的行”字典中,键为“行名”

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

我是不是走错了路?我应该重组我的公司吗? 下面的代码使应用程序崩溃。

- (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];
 }

调试器控制台输出:

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
)

2 回复 | 直到 14 年前

Ian Henry 14 年前

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

应该是

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

它编译得很好,因为obj-c编译器认为 NSMutableArray ,但指针实际上指向 NSArray 实例,所以在运行时这就是“mutating method sent to immutable type”错误的意义所在。通常这会显示为一个“无法识别的选择器”错误,但我认为数组的内部处理方式会导致另一个更为神秘的错误消息。

Chuck 14 年前

你的代码在我看来都很好 key 在 for 声明有点不寻常,但我不认为会爆炸)。你不会说你看到了什么样的崩溃,但我能想到的唯一原因是,如果其中一个方法在某一行返回nil,然后nil作为参数传递给一个不接受它的方法。可能您没有从nsbundle获取有效的路径,或者nsdictionary没有从该路径正确创建,诸如此类。