ios - 数据在 iOS 中以无序方式插入

Question

我正在尝试通过从 plist 中获取样本数据来将其插入到核心数据中。但该数据并未以有序方式插入。

Below is my plist structure.

Below is the code which I tried.

NSArray *aArray = [NSArray arrayWithContentsOfFile:[[NSBundle mainBundle]pathForResource:@"SampleData" ofType:@"plist"]];

    for (NSDictionary *aDict in aArray ) 
    {

        [aDict enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop)
        {
            //--- UPDTATE -->>
            // while debugging I found one issue that -  
            //Here "obj" has three array - Sample List 1C,Sample List 1A,Sample List 1B
            // This should be Sample List 1A,Sample List 1B,Sample List 1C

            NSDictionary *aSubDict = (NSDictionary *)obj;
            NSMutableArray *aMutCheckpoint = [NSMutableArray array];

            //.… below is my logic for core data insertion…

        }]; 
    }

任何人都可以建议我在插入数据时如何在此处获取有序值的方法。

Answer 1

如果您想以固定顺序从 NSDictionary 中检索值，那么您需要对用于检索这些值的键进行排序。这是因为字典基本上是无序的数据结构。

所以这是一种方式(还有其他方式对键进行排序):

for (NSDictionary *aDict in aArray) 
{
    NSArray *sortedKeys = [[aDict allKeys] sortedArrayUsingSelector:@selector(compare:)];
    for (NSString *key in sortedKeys)
    {        
        id obj = aDict[key];
        // etc.
    }
}