如何更新NSUserDefault

我有以下代码,可以更新NSUserDefaults中的值:

- (id) createBoardWithTitle:(NSString *)pTitle withScores:(NSArray *)pScores andNames:(NSArray *)pNames andDisplayStrings:(NSArray *)pStrings orderBy:(NSString *)pOrder ofType:(NSString *)pType
{

    if((self == [super init]))
    {

        boardEntries = [NSMutableArray arrayWithCapacity:10];

        // Build the data

            for(...){
               // populate boardEntries
            }


        // create an Dictionary to save
        NSDictionary *savedData = [NSDictionary dictionaryWithObjectsAndKeys:pType, @"type", pOrder, @"order", boardEntries, @"entries", nil];

            // Load the old boards
        NSDictionary *existingBoards = [[NSUserDefaults standardUserDefaults] objectForKey:@"BlockDepotLeaderboards"];

            // Create a mutable dictionary to replace the old immutable dictionary
        NSMutableDictionary *newBoards = [NSMutableDictionary dictionaryWithCapacity:[existingBoards count]+1];

            // transfer the old dictionary into the new dictionary
        [newBoards addEntriesFromDictionary:existingBoards];

            // add the new board to the new dictionary
        [newBoards setObject:savedData forKey:pTitle];

            // check to make sure it looks like it should by eye
        NSLog(@"New Boards: %@", newBoards);

            // Replace the old date in NSUserdefaults
        [[NSUserDefaults standardUserDefaults] setObject:newBoards forKey:@"BlockDepotleaderboards"];
            // Update: Do I really need to call this?
        [[NSUserDefaults standardUserDefaults] synchronize];

            // Check to make sure it looks as it should by eye
        NSLog(@" Defaults--- %@", [[NSUserDefaults standardUserDefaults] objectForKey:@"BlockDepotLeaderboards"]);
    }

    return self;

}

NSLog(@“新板:%@”,newBoards)id的输出

New Boards: {
    "Marathon: Times" =     {
        entries =         (
                        {
                displayString = "10:00";
                name = "Tom Elders";
                score = 600;
            },
                        {
                displayString = "10:30";
                name = "A.R. Elders";
                score = 630;
            },
                        {
                displayString = "11:00";
                name = "L. Lancaster-Harm";
                score = 660;
            },

            // and so on.....

        );
        order = ASC;
        type = TIMES;
    };
    String = Test;
}

if(![[NSUserDefaults standardUserDefaults] objectForKey:@"BlockDepotLeaderboards"]){

    NSMutableDictionary *leadboardHolder = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"Test", @"String", nil];      
    [[NSUserDefaults standardUserDefaults] setObject:leadboardHolder forKey:@"BlockDepotLeaderboards"];
    [[NSUserDefaults standardUserDefaults] synchronize];



}else{
    NSLog(@"Leaderboards Dict Exists %@", [NSUserDefaults standardUserDefaults]);
}

所以我知道我所追求的肯定是存在的。我只知道我会错过一些愚蠢的事情。但我看不见也弄不明白。