Objective C - UserDefaults 重写

Question

我似乎无法在我的 ios 用户默认设置中重新编辑此对象。这是我的代码...

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setObject:nil forKey:@"savedScoreCards2"];

在我这样做之前，我将键 savedScoreCards 设置为一个巨大的 3-d 字典，现在当我尝试重写它甚至将键设置为 nil 时，我之前设置的那个巨大的 3-d 字典是还在那里。我似乎无法过度写入/替​​换它（零）或另一个巨大的 3-d 字典。有什么想法吗？

更新：

  + (void)saveCurrentScoreCard 
  {
    //save score card
    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    NSMutableDictionary *savedScoreCards = [[NSMutableDictionary alloc] init];
    [userDefaults setObject:nil forKey:@"savedScoreCards2"];//reset at beginning

    NSMutableArray *golferOneScoresu = [userDefaults arrayForKey:@"golferOneScoresArray"];
    NSMutableArray *golferTwoScoresu = [userDefaults arrayForKey:@"golferTwoScoresArray"];
    NSMutableDictionary *golferIconsu = [userDefaults objectForKey:@"golferIconsFirstScene"];
    NSMutableArray *golferThreeScoresu = [userDefaults arrayForKey:@"golferThreeScoresArray"];
    NSMutableArray *golferFourScoresu = [userDefaults arrayForKey:@"golferFourScoresArray"];
    NSMutableDictionary *golferIcons2u = [userDefaults objectForKey:@"golferIcons"];
    NSMutableArray *golferNamesu = [userDefaults objectForKey:@"golferNames"];

    NSMutableArray *golferNames = [[NSMutableArray alloc] initWithArray:golferNamesu copyItems:YES];
    NSMutableDictionary *golferIconsSceneOne = [[NSMutableDictionary alloc]initWithDictionary:golferIconsu];
    NSMutableDictionary *golferIcons = [[NSMutableDictionary alloc]initWithDictionary:golferIcons2u];
    NSMutableArray *golferFourScores = [[NSMutableArray alloc] initWithArray:golferFourScoresu copyItems:YES];
    NSMutableArray *golferThreeScores = [[NSMutableArray alloc] initWithArray:golferThreeScoresu copyItems:YES];
    NSMutableArray *golferOneScores = [[NSMutableArray alloc] initWithArray:golferOneScoresu copyItems:YES];
    NSMutableArray *golferTwoScores = [[NSMutableArray alloc] initWithArray:golferTwoScoresu copyItems:YES];

    NSMutableDictionary *currentScoreCard = [[NSMutableDictionary alloc] init];

    [currentScoreCard setObject:golferNames forKey:@"golferNames"];
    [currentScoreCard setObject:golferIconsSceneOne forKey:@"golferIconsFirstScene"];
    [currentScoreCard setObject:golferIcons forKey:@"golferIcons"];
    [currentScoreCard setObject:golferOneScores forKey:@"golferOneScoresArray"];
    [currentScoreCard setObject:golferTwoScores forKey:@"golferTwoScoresArray"];
    [currentScoreCard setObject:golferThreeScores forKey:@"golferThreeScoresArray"];
    [currentScoreCard setObject:golferFourScores forKey:@"golferFourScoresArray"];

    [savedScoreCards setObject:currentScoreCard forKey:@"1"];

    NSLog([golferIconsSceneOne objectForKey:@"30101"]);

    [userDefaults setObject:savedScoreCards forKey:@"savedScoreCards2"];
    [userDefaults synchronize];
    NSLog(@"SAVED SCORE CARD");
}

Answer 1

如果您只是想删除存储的值，请使用 [userDefaults removeObjectForKey:@"savedScoreCards2"]。 还请致电[userDefaults synchronize]; 立即“刷新”您的更改。我认为[userDefaults synchronize] 可能是您所缺少的。

Answer 2

当您对它们进行更改时，NSUserDefaults 不会自动保存。尝试在您上面发布的行下方添加此行：

[userDefaults synchronize];

这应该会保存您所做的任何更改。

附带说明，我不确定您是否可以将“nil”保存到 NSUserDefaults；我相信它的核心是一本字典，其中不能设置 nil 值。因此，您可以尝试设置一个空对象。

希望对您有所帮助，如果您需要更多信息，请告诉我！