NSDictionary中的NSDictionary

Question

我有以下代码：

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSMutableDictionary *golferIconsu = [userDefaults objectForKey:@"golferIconsFirstScene"];

NSMutableDictionary *golferIconsSceneOne = [[NSMutableDictionary alloc]initWithDictionary:golferIconsu];

NSMutableDictionary *savedScoreCards;

NSMutableDictionary *currentScoreCard;
[currentScoreCard setObject:golferIconsSceneOne forKey:@"golferIconsFirstScene"];

NSMutableDictionary *GI = [currentScoreCard objectForKey:@"golferIconsFirstScene"];

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

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

最后，我的日志中打印出来的只是第一个NSLog调用，而不是第二个调用。例如：

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

这将打印出我存储在该字典中的字符串。

这一条：

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

根本不会打印出任何内容。

如何才能使NSDictionary GI具有与golferIconsSceneOne完全相同的属性，但我需要使用包含golferIconsSceneOne的currentScoreCardDictionary来完成此操作

Answer 1

在字典中设置object之前初始化字典。

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

Answer 2

像这样初始化一个并将其设置到另一个中

NSMutableDictionary *savedScoreCards = [[NSMutableDictionary alloc] init];
NSMutableDictionary *currentScoreCard = [[NSMutableDictionary dictionaryWithDictionary:savedScoreCards];