iphone - 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"]);

最后在我的日志中打印出的是第一个 NSLog 调用，而不是第二个。例如:

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

这会打印出我存储在该字典中的字符串。

这个:

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

根本不打印任何东西。

如何让 NSDictionary GI 具有与 golferIconsSceneOne 完全相同的属性，但我需要使用 currentScoreCardDictionary 来做到这一点，其中包含 golferIconsSceneOne？

Answer 1

在设置对象之前初始化你的字典。

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