Ios Can'；无法获取NSDictionary元素

我从NSUserDefaults获得字典字典：

NSUserDefaults *def = [NSUserDefaults standardUserDefaults];
NSData *data = [def objectForKey:keyForMemory];
NSDictionary *retrievedDictionary = [NSKeyedUnarchiver unarchiveObjectWithData:data];
NSMutableDictionary * dictionaryFromMemory = [[[NSDictionary alloc] initWithDictionary:retrievedDictionary] mutableCopy];

int flag = 0;
for (NSDictionary * dict in dictionaryFromMemory) {
    if ([[dictionary objectForKey:@"purchaseId"] isEqualToString:[dict objectForKey:@"purchaseId"]]) {
        flag = 1;
    }
}

这个小词典一定是NSDictionary，但当我在循环中获取日志时，我看到了以下内容：

我不知道为什么，但dict不是一本字典，只是一个字符串，怎么可能从那本大字典中提取字典，因为我的解决方案没有生命迹象(

dictionaryFromMemory是一本字典字典，其创建和保存方式如下：

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

            NSDictionary * smallDict = [[NSDictionary alloc] initWithObjectsAndKeys:
                                        [dictionary objectForKey:@"purchaseId"], @"purchaseId",
                                        [dictionary objectForKey:@"price"], @"price",
                                        [dictionary objectForKey:@"enable"],@"enable",
                                        [dictionary objectForKey:@"lessons_number"],@"lessonNumber",
                                        [NSString stringWithFormat:@"0"], @"purchased",
                                        nil];

            [bigDict setObject:smallDict forKey:[dictionary objectForKey:@"purchaseId"]];


            NSMutableString * tempStr10 = [NSMutableString stringWithString:pairedData];

            NSUserDefaults *def = [NSUserDefaults standardUserDefaults];
            [def setObject:[NSKeyedArchiver archivedDataWithRootObject:bigDict] forKey:tempStr10];
            [def synchronize];

---

此循环不正确：

for (NSDictionary * dict in dictionaryFromMemory) {
    if ([[dictionary objectForKey:@"purchaseId"] isEqualToString:[dict objectForKey:@"purchaseId"]]) {
        flag = 1;
    }
}

在此上下文中，

dict

表示迭代中的当前键，因此您会看到“com.ION.PSTutorial.b.SeriesAll”

更改循环以基于此键检索字典：

for (id key in dictionaryFromMemory) {
    NSDictionary *dict = dictionaryFromMemory[key];
    if ([dictionary[@"purchaseId"] isEqualToString:dict[@"purchaseId"]]) {
        flag = 1;
    }
}

---

我还冒昧地将字典访问转换为使用现代订阅语法。

您没有提供足够的信息让我们帮助您。是什么让您认为该字典包含字符串而不是其他字典？在我看来，它就像一本字典字典。这本字典是如何创建的ed？你需要给我们看那段代码。@Duncac我编辑了这篇文章，并展示了这本词典是如何创建的。它遍历NSDictionary的键，键是一个NSString。要获得内部词典，你需要在截图

com.ION.PSTutorial.b.SeriesAll

中键的实际文字值