无法获取 NSDictionary 元素

Question

我从 NSUserDefaults 中获取词典字典：

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;
    }
}

这个小字典一定是一个 NSDictionary，但是当我在循环中获取日志时，我看到了以下内容：

不知道为什么，dict不是字典，只是一个字符串，怎么可能从那个大字典中取出字典，因为我的解决方案没有生命迹象(

dictionaryFromMemory 是字典的字典，它是这样创建和保存的：

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];

Answer 1

这个循环不正确：

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

dict 在此上下文中表示迭代中的当前 key，因此您看到 "com.ION.PSTutorial.b.SeriesAll".

的原因

更改循环以根据此键检索字典：

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下标语法。

无法获取 NSDictionary 元素

Can't get NSDictionary element

objective-c

nsdictionary

nsuserdefaults

ios