更改 NSDictionary 中的键名 [英] changing a key name in NSDictionary

问题描述

我有一个方法可以返回一个带有特定键和值的 nsdictionary.我需要将字典中的键名更改为新的键名，但该键的值需要相同，但我被困在这里.需要帮助

I have a method which returns me a nsdictionary with certain keys and values. i need to change the key names from the dictionary to a new key name but the values need to be same for that key,but i am stuck here.need help

推荐答案

此方法仅适用于可变字典.如果新密钥已经存在，它不会检查应该做什么.

This method will only work with a mutable dictionary. It doesn't check what should be done if the new key already exists.

你可以通过调用 mutableCopy 来获取一个不可变的可变字典.

You can get a mutable dictionary of a immutable by calling mutableCopy on it.

- (void)exchangeKey:(NSString *)aKey withKey:(NSString *)aNewKey inMutableDictionary:(NSMutableDictionary *)aDict
{
    if (![aKey isEqualToString:aNewKey]) {
        id objectToPreserve = [aDict objectForKey:aKey];
        [aDict setObject:objectToPreserve forKey:aNewKey];
        [aDict removeObjectForKey:aKey];
    }
}

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