ios - 为可变字典中的键赋值

Question

我有一个适用于 iOS 应用的函数。 NSString value 和 key 包含值和键，但是它似乎没有分配给 NSMutableDictionary data 行 [data setValue:value forKey:key]

-(NSMutableDictionary *)parseCode:(NSString *)string{
    NSArray *array = [string componentsSeparatedByString:@"||"];
    NSMutableDictionary *data;
    for(id object in array){
        NSArray *objectAndKey = [object componentsSeparatedByString:@"::"];
        NSString *key =[objectAndKey objectAtIndex:0];
        NSString *value = [objectAndKey objectAtIndex:1];
        [data setValue:value forKey:key];
        [self alertMeWithString:[data valueForKey:key]];
    }
    return data;
}

Answer 1

您需要初始化和分配您的 NSMutableDictionary。

 NSMutableDictionary *data = [NSMutableDictionary dictionary];

或者您可以明确地使用

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