好吧,我问了一个错误的问题,所以我编辑了原来的问题.
我在数组中存储数组,以及NSDictionaries.它是一种实用类型的应用程序,没有设置结构,用户可以根据需要输入嵌套信息.
理想情况下,我需要一个方法来给定一个set参数(一种类,可能是一个字典键)滚动我的数组的整个内容.这是一个例子..
NSMutableArray *array = [[NSMutableArray alloc]init]; NSMutableDictionary *enteredItem = [[NSMutableDictionary alloc]init]; [enteredItem setObject:@"i'm a title" forKey:@"title"]; [enteredItem setObject:@"i'm an id" forKey:@"id"]; [enteredItem setObject:@"i'm a description" forKey:@"description"]; [enteredItem setObject:@"i'm a timestamp" forKey:@"timestamp"]; [enteredItem setObject:array forKey:@"items"]; [array addObject:enteredItem]; [array addObject:anotherDictionary]; [array addObject:moreDictionaries];
所以在上面的例子中,我需要找到包含@“我是id”的字典(并返回它).
希望我的问题很明确.谢谢你尽你所能的帮助.
解决方法
递归方法是正确的,但是如果您还不知道递归,我不确定代码示例是否非常有用.这是一个有效的解决方案：
- (id)findObjectWithKey:(id)key inArray:(NSArray *)array
{
for (id object in array)
{
if ([object isKindOfClass:[NSArray class]])
{
return [self findObjectWithKey:key inArray:object];
}
else if ([object isKindOfClass:[NSDictionary class]])
{
return [self findObjectWithKey:key inDictionary:object];
}
}
return nil;
}
- (id)findObjectWithKey:(id)key inDictionary:(NSDictionary *)dict
{
for (id subKey in dict)
{
id object = [dict objectForKey:subKey];
if ([subKey isEqual:key])
{
return object;
}
else if ([object isKindOfClass:[NSArray class]])
{
return [self findObjectWithKey:key inArray:object];
}
else if ([object isKindOfClass:[NSDictionary class]])
{
return [self findObjectWithKey:key inDictionary:object];
}
}
return nil;
}
然后找到你的对象,只需说：
id object = [self findObjectForKey:@"title" inArray:array];
- (id)findKeyWithObject:(id)key inArray:(NSArray *)array
{
for (id object in array)
{
if ([object isKindOfClass:[NSArray class]])
{
return [self findKeyWithObject:key inArray:object];
}
else if ([object isKindOfClass:[NSDictionary class]])
{
return [self findKeyWithObject:key inDictionary:object];
}
}
return nil;
}
- (id)findKeyWithObject:(id)object inDictionary:(NSDictionary *)dict
{
for (id key in dict)
{
id subObject = [dict objectForKey:key];
if ([subObject isEqual:object])
{
return key;
}
else if ([subObject isKindOfClass:[NSArray class]])
{
return [self findKeyWithObject:object inArray:object];
}
else if ([subObject isKindOfClass:[NSDictionary class]])
{
return [self findKeyWithObject:object inDictionary:object];
}
}
return nil;
}
然后找到你的钥匙,只需说：
id key = [self findKeyWithObject:object inArray:array];