搜索未知NSMutableArray深度的值 [英] Searching for a value in an unknown NSMutableArray depth
问题描述
好吧,我问了一个错误的问题,所以我已经编辑了原始问题.
Ok, i kind of asked the wrong question so I've edited the original question.
我正在将数组以及NSDictionaries存储在数组中.这是一种实用程序,没有设置结构,用户可以根据需要输入嵌套信息.
I'm storing Arrays within Arrays, as well as NSDictionaries. It's a utility kind of application and there is no set structure, the user can enter nested information as much as they require.
理想情况下,我需要一个方法来滚动给定设置参数(某种类型的类,也许是字典键)的数组的所有内容.这是一个例子.
Ideally I need a method to scroll through the entire contents of my array given a set parameter (a type of class, maybe a dictionary key). Here's an example..
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];
因此,在上面的示例中,我需要找到包含@我是ID"的字典(并将其返回).
希望我的问题很清楚.感谢您提供的任何帮助.
Hopefully my question is clear. Thanks for any help you can offer.
推荐答案
递归方法是正确的,但是如果您不知道递归,我不确定代码示例是否很有用.这是一个可行的解决方案:
Recursive approach is correct, but I'm not sure the code samples were very helpful if you don't already know recursion. Here's a working solution:
添加以下方法:
- (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;
}
然后找到您的对象,只需说:
Then to find your object, just say:
id object = [self findObjectForKey:@"title" inArray:array];
要修改查找特定对象并返回字典键的方法,请执行以下操作:
To modify the methods to find a specific object and return the dictionary key, do this instead:
- (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;
}
然后找到您的钥匙,只需说:
Then to find your key, just say:
id key = [self findKeyWithObject:object inArray:array];
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