好吧,我问错了问题,所以我编辑了原始问题。
我在数组中存储数组,以及 NSDictionaries。它是一种实用型应用程序,没有固定的结构,用户可以根据需要输入嵌套信息。
理想情况下,我需要一种方法来滚动浏览数组的全部内容,给定一个设置参数(一种类,可能是字典键)。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@“i'm an id”的字典(并返回它)。
希望我的问题很清楚。感谢您提供的任何帮助。
最佳答案
递归方法是正确的,但如果您还不知道递归,我不确定代码示例是否有帮助。这是一个可行的解决方案:
添加这些方法:
- (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;
}
然后要找到您的对象,只需说:
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,请改为:
- (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;
}
然后要找到您的 key ,只需说:
id key = [self findKeyWithObject:object inArray:array];
关于iphone - 在未知的 NSMutableArray 深度中搜索值,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9017197/