可可中的双向映射 [英] Bidirectional Map in Cocoa

问题描述

Cocoa提供了NSDictionary，它本质上是一个关联数组。

有一个很好的方法来获得双向关联性？也就是说，如果NSDictionary有一个 keyForObject：方法，它镜像了 objectForKey：的行为。 >

我真的不在乎如果NSDictionary不是得到这个的方式。我知道NSDictionary 提供 keysOfEntriesPassingTest：但它返回一个 NSSet *

这里是一个例子：

  fieldMap = [[NSDictionary alloc] initWithObjectsAndKeys：
 @c0，@synckey，
 @c1，@wi_id，
 @ c2，@wi_parent_id，
 @c3，@wi_type，
 @c4，@wi_rh_task，
 @c5 
 @c6，@wi_stat，
 @c7，@wi_prio，
 @c8，@wi_cd，
 @c9 ，@wi_ct，
 @cb，@wi_dh_stat，
 @cc，@wi_user，
 nil]; 
  

我要在 c0 和 synckey davedelong / CHDataStructuresrel =nofollow noreferrer> CHDataStructures 框架具有 CHBidirectionalDictionary 。

Cocoa provides NSDictionary, which essentially is an associative array.

Is there a nice way to get bidirectional associativity? i.e. one way would have been if NSDictionary had a keyForObject: method which mirrored the behavior of objectForKey:.

I don't really care if NSDictionary is not the way to get this. I know NSDictionary does provide keysOfEntriesPassingTest: but it returns an NSSet * which doesn't look very clean for the kind of thing I want to have.

Here is an example:

fieldMap = [[NSDictionary alloc] initWithObjectsAndKeys:
    @"c0",@"synckey",
    @"c1",@"wi_id",
    @"c2",@"wi_parent_id",
    @"c3",@"wi_type",
    @"c4",@"wi_rh_task",
    @"c5",@"decision_key",
    @"c6",@"wi_stat",
    @"c7",@"wi_prio",
    @"c8",@"wi_cd",
    @"c9",@"wi_ct",
    @"cb",@"wi_dh_stat",
    @"cc",@"wi_user",
    nil];

I want to translate between c0 and synckey and back, and ditto for the other fields.

解决方案

The CHDataStructures framework has CHBidirectionalDictionary.

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