全部。我有一个 NSMutableArray ,它的名字是 dummyPerson。它的元素是 NSMutableDictionary。像下面这样的代码。我想排除重复的屏幕名称。
```
self.dummyPeople = [{screenName: "apple",tweet: "hi"},{screenName:"orange",tweet:"foo"},{screenName:"apple",tweet: "hoge"}];
// filteredByScreenName is procedure code.
[self.dummyPeople filteredByScreenName]
#=> return [{screenName:"apple",tweet:"hi"},{screenName:"orange",tweet:"foo"}];
```
你有什么主意吗?提前致谢。