ios - 基于键对 NSMutableArray 进行排序，谓词不起作用？

Question

我有一个包含 150 多个对象的 NSMutableArray，我需要根据与输入名称匹配的键“名称”创建一个新数组。

所以我从 stackoverflow 得到了这个谓词代码

    NSMutableArray *listForm=[[NSMutableArray alloc]init]; //copy Original Array
    listForm=[arr valueForKey:@"data"]; //copied
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name == [c] %@", [selectedDrug valueForKey:@"name"]]; //checking name 

    NSLog(@"%@",[selectedDrug valueForKey:@"name"]); //my input name for matching

    [listForm filteredArrayUsingPredicate:predicate];  


    NSLog(@"%@",listForm);//final result

现在我得到了正确的结果，但同时我得到了额外的对象

比如 考虑这是我的大对象列表

[{
  name:"john",
  location:"washington",
  age:23
},{
  name:"Zirad kan",
  location:"iceland",
  age:23
},{
  name:"john",
  location:"usa",
  age:43
},{
  name:"riya",
  location:"india",
  age:20
},{
  name:"Rachel",
  location:"netherland",
  age:33
},{
  name:"john Mark",
  location:"washington",
  age:23
},{
  name:"john Doe",
  location:"washington",
  age:23
}]

从这里我需要所有名称与“john”完全匹配

所以结果会是这样

 [{
      name:"john",
      location:"washington",
      age:23
    },{
      name:"john",
      location:"usa",
      age:43
    }]

但是当我使用上面的代码时，我得到的是最终结果

 [{
      name:"john",
      location:"washington",
      age:23
    },{
      name:"john",
      location:"usa",
      age:43
    },{
      name:"john Mark",
      location:"washington",
      age:23
    },{
      name:"john Doe",
      location:"washington",
      age:23
    }]

如何删除“John Doe”和“John Mark”，就像我只需要匹配“john”的特定文本一样。

请帮帮我

Answer 1

[NSArray filteredArrayUsingPredicate:]返回过滤后的数组，因此:

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name == [c] %@",
    selectedDrug[@"name"]]; 
NSArray *filtered = [arr[@"data"] filteredArrayUsingPredicate:predicate];  

注意:这假设 arr 和 selectedDrug 都是 NSDictionary 实例。