ios - 如何获取 NSMutablearray 中特定对象的索引？

Question

我有这样的 NSMutablearray(它是一个 JSON 数组)

{
   "notification_list":[
      {
         "TYPE":"ARTIST",
         "ID":"07",
         "DTEXT":"Now you can listen to the songs of ARTIST1",
         "ADDEDDATE":"27th June, 2013 4:44 pm."
      },
      {
         "TYPE":"BRAND",
         "ID":"http:\/\/www.me.lk\/",
         "DTEXT":"M Entertainment have been joined with Mobile Music",
         "ADDEDDATE":"27th June, 2013 3:37 pm."
      },
      {
         "TYPE":"ARTIST",
         "ID":"03",
         "DTEXT":"Now you can listen to the songs of ARTIST2",
         "ADDEDDATE":"27th June, 2013 3:37 pm."
      },
      {
         "TYPE":"ALBUM",
         "ID":"Nava Ridgma",
         "DTEXT":"Get new album of ARTIST3, Nava ridma",
         "ADDEDDATE":"27th June, 2013 3:37 pm."
      },
      {
         "TYPE":"SONG",
         "ID":"05",
         "DTEXT":"New Song added to the Mobile Music - Hanthane Kandumuduna by ARTIST5, Album - Aradhana",
         "ADDEDDATE":"27th June, 2013 3:37 pm."
      }
   ]
}

现在我想在这个 NSMutablearray

中获取这个特定对象的索引

{
   "TYPE":"ALBUM",
   "ID":"Nava Ridgma",
   "DTEXT":"Get new album of ARTIST3, Nava ridma",
   "ADDEDDATE":"27th June, 2013 3:37 pm."
}

我如何从这个 NSMutablearray 搜索这个对象并获取索引。

谁能帮帮我。

谢谢

Answer 1

尝试

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"TYPE == [cd] %@",@"ALBUM"];

NSInteger index = [array indexOfObjectPassingTest:^BOOL(id obj, NSUInteger idx, BOOL *stop) {
    return [predicate evaluateWithObject:obj];
}];

NSLog(@"Index of object %d",index);