过滤数组元素中拥有相同属性的元素

 //洗数据，过滤重复
    NSMutableArray* arr1 = [NSMutableArray array];
//若arr2直接赋值 _dataSearch，因为属指针赋值，removeObject后就会出错
    NSMutableArray* arr2 = [NSMutableArray arrayWithArray:_dataSearch];
    for (KLFeedNoteSqlModel*model1 in _dataSearch) {
        [arr2 removeObject:model1];
        for (KLFeedNoteSqlModel*model2 in arr2) {

            if ([model1.store_id isEqualToString:model2.store_id] && ![model1 isEqual:model2]) {
                [arr1 addObject:model2];
            }
        }
    }
    for (KLFeedNoteSqlModel*model3 in arr1) {
        [_dataSearch removeObject:model3];
    }