ios 一维数组变二维数组

项目中需要根据type的值来分数组

     NSArray *ary = [NSArray yy_modelArrayWithClass:ActionModel.class json:data];
    //得到数组中的type并去掉重复的
    NSMutableDictionary *typesDic = NSMutableDictionary.new;
    for (int i=0; i<ary.count; i++) {
        ActionModel *model = ary[i];
        [typesDic setObject:@(model.type) forKey:@(model.type)];
    }
    // 对数组进行排序
       NSArray *result = [typesDic.allValues sortedArrayUsingComparator:^NSComparisonResult(id _Nonnull obj1, id _Nonnull obj2) {
//           NSLog(@"%@~%@",obj1,obj2); // 3~4 2~1 3~1 3~2
           return [obj1 compare:obj2]; // 升序
//           return [obj2 compare:obj1]; // 降序
       }];
    //根据数组中的type分数组
    NSMutableArray *redDataAry = NSMutableArray.new;
    for (int i=0; i<typesDic.allValues.count; i++) {
        NSNumber *type = typesDic.allValues[i];
        NSMutableArray *typeAry = NSMutableArray.new;
        for (ActionModel *model in ary ) {
            if (model.type == type.intValue) {
                [typeAry addObject:model];
            }
        }
        [redDataAry addObject:typeAry];
    }
``