如何快速按日期对对象数组进行分组? [英] How to group array of objects by date in swift?

问题描述

需要根据日期分组.响应以排序格式显示.需要在日期上应用过滤器以进行分组. 来自后端的响应:

Need to group according to date. Response coming is in sorted format. Need to apply a filter on date to group. Response coming from backend:

[
    {
    "date": "date1"
    }, 
    {
    "date": "date1"
    },
    {
    "date": "date1"
    },
    {
    "date": "date2"
    },
    {
    "date": "date2"
    },
    {
    "date": "date3"
    }
]

必填:

[
    [
        "date": "2017-05-30T12:40:39.000Z",
        "message": [
            {
                "date_time": 2017-05-30T12: 40: 39.000Z
            }
        ]
    ],
    [
        "date": "2017-05-31T05:43:17.000Z",
        "message": [
            {
                "date_time": 2017-05-31T05: 43: 17.000Z
            },
            {
                "date_time": 2017-05-31T05: 44: 15.000Z
            },
            {
                "date_time": 2017-05-31T05: 44: 38.000Z
            }
        ]
    ]
]

我检查了多个答案，但找不到一个好的解决方案.

I have checked multiple answers but wasn't able to find a good solution.

推荐答案

这是我按日期(仅日，月和年)分组的解决方案:

This is my solution to group by date(just day, month and year):

let groupDic = Dictionary(grouping: arr) { (pendingCamera) -> DateComponents in

    let date = Calendar.current.dateComponents([.day, .year, .month], from: (pendingCamera.date)!)

    return date
}

这篇关于如何快速按日期对对象数组进行分组?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！