如何将日期合并成字典？

哈纳菲·希亚姆（Hanafi Hisyam）

我在词典方面遇到麻烦。

例如，

我当前的数据

["date": "2018-01-01", "name": "New Year"], ["date": "2018-01-31", "name": "Public holiday"],["date": "2018-02-14", "name": "Valentine's Day"], ["date": "2018-02-28", "name": "Public Holiday"]

我该如何转化为

["month": ["January": ["date": "2018-01-01", "name": "New Year"], ["date": "2018-01-31", "name": "Public holiday"]],["February": ["date": "2018-02-14", "name": "Valentine's Day"], ["date": "2018-02-28", "name": "Public Holiday"]]]

瓦迪安

Dictionary有一种方法init(grouping:by:)可以很聪明地做到这一点。

然后将date参数转换为Date，然后将其转换为月份名称DateFormatter

let array = [["date": "2018-01-01", "name": "New Year"],
             ["date": "2018-01-31", "name": "Public holiday"],
             ["date": "2018-02-14", "name": "Valentine's Day"],
             ["date": "2018-02-28", "name": "Public Holiday"]]

let dictionary = Dictionary(grouping: array) { (item) -> String in
    let formatter = DateFormatter()
    formatter.dateFormat = "yyyy-MM-dd"
    guard let dateString = item["date"],
        let date = formatter.date(from: dateString) else  { return "Unknown" }
    formatter.dateFormat = "MMMM"
    return formatter.string(from: date)
}

print(["months" : dictionary])

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