swift - 如何将日期 "MM-dd-yyyy hh:mm:ss a"转换成文本格式？

Question

我正在尝试创建一个将日期转换为文本格式的函数，例如“刚刚，2 分钟，1 小时，1 天，10 月 10 日”。这是我在以下位置遇到错误的示例代码:

let components = cal.components([.Day,.Hour,.Minute], fromDate: date, toDate: NSDate(), options:[])

这是我的完整代码:

func getTextToDisplayFormattingDate(date: NSDate) -> String {
    var textToDisplay = ""
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "MM-dd-yyyy hh:mm:ss a"
    dateFormatter.timeZone = TimeZone(identifier: "UTC")

    let cal = NSCalendar.current

    let components = cal.components([.Day,.Hour,.Minute], fromDate: date, toDate: NSDate(), options:[])

    switch components.day {
    case 0:
        if components.hour == 0 {
            if components.minute <= 0 {
                textToDisplay = "just now "
            } else {
                textToDisplay = "\(components.minute) min"
            }
        } else {
            textToDisplay = "\(components.hours) hrs"
        }
    case 1...6:
        textToDisplay = "\(components.day) d"
    default:
        dateFormatter.dateFormat = "MMM dd"
        textToDisplay = dateFormatter.string(from: date as Date)
    }

    return textToDisplay
}

Answer 1

像这样使用:

我的代码中的更改:

1. 代替 NSDate，我使用了 Date。
2. 代替 NSCalendar 我使用 Calendar
3. components(_:from:to:options:) 已重命名为 dateComponents(_:from:to:)

4. components 值，例如 day, minute, hour 是 optional。这就是我在切换前添加检查的原因。

   func getTextToDisplayFormattingDate(date: Date) -> String {
       var textToDisplay = ""
       let dateFormatter = DateFormatter()
       dateFormatter.dateFormat = "MM-dd-yyyy hh:mm:ss a"
       dateFormatter.timeZone = TimeZone(identifier: "UTC")
   
       let cal = Calendar.current
       let components = cal.dateComponents([.day, .hour , .minute], from: date, to: Date())
   
       if let day = components.day, let minute = components.minute, let hour = components.hour {
           switch day {
           case 0:
               if hour == 0 {
                   if minute <= 0 {
                       textToDisplay = "just now "
                   } else {
                       textToDisplay = "\(minute) min"
                   }
               } else {
                   textToDisplay = "\(hour) hrs"
               }
           case 1...6:
               textToDisplay = "\(day) d"
           default:
               dateFormatter.dateFormat = "MMM dd"
               textToDisplay = dateFormatter.string(from: date)
           }
       }
       return textToDisplay
   }