swift - 显示 24 小时时间，带 0

Question

我正在尝试修复我的时间显示。我目前将其显示为 24 小时，但不显示 0所以它会显示1:5而不是01:05

override func motionEnded(_ motion: UIEvent.EventSubtype, with event: UIEvent?) {

    let dateTime = Date()
    let cal = Calendar.current
    let dfm = DateFormatter()
    dfm.dateFormat = "MMM"


    let time = String(cal.component(.hour, from: dateTime)) + ":" + String(cal.component(.minute, from: dateTime))

    let month = dfm.string(from: dateTime)

    let date = String(cal.component(.day, from: dateTime))  + " " + month

    timeNow.text = time
    dateNow.text = date .uppercased()

    self.dateTimeView.alpha = 1

    DispatchQueue.main.asyncAfter(deadline: .now() + 3) {


        UIView .transition(with: self.dateTimeView, duration: 0.5, options: UIView.AnimationOptions.curveEaseIn, animations: {self.dateTimeView.alpha = 0}, completion: nil)

    }

如何格式化时间以显示前导 0的？

Answer 1

您似乎了解 DateFormatter，但仅使用它来格式化月份。您也可以使用它来格式化其他内容，例如天、小时和分钟。

let dateTime = Date()
let cal = Calendar.current
let dfm = DateFormatter()
dfm.dateFormat = "dd MMM" // this is the format of the date string you need

let date = dfm.string(from: dateTime).uppercased()

dfm.dateFormat = "HH:mm" // this is the format of the time string you need

let time = dfm.string(from: dateTime)

timeNow.text = time
dateNow.text = date