如果分钟 < 9 在它之前添加一个 0

Question

使用此代码，您可以保存当前时间，但如果 Minutes < 9 比它给您 5:9 而不是 5:09 的时间。你怎么能解决这个问题？

let date = Date()
let calendar = Calendar.current
let hour = calendar.component(.hour, from: date)
let minutes = calendar.component(.minute, from: date)
let Tijd = "\(hour) : \(minutes)"

Answer 1

你有两个选择。

1. 用一个 String(format:)

   let date = Date()
   let calendar = Calendar.current
   let hour = calendar.component(.hour, from: date)
   let minutes = calendar.component(.minute, from: date)
   let tijd = String(format:"%d:%02d", hour, minutes) // change to "%02d:%02d" if you also want the hour to be 2-digits.
   

2. 使用DateFormatter.

   let date = Date()
   let df = DateFormatter()
   df.dateFormat = "H:mm" // Use "HH:mm" if you also what the hour to be 2-digits
   let tijd = df.string(from: date)