DatePicker 和 Data 的運用
(三生三生十里桃花 白淺等待夜華的歸來
附上程式碼：
import UIKit
var timer: Timer?
class ViewController: UIViewController {
@IBOutlet weak var nowTimeLabel: UILabel!
@IBOutlet weak var setTimeLabel: UILabel!
@IBOutlet weak var intervalTimeLabel: UILabel!
@IBOutlet weak var changeDatePicker: UIDatePicker!
var setTime = Date()
//取得現在的時間
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
changeDatePicker.minimumDate = Date()
//datepicker的日期只能從今天開始選擇，不能選今天以前的時間
changeDatePicker.datePickerMode = .dateAndTime
changeDatePicker.locale = Locale(identifier: “zh_CN”)
//datepicker的年月日顯示中文
nowTimeLabel.text = “目前是”+timeFormatter(setTime)
if let timer = timer {
timer.invalidate()
}
//計時器，withTimeInterval間隔時間，repeats重複
timer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true, block: { (_) in
let interval = Int(self.changeDatePicker.date.timeIntervalSinceNow)
let second = interval % 60
let minute = interval / 60 % 60
let hour = interval / 3600 % 24
let day = interval / (3600*24)
self.intervalTimeLabel.text = “\(day)天\(hour)小時\(minute)分\(second)秒”
})
}
func timeFormatter(_ time: Date)->String{
//利用 DateFormatter 將 time 變成 String，然後再用 DateFormatter 的 dateFormat 設定字串的格式。
let formatter = DateFormatter()
formatter.dateFormat = “yyyy年MM月dd日 HH:mm:ss”
return formatter.string(from: time)
}
@IBAction func changeDatePicker(_ sender: UIDatePicker) {
setTimeLabel.text = “夜華回來的日子是”+timeFormatter(changeDatePicker.date)
}
}
