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[英]How to compare between two dates and make timer countdown between them in swift 4
[英]Timer coutdown between two dates in swift
我想在兩個日期之間集成計時器,一個是選擇日期,另一個是按鈕標題上的當前日期,就像任何其他倒計時應用程序一樣。
func countDownDate() {
var calendar = Calendar.current
let diffDateComponents = calendar.dateComponents([.day, .hour, .minute, .second], from: self.startDate, to: self.currentDate as Date)
let countdown = "Days \(String(describing:diffDateComponents.day!)), Hours: \(String(describing: diffDateComponents.hour!)), Minutes: \(String(describing: diffDateComponents.minute!)), Seconds: \(String(describing: diffDateComponents.second!))"
print("countdown",countdown)
var dayText = String(describing: diffDateComponents.day!) + "d "
var hourText = String(describing: diffDateComponents.hour!) + "h "
self.button_CreateBid.setTitle(dayText + hourText + String(describing: diffDateComponents.minute!) + "m " + String(describing: diffDateComponents.second!) + "s", for: .normal)
}
let when = DispatchTime.now() + 0.1 // change 2 to desired number of seconds
DispatchQueue.main.asyncAfter(deadline: when) {
Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(ServiceDetailViewController.countDownDate), userInfo: nil, repeats: true)
}
我已經檢查了您的代碼及其在我的系統上的運行情況。您只需稍作改動就可以運行它。 下面是我的代碼。
@IBOutlet weak var btnTimeLabel : UIButton!
將此代碼放在viewDidLoad
let when = DispatchTime.now() + 0.1 // change 2 to desired number of seconds
DispatchQueue.main.asyncAfter(deadline: when) {
Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(ViewController.countDownDate), userInfo: nil, repeats: true)
}
我已經在你的函數中設置了下一個日期和當前日期。
@objc func countDownDate() {
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd-mm-yyyy" //Your date format
dateFormatter.timeZone = TimeZone(abbreviation: "GMT+0:00") //Current time zone
let futuredate = dateFormatter.date(from: "22-02-2018") //according to date format your date string
var calendar = Calendar.current
let diffDateComponents = calendar.dateComponents([.day, .hour, .minute, .second], from: futuredate!, to: Date())
let countdown = "Days \(String(describing:diffDateComponents.day!)), Hours: \(String(describing: diffDateComponents.hour!)), Minutes: \(String(describing: diffDateComponents.minute!)), Seconds: \(String(describing: diffDateComponents.second!))"
print("countdown",countdown)
var dayText = String(describing: diffDateComponents.day!) + "d "
var hourText = String(describing: diffDateComponents.hour!) + "h "
btnTimeLabel.setTitle(dayText + hourText + String(describing: diffDateComponents.minute!) + "m " + String(describing: diffDateComponents.second!) + "s", for: .normal)
//print(dayText + hourText + String(describing: diffDateComponents.minute!) + "m " + String(describing: diffDateComponents.second!) + "s")
}
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