倒数日期代码问题无法正确倒数

Question

能否请您解决此代码？无论我选择哪个日期，都表明只剩1天了。

我尝试了许多其他代码来倒计时，但没有任何效果。

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var countLabel: UILabel!

    var datePicker = UIDatePicker()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        //Set up the date picker to pick dates, not dates & times
        datePicker.datePickerMode =  .date

        //Force the date picker to use midnight today as it's base date and
        //to pick a date at least 1 day in the future

        guard let today = Calendar.current.date(bySettingHour: 0, minute: 0, second: 0, of: Date()),
            let tomorrow = Calendar.current.date(byAdding: .day, value: 1, to: today)
            else {
                return
        }
        datePicker.minimumDate = tomorrow
        datePicker.date = tomorrow

    }

    @IBAction func datePickerChanged(_ sender: UIDatePicker) {
        let future = datePicker.date
        //Use midnight today as the starting date
        guard let today = Calendar.current.date(bySettingHour: 0, minute: 0, second: 0, of: Date()) else { return }

        //Calculate the number of days between today and the =user's chosen day.
        let difference = Calendar.current.dateComponents([.day], from: today, to: future)
        guard let days = difference.day else { return }
        let ess = days > 1 ? "s" : ""
        countLabel.text = "That date is \(days) day\(ess) away."

    }

}

Answer 1

您应该从作为参数发送给函数的datepicker中获取日期

let future = sender.date

并且您可能还需要修复日期选择器的初始化