迅速に予定を作成するのに適したカスタムUIDatePickerを作成する

class ViewController: UIViewController , UIPickerViewDelegate, 
UIPickerViewDataSource
{
var pickerView: UIPickerView!
@IBOutlet weak var textField: UITextField!
var arrDate = [String]()
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.

    arrDate.append(Date().getDateStringWithFormate("yyyy-MM-dd", timezone: TimeZone.current.abbreviation()!))
    for i in 1...7
    {
        let dateAdded = Date().addDays(i)
        arrDate.append(dateAdded.getDateStringWithFormate("yyyy-MM-dd", timezone: TimeZone.current.abbreviation()!))
        print(arrDate)
    }

    pickerView = UIPickerView()
    pickerView.delegate = self
    pickerView.dataSource = self

    let keyboardToolbar = UIToolbar(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.size.width, height: 44))
    keyboardToolbar.barStyle = .black
    keyboardToolbar.tintColor = UIColor.white
    let barButtonItem = UIBarButtonItem(title: NSLocalizedString("Done", comment: ""), style: .done, target: self, action: #selector(clickToKeyboardToolbarDone(sender:)))
    //(barButtonSystemItem: .done, target: self, action: #selector(clickToKeyboardToolbarDone(sender:)))

    let flex = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: self, action: nil)
    let items = [flex, barButtonItem]
    keyboardToolbar.setItems(items, animated: true)
    textField.inputAccessoryView = keyboardToolbar
    textField.inputView = pickerView
}
@IBAction func clickToKeyboardToolbarDone(sender: UIBarButtonItem)
{
    if(textField.isFirstResponder)
    {
        let selectedIndex = pickerView.selectedRow(inComponent: 0)
        let currentDate = arrDate[selectedIndex]
        print("currentDate",currentDate)
    }
    textField.resignFirstResponder()
}
//MARK: - UIPickerViewDelegate, UIPickerViewDataSource Methods
func numberOfComponents(in pickerView: UIPickerView) -> Int
{
    return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int
{
    return arrDate.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String?
{
    return arrDate[row]
}
override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    // Get the new view controller using segue.destinationViewController.
    // Pass the selected object to the new view controller.
}
*/
}

//MARK: - All Date Extension
extension Date
{
   func getDateStringWithFormate(_ formate: String, timezone: String) -> String
    {
        let formatter = DateFormatter()
    formatter.dateFormat = formate
    formatter.timeZone = TimeZone(abbreviation: timezone)
    return formatter.string(from: self)
    }
}

customepickerビューを使用して、今日までの日付の配列を最大7日間作成し、このコードを試してください。