swift 未使用 UIDatePicker 更新 textfield.text

Question

在 swift 中，我有一个以编程方式声明的文本字段。

override func viewDidLoad() {
    super.viewDidLoad()
textField3.delegate = self

    textField3.returnKeyType = UIReturnKeyType.Next;
    datePicker.datePickerMode = UIDatePickerMode.Date
    datePicker.addTarget(self, action: Selector("handleDatePicker:"), forControlEvents: UIControlEvents.ValueChanged)
    textField3.inputView = datePicker


}

 func handleDatePicker(sender: UIDatePicker) {

    textField3.text = dateFormatter.stringFromDate(sender.date)
            }

我发现的所有其他问题都与界面生成器的处理类似，但没有帮助。我将如何以编程方式解决这个问题？

Answer 1

Xcode 9 • Swift 4

@objc func handleDatePicker(_ datePicker: UIDatePicker) {
    textField3.text = datePicker.date.formatted
}

override func viewDidLoad() {
    super.viewDidLoad()
    datePicker.addTarget(self, action: #selector(handleDatePicker), forControlEvents: .valueChanged)
}

extension Date {
    static let formatter: DateFormatter = {
        let formatter = DateFormatter()
        formatter.dateFormat = "EEEE, dd MMM yyyy HH:mm:ss Z"
        return formatter
    }()
    var formatted: String {
        return Date.formatter.string(from: self)
    }
}

Answer 2

Swift 3 版本的@Leo Dabus 回答：

func handleDatePicker(sender: UIDatePicker) {
        textField3.text = datePicker.date.formatted
    }

override func viewDidLoad() {
    super.viewDidLoad()
    datePicker.addTarget(self, action: #selector(handleDatePicker(sender:)), for: UIControlEvents.valueChanged)
}

extension Date {
    var formatted: String {
        let formatter = DateFormatter()
        formatter.dateFormat = "EEEE, dd MMM yyyy HH:mm:ss Z"
        return  formatter.string(from: self as Date)
    }
}

Answer 3

中，Swift4
确认 UITableViewDelegate
使 txtFChequeDate.delegate = 自我

func textFieldDidBeginEditing(_ textField: UITextField) {

    let datePickerView = UIDatePicker()
    datePickerView.datePickerMode = .date
    txtFChequeDate.inputView = datePickerView
    datePickerView.addTarget(self, action: #selector(handleDatePicker(sender:)), for: .valueChanged)

    if txtFChequeDate.text == "" {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "dd MMM yyyy"
        txtFChequeDate.text = dateFormatter.string(from: Date())
    }
}

@objc func handleDatePicker(sender: UIDatePicker) {
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "dd MMM yyyy"
    txtFChequeDate.text = dateFormatter.string(from: sender.date)
}

swift 未使用 UIDatePicker 更新 textfield.text

swift not updating textfield.text using UIDatePicker

ios

swift

uitextfield

uidatepicker