问题
I have a code similar to this:
let datePicker = NSDatePicker(....)
self.addSubview(datePicker)
self.window?.makeFirstResponder(datePicker)
When makeFirstResponder
is called first element gets editing focus. For U.S region this picks day of the month, because date format is DD-MM-YYYY. For other regions when date format is YYYY-MM-DD, YYYY gets editing focus. How can I force NSDatePicker
to start editing day of the month no matter what date format is?
回答1:
You can use DateFormatter method func dateFormat(fromTemplate tmplate: String, options opts: Int, locale: Locale?) -> String?
to check the current locale dateFormat, check the location of the day and send the tab key 0, 1 or 2 times:
import Cocoa
class ViewController: NSViewController {
@IBOutlet weak var datePicker: NSDatePicker!
override func viewWillAppear() {
super.viewWillAppear()
datePicker.locale = .init(identifier: "en_US")
datePicker.dateValue = Date()
if view.window?.makeFirstResponder(datePicker) == true {
selectDayElement(from: datePicker)
}
}
func selectDayElement(from datePicker: NSDatePicker) {
if let firstIndex = DateFormatter
.dateFormat(fromTemplate: "yyyyMMdd",
options: 0,
locale: datePicker.locale)?
.components(separatedBy: .punctuationCharacters)
.firstIndex(of: "dd") {
(0..<firstIndex).forEach { _ in
datePicker.keyDown(with: NSEvent(cgEvent: CGEvent(keyboardEventSource: nil, virtualKey: 48, keyDown: true)!)!)
}
}
}
}
来源:https://stackoverflow.com/questions/61721346/nsdatepicker-focus-on-day-of-the-month-editing