獲取從日期選取器串日期變量

Question

我已經制作和順序應用程序我有采取outlet命名爲：selectedDate，我想檢索選定日期的變量。我應該在View中放置什麼。

@IBOutlet weak var selectedDate: UIDatePicker! 

func datePickerChanged(selectedDate:UIDatePicker) { 
    var dateFormatter = DateFormatter() 
    dateFormatter.dateStyle = DateFormatter.Style.FullStyle 
    dateFormatter.timeStyle = DateFormatter.Style.FulltStyle 
    var strDate = dateFormatter.string(from: selectedDate.date) 
} 

Answer 1

class ViewController: UIViewController { 

@IBOutlet weak var datePicker: UIDatePicker! 

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

override func didReceiveMemoryWarning() { 
    super.didReceiveMemoryWarning() 
    // Dispose of any resources that can be recreated. 
} 
@IBAction func datePickerChanged(sender: UIDatePicker) { 

    print("print \(sender.date)") 

    let dateFormatter = NSDateFormatter() 
    dateFormatter.dateFormat = "MMM dd, YYYY" 
    let somedateString = dateFormatter.stringFromDate(sender.date) 

    print(somedateString) // "somedateString" is your string date 
} 


} 

你必須創建一個IBAction爲的日期選擇器，並將其命名爲「datePickerChanged」，就像你創建對象的出口。將對象拖動到Viewcontroller時選擇連接類型「操作」。

Answer 2

func datePickerChanged(_:UIDatePicker)是目標函數。

你有沒有正確設定的目標？

// Precise that our controller implement the delegate 
class MyViewController: UIViewController { 
    ... 
    @IBOutlet weak var selectedDate: UIDatePicker! 
    ... 
    override func viewDidLoad() { 
    super.viewDidLoad() 
    ... 
    selectedDate.addTarget(self, action: #selector(datePickerChanged(_:)), forControlEvents: .valueChanged) // We register the target function 
    } 

    ... 
    // We implement that function 
    func datePickerChanged(sender:UIDatePicker) { 
    let dateFormatter = DateFormatter() 
    dateFormatter.dateStyle = .full 
    dateFormatter.timeStyle = .full 
    let strDate = dateFormatter.string(from: sender.date) 
    print(strDate) 
    } 
}