iOS Swift 3 - UIDatePicker

Question

我有一個UIDatePicker顯示日期，月份和年份。但我不知道如何獲取這些參數。

那麼使用Swift 3從UIDatePicker獲得日，月和年的最佳方法是什麼？

Answer 1

在Swift 3中，您可以像這樣使用DateComponents。

對於.valueChanged事件，首先在datepicker上添加操作。

datepicker.addTarget(self, action: #selector(dateChanged(_:)), for: .valueChanged) 

然後得到的動作使用DateComponents選擇日，月，年。

func dateChanged(_ sender: UIDatePicker) { 
    let componenets = Calendar.current.dateComponents([.year, .month, .day], from: sender.date) 
    if let day = componenets.day, let month = componenets.month, let year = componenets.year { 
     print("\(day) \(month) \(year)") 
    } 
} 

Answer 2

創建IBOutlet的UIDatePicker並正確連接，然後使用下面的代碼來獲取日，月，年等。

var comp = NSDateComponents() 
@IBOutlet weak var datePicker: UIDatePicker! 

override func viewDidLoad() { 
    super.viewDidLoad() 
    datePicker.addTarget(self, action: Selector("datePickerChanged:"), forControlEvents: UIControlEvents.ValueChanged) 
} 

func datePickerChanged(datePicker:UIDatePicker){ 
    let dateFormatter = NSDateFormatter() 
    dateFormatter.dateStyle = NSDateFormatterStyle.ShortStyle 
    dateFormatter.timeStyle = NSDateFormatterStyle.ShortStyle 
    let cal = NSCalendar.currentCalendar() 
    comp = cal.components([.Era, .Day, .Month, .Year, .Hour, .Minute] , fromDate: datePicker.date) 

    // getting day, month, year ect 
    print ("Era:\(comp.era) Date:\(comp.day) Month:\(comp.month) Month:\(comp.year) Hours: \(comp.hour) Minuts:\(comp.minute)") 
} 

Answer 3

，如果你想顯示在文本框敲擊，當用戶選擇它的一些日期，那麼它會在你的文本框自動填充日期選擇器假設。

@IBOutlet weak var dateTextField: UITextField! 
let datePickerView:UIDatePicker = UIDatePicker() 
     datePickerView.datePickerMode = UIDatePickerMode.date 
     dateTextField.inputView = datePickerView 
     datePickerView.addTarget(self, action: #selector(ViewController.datePickerValueChanged), for: UIControlEvents.valueChanged) 

// Make a dateFormatter in which format you would like to display the selected date in the textfield. 
func datePickerValueChanged(sender:UIDatePicker) { 

     let dateFormatter = DateFormatter() 

     dateFormatter.dateStyle = DateFormatter.Style.medium 

     dateFormatter.timeStyle = DateFormatter.Style.none 

     dateTextField.text = dateFormatter.string(from: sender.date) 

    } 

這裏的Sender.date是UIDatePicker的實例從datepicker中選取日期並填充到文本字段上。

Answer 4

該問題可以通過多種方式解決。如果你正在尋找一個解決方案只使用代碼：

class Foo: UIViewController { 
     // Lets create your picker - Can be IBOutlet too 
     lazy var datePicker: UIDatePicker = { 
      let picker = UIDatePicker() 
      picker.datePickerMode = .date 
      return picker 
     }() 

    override func viewDidLoad() { 
     super.viewDidLoad() 
     //Observe the value changes in datePickerValueChanged function for example 
     datePicker.addTarget(self, action: #selector(datePickerValueChanged), for: .valueChanged) 
    } 

    func datePickerValueChanged(sender: UIDatePicker) { 
     // Function will be called every time picker changes it's value 
     // You can access to it the following way 
     print(sender.date) 
    } 
    } 

的另一種方式，如果你有在Interface Builder您UIDatePicker。你幾乎需要同樣的東西，就像上面一樣，但我的方式稍有不同。在Interface Builder中點擊你UIDatePicker：

你看在BUTTOM的Value Changed選項。現在你抓住並拖動IBAction您的viewController，並設置您的連接是這樣的：

這樣你achive一樣的第一個例子，因爲你最終得到幾乎相同的功能：

@IBAction func datePickerValueChanged(sender: UIDatePicker) { 
    print(sender.date) 
} 

Answer 5

var picker = UIDatePicker() 
picker = UIDatePicker() 
textField.inputView = picker 
picker.addTarget(self, action: #selector(ViewController.handleDatePicker), for: UIControlEvents.valueChanged) 
picker.datePickerMode = .date 

func handleDatePicker() { 
    var dateFormatter = DateFormatter() 
    dateFormatter.dateFormat = "dd-MM-yyyy" 
    textfield.text = dateFormatter.string(from: picker.date) 
    textfield.resignFirstResponder() 
} 

Answer 6

的UIDatePicker在夫特3和4斯威夫特例子。

在斯威夫特3可以使用

1. 創建快捷3
2. 將單查看應用程序的簡單項目的文本字段&連接的viewController
3. 日期選擇器看起來就像圖像

1. ViewController代碼如下。。

   class ViewController: UIViewController { 
       //Text Field Connection 
       @IBOutlet weak var txtDatePicker: UITextField! 
       //Uidate picker 
       let datePicker = UIDatePicker() 
   
       override func viewDidLoad() { 
       super.viewDidLoad() 
       //show date picker 
       showDatePicker() 
       } 
   
   
       func showDatePicker(){ 
       //Formate Date 
       datePicker.datePickerMode = .date 
   
       //ToolBar 
       let toolbar = UIToolbar(); 
       toolbar.sizeToFit() 
   
       //done button & cancel button 
       let doneButton = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.bordered, target: self, action: "donedatePicker") 
       let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace, target: nil, action: nil) 
       let cancelButton = UIBarButtonItem(title: "Cancel", style: UIBarButtonItemStyle.bordered, target: self, action: "cancelDatePicker") 
       toolbar.setItems([doneButton,spaceButton,cancelButton], animated: false) 
   
   // add toolbar to textField 
   txtDatePicker.inputAccessoryView = toolbar 
   // add datepicker to textField 
   txtDatePicker.inputView = datePicker 
   
       } 
   
   func donedatePicker(){ 
       //For date formate 
       let formatter = DateFormatter() 
       formatter.dateFormat = "dd/MM/yyyy" 
       txtDatePicker.text = formatter.string(from: datePicker.date) 
       //dismiss date picker dialog 
       self.view.endEditing(true) 
       } 
   
        func cancelDatePicker(){ 
        //cancel button dismiss datepicker dialog 
        self.view.endEditing(true) 
        } 
       } 
   

2. 完整源代碼項目授予github。 GitHub的鏈接：https://github.com/enamul95/DatePicker1

   在斯威夫特4您可以使用波紋管代碼

   class ViewController: UIViewController { 
   
       @IBOutlet weak var txtDatePicker: UITextField! 
       let datePicker = UIDatePicker() 
   
       override func viewDidLoad() { 
       super.viewDidLoad() 
       showDatePicker() 
       } 
   
   
       func showDatePicker(){ 
       //Formate Date 
       datePicker.datePickerMode = .date 
   
       //ToolBar 
       let toolbar = UIToolbar(); 
       toolbar.sizeToFit() 
       let doneButton = UIBarButtonItem(title: "Done", style: .plain, target: self, action: #selector(donedatePicker)); 
       let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace, target: nil, action: nil) 
       let cancelButton = UIBarButtonItem(title: "Cancel", style: .plain, target: self, action: #selector(cancelDatePicker)); 
   
   toolbar.setItems([doneButton,spaceButton,cancelButton], animated: false) 
   
       txtDatePicker.inputAccessoryView = toolbar 
       txtDatePicker.inputView = datePicker 
   
   } 
   
       @objc func donedatePicker(){ 
   
       let formatter = DateFormatter() 
       formatter.dateFormat = "dd/MM/yyyy" 
       txtDatePicker.text = formatter.string(from: datePicker.date) 
       self.view.endEditing(true) 
   } 
   
   @objc func cancelDatePicker(){ 
       self.view.endEditing(true) 
       } 
   }