[英]Swift - Adding a pickerView to a textfield in UIViewController
我在使用可選選項方面有些掙扎,並通過使用@IBOutlet設置視圖和子視圖。 我目前正在嘗試創建一個控制器,以將用戶添加到數據庫中。 我的字段之一與用戶的性別有關,因此我希望將其鏈接到UIPickerView。 我沒有使用Storyboard。
我從代碼中刪除了所有其他字段,以使其變得更短且更易讀,但它還將具有其他UIPickerView字段(例如生日)。
有人可以幫助我處理我的代碼,以便在選中時我的文本字段顯示UIPickerView嗎?
class AddUserController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource, UITextFieldDelegate {
var picker: UIPickerView = UIPickerView()
var genderData = ["Male", "Female"]
// Containers
let inputsContainerView: UIView = {
let view = UIView()
view.backgroundColor = UIColor.whiteColor()
view.translatesAutoresizingMaskIntoConstraints = false
view.layer.masksToBounds = true
return view
}()
// Subviews
@IBOutlet weak var genderTextField: UITextField! = {
var gender = UITextField()
gender.placeholder = "Gender"
gender.translatesAutoresizingMaskIntoConstraints = false
gender.leftViewMode = UITextFieldViewMode.Always
gender.autocorrectionType = .No
let lbl = UILabel(frame: CGRect(x: 0, y: 0, width: 120, height: 30))
lbl.text = "GENDER"
lbl.font = UIFont.boldSystemFontOfSize(12)
gender.leftView = lbl
return gender
}()
override func viewDidLoad() {
super.viewDidLoad()
picker = UIPickerView()
picker.dataSource = self
picker.delegate = self
picker.hidden = true
genderTextField?.delegate = self
genderTextField?.inputView = picker
genderTextField?.text = genderData[0]
view.backgroundColor = UIColor(white: 0.95, alpha: 1)
view.addSubview(inputsContainerView)
setupInputsContainerView()
}
// Picker functions
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return genderData.count
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return genderData[row]
}
func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)
{
genderTextField.text = genderData[row]
self.view.endEditing(true)
picker.hidden = true
}
func textFieldShouldBeginEditing(textField: UITextField) -> Bool {
picker.hidden = false
return true
}
// Setup all the views
func setupInputsContainerView() {
inputsContainerView.centerXAnchor.constraintEqualToAnchor(view.centerXAnchor).active = true
inputsContainerView.topAnchor.constraintEqualToAnchor(view.bottomAnchor, constant: 12).active = true
inputsContainerView.widthAnchor.constraintEqualToAnchor(view.widthAnchor, constant: -24).active = true
inputsContainerView.heightAnchor.constraintEqualToConstant(40).active = true
inputsContainerView.addSubview(genderTextField)
genderTextField.leftAnchor.constraintEqualToAnchor(inputsContainerView.leftAnchor, constant: 12).active = true
genderTextField.topAnchor.constraintEqualToAnchor(inputsContainerView.topAnchor).active = true
genderTextField.widthAnchor.constraintEqualToAnchor(inputsContainerView.widthAnchor).active = true
genderTextField.heightAnchor.constraintEqualToAnchor(inputsContainerView.heightAnchor).active = true
}
}
每次調用該方法時,就會創建一個characterTextField。
genderTextField?.delegate = self
genderTextField?.inputView = picker
genderTextField?.text = genderData[0]
所有這些都是不同的對象
inputsContainerView.addSubview(genderTextField)
您在此處添加的內容也有所不同。 因此,您添加到視圖的textField和添加的委托/數據源都是不同的。 一種快速的解決方案是移動
genderTextField?.delegate = self
genderTextField?.inputView = picker
genderTextField?.text = genderData[0]
這些代碼在此行之后inputsContainerView.addSubview(genderTextField)
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