Question

我正在尝试创建一个文本框，当它被选中时，UIPickerView会打开，并提供可供选择的选项。选择后，UIPickerView将隐藏，所选项目将显示在文本框中。我尝试了在网上找到的不同代码，但我无法让它工作。如果有人可以为我建议一个完整的代码，或者告诉我在我的代码中我做错了什么，这将是非常棒的。非常感谢。

这是我的代码：

@IBOutlet var textfieldBizCat: UITextField!
@IBOutlet var pickerBizCat: UIPickerView! = UIPickerView()

var bizCat = ["Cat One", "Cat Two", "Cat Three"]


override func viewDidLoad() {
    super.viewDidLoad()

    var bizCatCount = bizCat.count

    self.textfieldBizCat.inputView = pickerView

}

// returns the number of 'columns' to display.
func numberOfComponentsInPickerView(pickerView: UIPickerView!) -> Int{
    return 1
}

// returns the # of rows in each component..
func pickerView(pickerView: UIPickerView!, numberOfRowsInComponent component: Int) -> Int{
    return bizCat.count
}

func pickerView(pickerView: UIPickerView!, titleForRow row: Int, forComponent component: Int) -> String! {
    return bizCat[row]
}

func pickerView(pickerView: UIPickerView!, didSelectRow row: Int, inComponent component: Int)
{
    textfieldBizCat.text = "\(bizCat[row])"

}

Answer 1

如果我理解你的问题，你想要：

有UITextField显示选中的文字
当用户点击UITextField
选择项目（在选择器中）时关闭选取器，并将其设置在`UITextField

这是管理它的完整代码，您只需要链接UITextField的代表：

@IBOutlet var textfieldBizCat: UITextField!
@IBOutlet var pickerBizCat: UIPickerView! = UIPickerView()

var bizCat = ["Cat One", "Cat Two", "Cat Three"]


override func viewDidLoad() {
    super.viewDidLoad()
    pickerBizCat.hidden = true;
    textfieldBizCat.text = bizCat[0]
}

// returns the number of 'columns' to display.
func numberOfComponentsInPickerView(pickerView: UIPickerView!) -> Int{
    return 1
}

// returns the # of rows in each component..
func pickerView(pickerView: UIPickerView!, numberOfRowsInComponent component: Int) -> Int{
    return bizCat.count
}

func pickerView(pickerView: UIPickerView!, titleForRow row: Int, forComponent component: Int) -> String! {
    return bizCat[row]
}

func pickerView(pickerView: UIPickerView!, didSelectRow row: Int, inComponent component: Int)
{
    textfieldBizCat.text = bizCat[row]
    pickerBizCat.hidden = true;
}

func textFieldShouldBeginEditing(textField: UITextField) -> Bool {
    pickerBizCat.hidden = false
    return false
}

我从您的代码中更改了内容：

使用UITextFieldDelegate在选择UITextField时显示选择器
选择项目后隐藏选择器，然后设置UITextField
选择任何项目时，在UITextField中设置选择器的第一行

Answer 2

  // pressing the button again would hide the uipickerview. when pressed the first time, update the button's label to "done" , "hide" or whatever suits u!
    @IBAction func propertyTypeButtonPressed(sender: UIButton)/* the name of your button's action*/
    {
        count++; //declare it first
        ViewContainigPickerView.hidden = false
        self.view.endEditing(true)

        if (count == 2)
        {
            ViewContainingPickerView.hidden = true /* if you placed your picker on a separate view for simplicity*/
            count = 0;

        }

    }

Answer 3

你的didSelectRow方法怎么样你resignFirstResponder？

func pickerView(pickerView: UIPickerView!, didSelectRow row: Int, inComponent component: Int)
{
textfieldBizCat.text = bizCat[row]
pickerBizCat.resignFirstResponder()
}

Answer 4

Swift 4 版本

override func viewDidLoad() {
    super.viewDidLoad()

    pickerView.dataSource = self
    pickerView.delegate = self

    textField.delegate = self
    textField.inputView = pickerView
}

扩展名

// MARK: - UIPickerViewDelegate

extension ViewController: UITextFieldDelegate {

    func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
        pickerView.isHidden = false
        return false
    }
}

// MARK: - UIPickerViewDelegate

extension ViewController: UIPickerViewDelegate, UIPickerViewDataSource {

    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }

    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return myItems.count
    }

    func pickerView( _ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return myItems[row].name
    }

    func pickerView( _ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        textField.text = myItems[row].name
        pickerView.isHidden = true
    }
}

显示UIPickerView文本字段已选中，然后在选中后隐藏

4 个答案: