Show UIPickerView text field is selected, then hide after selected

问题

I am trying to create a text box that when it is selected a UIPickerView opens up with choices to select from. Once selected, the UIPickerView hides and the selected item is displayed in the text box. I tried different pieces of code I found online but I just can't get it to work. If someone can suggest a complete code for this or tell me what I am doing wrong in my code, that would be super awesome. Thanks so much.

Here is my code:

@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])"

}

回答1:

If I understood well your question, you want:

Have an UITextField which display a text selected
Opening a picker when the user click on the UITextField
Close the picker when an item (in the picker) is selected, and set it in the UITextField

This is the complete code to manage it, you just have to link the delegate of your UITextField:

@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
}

What I changed from your code:

Used UITextFieldDelegate to display the picker when the UITextField is selected
Hide the picker once an item is selected, and setup the UITextField
Set the first row of your picker in the UITextField when any item is selected

回答2:

How about in your didSelectRow method you resignFirstResponder?

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

回答3:

  // 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;

        }

    }

来源：https://stackoverflow.com/questions/26819423/show-uipickerview-text-field-is-selected-then-hide-after-selected

标签

ios

swift

uipickerview