Multiple pickerviews with multiple textfield inputviews Swift

问题

I've been searching through the forum and nothing has helped. I am using 4 text fields in one view controller, and for each textfield, I am using a separate pickerView as the inputViews for the textFields (4pickers).

When I click on the first textField, pickerView1 successfully appears and the textfield displays the data, however when I click on the second, third and fourth textfields,the first pickerView appears. I suspect the error lies in the inputView declarations.

And I would so appreciate it if you could help add a "done" button to the pickerView.

My code:

class ViewController1: UIViewController, UIPickerViewDelegate
{

    @IBOutlet var pickerView1: UIPickerView!
    @IBOutlet var pickerView2: UIPickerView!
    @IBOutlet var pickerView3: UIPickerView!
    @IBOutlet var pickerView4: UIPickerView!

    @IBOutlet var textField1: UITextField!
    @IBOutlet var textField2: UITextField!
    @IBOutlet var textField3: UITextField!
    @IBOutlet var textField4: UITextField!

    var hazards = ["a","b", "c"]
    var reasons = ["d", "e", "f"]
    var site = ["v","h","i","j"]
    var line = ["k", "l","m", "n"]

    override func viewDidLoad() {

        super.viewDidLoad()
        pickerView1 = UIPickerView()
        pickerView2 = UIPickerView()
        pickerView3 = UIPickerView()
        pickerView4 = UIPickerView()
        pickerView1.delegate = self
        pickerView2.delegate = self
        pickerView3.delegate = self
        pickerView4.delegate = self

        self.textField1.inputView = self.pickerView1;
        self.textField2.inputView = self.pickerView2;
        self.textField3.inputView = self.pickerView3;
        self.textField4.inputView = self.pickerView4;
    }

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

    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {

        if pickerView.tag == 0 {
            return hazards.count
        } else if pickerView.tag == 1 {
            return reasons.count
        } else if pickerView.tag == 2 {
            return  site.count
        } else if  pickerView.tag == 3 {
            return line.count
        }
        return 1
    }

    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {

        if pickerView.tag == 0 {
            return hazards[row]
        } else if pickerView.tag == 1 {
            return reasons[row]
        } else if pickerView.tag == 2 {
            return site[row]
        } else if pickerView.tag == 3 {
            return line[row]
        }

        return ""
    }

    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)  {

        if pickerView.tag == 0 {
            textField1.text = hazards[row]
        } else if pickerView.tag == 1 {
            textField2.text = reasons[row]
        } else if pickerView.tag == 2 {
            textField3.text = site[row]
        } else if pickerView.tag == 3 {
            textField4.text = line[row]
        }
    }
}

回答1:

You're using the picker views' tag property to decide which array is the data source for a given picker view, but you didn't set the tags initially. The tag defaults to zero, so all four picker views are showing the same data. After instantiating your picker views, add this:

pickerView1.tag = 0
pickerView2.tag = 1
pickerView3.tag = 2
pickerView4.tag = 3

来源：https://stackoverflow.com/questions/26488250/multiple-pickerviews-with-multiple-textfield-inputviews-swift

标签

swift

uitextfield

uipickerview