ios - 动态 UIPickerView 菜单

Question

我正在尝试创建一个使用 2 个文本字段和 1 个选择器 View 的应用程序。一旦用户单击第一个文本字段，选择器就会弹出。用户从菜单中进行选择并单击第二个文本字段后，选择器会再次弹出，但菜单取决于第一个文本字段中的文本(之前的选择)。

我遇到的问题是，当单击第二个字段时显示选择器时(在做出第一个选择并显示在第一个文本弓中之后)，菜单不显示第二阶段的选择。

    import UIKit

    class ViewController: UIViewController, UITextFieldDelegate, UIPickerViewDataSource, UIPickerViewDelegate {

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

var activeTextField = 0

@IBOutlet var picker: UIPickerView!

var characters = ["Letter", "Number"]
var letters = ["A", "B", "C", "D"]
var numbers = ["1", "2", "3", "4", "5"]


override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    picker.hidden = true
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


func textFieldDidBeginEditing(textField: UITextField) {

    textField.resignFirstResponder()

    if (textField == textField1) {

        activeTextField = 0

    }
    else if (textField == textField2) {

        activeTextField = 1

    }

    picker.hidden = false

}

func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {

    return 1

}


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

    if (activeTextField == 0) {
        return characters.count

    }
    else if (textField1.text == "Letter") {
            return letters.count
    }
    else if (textField1.text == "Number") {
        return numbers.count

    }


    return component
}

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

    picker.hidden = true
    if (activeTextField == 0) {
        textField1.text = characters[row]
        picker.reloadAllComponents()
    }
    else if (textField1.text == "Letter") {
            textField2.text = letters[row]
    }
    else if (textField1.text == "Number") {
            textField2.text = numbers[row]


    }

}


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

    if (activeTextField == 0) {
        return characters[row]

    }
    else if (textField1.text == "Letter") {
            return letters[row]
        }
    else if (textField1.text == "Number") {
        return numbers[row]

    }

    return nil
}


deinit {
    self.picker.delegate = nil
    self.picker.dataSource = nil
}
    }

我还想指出，点击几次后，滚动选择器并进行选择，菜单保持不变(仍然显示“字母”和“数字”)但实际选择的值是“正确的”。请帮助我完成这项工作。提前致谢。

Answer 1

在函数textFieldDidBeginEditing中，在调用picker.hidden = false之前，重新加载pickerview。