带有自定义 UITextField 选项的 UIPickerView

Question

不确定这是否是菜鸟问题，因为这是我第一次使用 UIPickerView。

我班上的 UIPickerView 有这个数组：

let cameraBodies = ["A","B","C","D","E","F","G","H","I","J",
                    "K","L","M","N","O","P","Q","R","S","T",
                    "U","V","W","X","Y","Z","Other"]

当用户点击我的 textField 时，他们可以选择上述字符串。如果用户选择“其他”，我希望 UIPickerView 关闭并更改为普通的 TextField，以便用户可以输入自己的字符串。然后，如果用户删除 textField 中的所有自定义文本，它将返回到 UIPickerView。

我曾想过让 2 个文本字段相互叠加，我会根据用户的选择显示/隐藏它们，但我觉得这不是解决此问题的正确方法。

任何关于如何实现这一点的帮助都会很棒。

这是我课程中与 UIPickerView 相关的部分：

class newCameraController : UIViewController{

    var selectedBody: String?

    var cameraBodyCustomTextField: UITextField = {
        let textField = UITextField()
        textField.placeholder = "Custom Camera Body"
        return textField

    }()

    override func viewDidLoad() {
        super.viewDidLoad()

        createBodyPicker()
        createToolBar()
    }

    func createBodyPicker() {

        let bodyPicker = UIPickerView()
        bodyPicker.delegate = self
        cameraBodyTextField.inputView = bodyPicker
    }

    func createToolBar() {

        let toolBar = UIToolbar()
        toolBar.sizeToFit()

        let doneButton = UIBarButtonItem(title: "Done", style: .plain, target: self, action: #selector(newCameraController.dismissKeyboard))

        toolBar.setItems([doneButton], animated: false)
        toolBar.isUserInteractionEnabled = true
        cameraBodyTextField.inputAccessoryView = toolBar
    }

    override func dismissKeyboard() {
        view.endEditing(true)
    }

extension newCameraController: UIPickerViewDelegate, UIPickerViewDataSource {

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

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

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

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

        selectedBody = cameraBodies[row]
        cameraBodyTextField.text = selectedBody
    }

    func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {

        var label: UILabel

        if let view = view as? UILabel {
            label = view
        } else {
            label = UILabel()
        }

        label.textColor = UIColor(red:0.63, green:0.63, blue:0.63, alpha:1.0)
        label.textAlignment = .center
        label.font = UIFont(name: "Avenir-Medium", size: 16.0)

        label.text = cameraBodies[row]

        return label
    }
}

Answer 1

根据我的意见，解决方案是： 在您的代码中，您显示选择器代替键盘，这是正确的。 现在，当用户选择“Other”时，只需在 cameraBodyTextField 中显示选定的值“Other”。 并在 cameraBodyTextField 下方显示一个额外的文本字段。 显示/隐藏可以通过具有更平滑动画的自动布局高度约束来管理。