swift - 如何在不使用 UITextField 的情况下将 UIToolbar 添加到 UIPickerView？

Question

我在没有 UITextField 的情况下使用了 UIPickerView。用户点击按钮后，将显示 UIPickerView。

无论如何，我不知道如何关闭 UIPickerView。我试图用 UIToolbar 设置 inputAccessoryView 但编译器说它是 get-only 属性。

我的代码:

    let toolbar = UIToolbar()
    toolbar.barStyle = UIBarStyle.default
    toolbar.isTranslucent = true
    toolbar.sizeToFit()

    let doneButton = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.done, target: self, action: #selector(RegisterViewController.pickerDoneButton))
    let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace, target: self, action: nil)
    let cancelButton = UIBarButtonItem(title: "Cancel", style: UIBarButtonItemStyle.plain, target: self, action: #selector(RegisterViewController.pickerCancelButton))

    toolbar.setItems([cancelButton, spaceButton, doneButton], animated: true)
    toolbar.isUserInteractionEnabled = true

    pickerView.inputAccessoryView = toolbar

Error: Cannot assign to property: 'inputAccessoryView' is a get-only property

Answer 1

尝试将 subview 添加到 UIPickerView