Question

我在ios应用程序中的UIpickerView上添加了取消和完成按钮，但我收到错误 - [Avakaash.Profile_add_update donePicker ]：无法识别的选择器发送到实例0x7faf19daf1f0' ，我的代码如下所示 -

    override func viewDidLoad() {
    super.viewDidLoad()

    std_class_pickerView.tag = 0
    country_pickerview.tag = 1



    std_class_pickerView = UIPickerView(frame: CGRectMake(0, 200, view.frame.width, 300))
    std_class_pickerView.backgroundColor = .whiteColor()
    std_class_pickerView.showsSelectionIndicator = true


    let toolBar = UIToolbar()
    toolBar.barStyle = UIBarStyle.Default
    toolBar.translucent = true
    toolBar.tintColor = UIColor(red: 76/255, green: 217/255, blue: 100/255, alpha: 1)
    toolBar.sizeToFit()

    let doneButton = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.Bordered, target: self, action: Selector("donePicker"))
    let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.FlexibleSpace, target: nil, action: nil)
    let cancelButton = UIBarButtonItem(title: "Cancel", style: UIBarButtonItemStyle.Bordered, target: self, action: Selector("canclePicker"))

    toolBar.setItems([cancelButton, spaceButton, doneButton], animated: false)
    toolBar.userInteractionEnabled = true

    std_class_pickerView.delegate = self

    text_std_class.inputView = std_class_pickerView

    text_std_class.inputAccessoryView = toolBar
    }

我的控制器类看起来像 -

 class Profile_add_update: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {
      }

错误日志 -

     [Avakaash.Profile_add_update donePicker]: unrecognized selector sent to instance 0x7faf19daf1f0
     2016-08-18 17:04:13.653 Avakaash[2999:227329] *** Terminating app due to   uncaught exception 'NSInvalidArgumentException', reason: 
    '-      [Avakaash.Profile_add_update donePicker]: unrecognized selector 
     sent to instance 0x7faf19daf1f0'

     libc++abi.dylib: terminating with uncaught exception of type NSException
     (lldb)

Answer 1

您忘记实施donePicker和canclePicker按钮的操作

func donePicker () //Create an IBAction
    {
   // do something

  }

func canclePicker () //Create an IBAction
    {
   // do something

  }

完整代码

  let toolBar = UIToolbar()
    toolBar.barStyle = UIBarStyle.Default
    toolBar.translucent = true
    toolBar.tintColor = UIColor(red: 76/255, green: 217/255, blue: 100/255, alpha: 1)
    toolBar.sizeToFit()

    let doneButton = UIBarButtonItem(title: "Done", style:.Plain, target: self, action: #selector(ViewController.donePicker))
    let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.FlexibleSpace, target: nil, action: nil)
    let cancelButton = UIBarButtonItem(title: "Cancel", style:.Plain, target: self, action: #selector(ViewController.canclePicker))

    toolBar.setItems([cancelButton, spaceButton, doneButton], animated: false)
    toolBar.userInteractionEnabled = true

像

这样的行动

func donePicker () //Create an IBAction
{
    // do something

}

func canclePicker () //Create an IBAction
{
    // do something

}

Answer 2

您似乎已将此问题（Add buttons to UIPickerView - Swift 1.2）的答案剪切并粘贴到您的应用程序中，而不了解其工作原理。这不是学习如何编写代码的好方法。

错误消息告诉您正在尝试调用名为“donePicker”的选择器（或函数或操作），但不存在此类选择器。您需要在名为“donePicker”的类中创建一个操作（还有一个名为“canclePicker”（sic。）），以使您的代码能够正常工作。

donePicker：发送到实例的无法识别的选择器

2 个答案: