向 UI 添加操作 动态按钮项 Swift 4.

Question

let doneButton = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.plain, target: self, action: #selector(buttonClicked(sender:)))
@objc func buttonClicked(sender: UIBarButtonItem) {
print("Hello")
}

这是我的UIBarButton的代码，但是当我单击它时，它不会打印"Hello"，可能有什么问题？

编辑：这是我的视图控制器 它只是控制一个按钮，当单击它时显示微调器及其控件，但正如我之前所说，工具栏上的按钮不起作用

class FilterViewController: UIViewController {
var search: Search?
let categoriesSpinnerDelegate = CategoriesPickerDelegate()
@IBOutlet weak var generalSpinner: UIPickerView!
@IBOutlet weak var categoriesButton: UIButton!
@IBOutlet weak var categoryRow: UIView!
var doneButton: UIBarButtonItem?
override func viewDidLoad() {
super.viewDidLoad()
self.navigationController?.topViewController?.title = "Filtri"
// Set border and click action
self.categoryRow.layer.borderWidth = 1
self.categoryRow.layer.borderColor = Raccoltacase.lightGray.cgColor
self.categoryRow.addGestureRecognizer(UIPanGestureRecognizer(target: self, action: #selector(self.buttonClicked(sender:))))
// Create toolbar and attach it to pickerView
let toolBar = UIToolbar()
toolBar.barStyle = UIBarStyle.default
toolBar.isTranslucent = true
//toolBar.tintColor = UIColor(red: 76/255, green: 217/255, blue: 100/255, alpha: 1)
toolBar.sizeToFit()
self.doneButton = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.plain, target: self, action: #selector(buttonClicked(sender:)))
let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace, target: nil, action: nil)
let cancelButton = UIBarButtonItem(title: "Cancel", style: UIBarButtonItemStyle.plain, target: self, action: nil)
toolBar.setItems([cancelButton, spaceButton, doneButton!], animated: false)
toolBar.isUserInteractionEnabled = true
generalSpinner.addSubview(toolBar)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func categoriesButtonClick(_ sender: UIButton) {
self.generalSpinner.showsSelectionIndicator = true
self.generalSpinner.dataSource = categoriesSpinnerDelegate
self.generalSpinner.delegate = categoriesSpinnerDelegate
self.generalSpinner.isHidden = false
}
@objc func buttonClicked(sender: UIBarButtonItem) {
print("Hello")
}
}

屏幕

Answer 1

假设您有时会显示选取器(并在用户按下完成按钮时将其关闭(，这是我的解决方案：

1. 将UITextField添加到情节提要中的视图(并使色调颜色透明 (clearColor((

2. 将UIToolbar作为inputAccessoryView添加到UITextField

3. 将UIPickerView作为输入视图添加到工具栏(另请参阅下面的注释(

下面是一个示例代码：

override func viewDidLoad() {
super.viewDidLoad()
textField.inputView = generalSpinner
textField.inputAccessoryView = getToolbar()
}
func getToolbar() -> UIToolbar {
let toolBar = UIToolbar(frame:         CGRect(x: 0, y: 0, width: self.view.frame.width, height: 40))
toolBar.barStyle = UIBarStyle.default
toolBar.isTranslucent = true
self.doneButton = UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.plain, target: self, action: #selector(buttonClicked(sender:)))
let spaceButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.flexibleSpace, target: nil, action: nil)
let cancelButton = UIBarButtonItem(title: "Cancel", style: UIBarButtonItemStyle.plain, target: self, action: nil)
toolBar.setItems([cancelButton, spaceButton, doneButton!], animated: false)
toolBar.isUserInteractionEnabled = true
return toolBar
}

注意：如果 UIPickerView 已在情节提要(或其他视图的子视图(中，请确保在 viewDidLoad 的第一行中删除它(如下所示(：

override func viewDidLoad() {
super.viewDidLoad()
generalSpinner.removeFromSuperview()
textField.inputView = generalSpinner
textField.inputAccessoryView = getToolbar()
}

Answer 2

已解决 当我使用pickerView.addSubView(toolbar)时，工具栏被放置在选择器视图后面，因此不可单击。我解决了从故事板手动添加工具栏

的问题，General Spinner.top = Picker Toolbar.bottom