#34 在BarButtonItem上實作Pull Down Button選單(menu)按鈕

參考彼得潘的文章，改成在BarButtonItem上實作Pull Down Button

iOS 的選單(menu)按鈕 — Pull Down Button & Pop Up Button

首先用程式建立好一個BarButtonItem

 override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        
        let menuButtonItem = UIBarButtonItem(systemItem: .trash)
    }

接著在menu屬性中建立子物件，這邊不用showsMenuAsPrimaryAction，你也沒得選

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        
        let menuButtonItem = UIBarButtonItem(systemItem: .trash)
        
        menuButtonItem.menu = UIMenu(children: [
            UIAction(title: "Select Messages", image: UIImage(systemName: "checkmark.circle"), handler: { action in
                print("Select Message")
                }),
            UIAction(title: "Edit Pins", image: UIImage(systemName: "pin")) { action in
                print("Edit Pins")
                },
            UIAction(title: "Edit Name and Photo", image: UIImage(systemName: "person.crop.circle"), handler: { action in
                print("Edit Name and Photo")
            })
        ])



    }

最後放到NavigationItem內

    override func viewDidLoad() {
        super.viewDidLoad()

        // ... Create BarButtionItem and Pull Down Menu ...
        
        self.navigationItem.rightBarButtonItem = menuButtonItem

    }

成果

Github原始碼參考

GitHub - purplvampire/MenuButton