以程序方式设置的barbutton“系统项目”

Question

我想在导航控制器的rightbarbuttonitem上设置共享按钮。我不想添加自定义图像，我想使用Xcode提供的共享按钮图像。这就是我在情节提要中的做法。我设置Style，并将System_Item设置为Action。

现在的问题是，如果我以编程方式创建barbuttonitem，该如何以编程方式设置System_Item？

let shareButton = UIBarButtonItem(title: "",
                                  style: .plain,
                                  target: self,
                                  action: #selector(shareAction(sender:)))
    shareButton.tintColor = AppColor.barButtonColor

    navigationItem.rightBarButtonItem = shareButton

Answer 1

您可以创建扩展名来执行此操作->

public extension UIViewController {

    func setRightBarButtonItem(tintColor: UIColor = AppColor.barButtonColor) {
        let button = UIButton(type: .system)

        button.setTitle("RightButton", for: .normal)
        button.setTitleColor(tintColor, for: .normal)

        button.translatesAutoresizingMaskIntoConstraints = false

        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(tap))
        button.addGestureRecognizer(tapGesture)

        navigationItem.rightBarButtonItem = UIBarButtonItem(customView: button)
    }

    @objc func tap() {
        // Do stuff
    }
}

然后在您的ViewController中

override func viewDidLoad() {
    super.viewDidLoad()
    setRightBarButtonItem()

    // OR

    setRightBarButtonItem(tintColor: .blue)
}

Answer 2

您需要使用systemicon选项进行共享操作

let share = UIBarButtonItem(barButtonSystemItem: .action, target: self, action: #selector(shareAction(sender:)))
    navigationItem.rightBarButtonItem = share