ios - 如何将 UIImageView 放置在导航栏上

Question

我试图让黑色圆圈位于红色导航栏之上，但不知道如何实现。这是我目前所拥有的:

override func viewDidAppear(_ animated: Bool) {
    //Adding the button
    let buttonImage = #imageLiteral(resourceName: "button")

    var buttonView : UIImageView {
        let view = UIImageView(image: buttonImage)
        view.translatesAutoresizingMaskIntoConstraints = false
        view.frame = CGRect(x: self.view.frame.maxX - 100, y: -100, width: 200, height: 200)
        view.backgroundColor = .clear
        return view
    }

    super.view.addSubview(buttonView)
}

Answer 1

试试这个。这应该将图像放在导航栏的顶部。

override func viewDidAppear(_ animated: Bool) {
//Adding the button

    navigationController?.navigationBar.addSubview(buttonView)
    let navBar = navigationController?.navigationBar 

    // use this navBar to set your framing and constraints

   let buttonImage = #imageLiteral(resourceName: "button")

    var buttonView : UIImageView {
    let view = UIImageView(image: buttonImage)
    view.translatesAutoresizingMaskIntoConstraints = false
    view.frame = CGRect(x: self.view.frame.maxX - 100, y: -100, width: 200, height: 200)
    view.backgroundColor = .clear
    return view
}

}