如何在Swift的导航栏顶部显示自定义视图？

Question

So the way I understand navigation bar (navigation item) is that it has three locations you can modify, which is left ( leftBarButtomItem ), middle ( titleView ), and right ( rightBarButtonItem ).

Now what I'm going to achieve is that I want to just add a simple progress bar line at the very bottom of navigation bar, but still inside navigation bar. I want to make this like an extension of navigation bar that I can reuse on other screens. But I want that left, middle, and right "views" are still working like usual. eg I don't want that if I change the title view content manually in other view controller, then the line disappears / stops working for that other view controller. So this will feel like an independent overlay added on top of navigation bar as subview, separated from leftBarButtonItem , titleView , and rightBarButtonView , sort to speak.

Is it possible to do that in navigation item?

Answer 1

This is a example of how to add a Image instead of a Title String

fileprivate func setupTitle(){

    let logo = UIImage(named: "my_incredible_logo")
    let imageView = UIImageView(image:logo)
    imageView.contentMode = .scaleAspectFit

    self.navigationItem.titleView = imageView
    self.navigationController?.navigationBar.prefersLargeTitles = false
}