使用Button和Title Swift以编程方式创建NavBar

本文介绍了使用Button和Title Swift以编程方式创建NavBar的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我尝试创建NavBar，到目前为止，NavBar没问题，但是当我尝试添加按钮和标题时，它们不会显示

I try to create a NavBar, so far the NavBar is no problem but when I try to add the buttons and title, they don't get displayed

我的NavBar看起来像

My NavBar look like

let NameHeight = screenHeight * 0.09 let NameWidth = screenWidth let navBar: UINavigationBar = UINavigationBar(frame: CGRect(x: 0, y: 0, width: NameWidth, height: NameHeight)) self.view.addSubview(navBar)

所以我尝试将NavBar标题设置为

so i try to set my NavBar title like

navigationBar.topItem.title = "some title" or navigationBar.title = "some title"

但是都失败了. 另外，如果我尝试设置按钮

but both fail. Also if i try to set a button

let btnName = UIButton() btnName.setImage(UIImage(named: "imagename"), forState: .Normal) btnName.frame = CGRectMake(0, 0, 30, 30) btnName.addTarget(self, action: Selector("action"), forControlEvents: .TouchUpInside) //.... Set Right/Left Bar Button item let rightBarButton = UIBarButtonItem() rightBarButton.customView = btnName self.navigationItem.rightBarButtonItem = rightBarButton

这不会给我带来错误，但是按钮根本不会显示

this does not give me a error but the button is simply not displayed

推荐答案

已针对Swift 5更新

创建一个导航项目实例，并为其设置标题和向右/向左按钮.配置导航项后，将其添加到导航栏中.

Create a navigation item instance and set title and right/left buttons to it. After navigation item is configured add it to the navigation bar.

let navBar = UINavigationBar(frame: CGRect(x: 0, y: 0, width: view.frame.size.width, height: 44)) view.addSubview(navBar) let navItem = UINavigationItem(title: "SomeTitle") let doneItem = UIBarButtonItem(barButtonSystemItem: .done, target: nil, action: #selector(selectorName:)) navItem.rightBarButtonItem = doneItem navBar.setItems([navItem], animated: false)