ios 使用 Button 和 Title Swift 以编程方式创建 NavBar
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Create NavBar programmatically with Button and Title Swift
提问by Fabian Boulegue
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
我尝试创建一个 NavBar，到目前为止 NavBar 没有问题，但是当我尝试添加按钮和标题时，它们没有显示
My NavBar look like
我的导航栏看起来像
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)
so i try to set my NavBar title like
所以我尝试将我的 NavBar 标题设置为
navigationBar.topItem.title = "some title"
or
navigationBar.title = "some title"
but both fail.
Also if i try to set a button
但两者都失败了。
另外，如果我尝试设置一个按钮
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
this does not give me a error but the button is simply not displayed
这不会给我一个错误，但按钮根本没有显示
回答by tesla
Updated for Swift 5
为 Swift 5 更新
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.
创建一个导航项实例并为其设置标题和右/左按钮。配置导航项后，将其添加到导航栏。
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)
回答by David Seek
Basically azimov's answer in Swift 4
基本上 azimov 在Swift 4 中的回答
override func viewDidLoad() {
super.viewDidLoad()
self.setNavigationBar()
}
func setNavigationBar() {
let screenSize: CGRect = UIScreen.main.bounds
let navBar = UINavigationBar(frame: CGRect(x: 0, y: 0, width: screenSize.width, height: 44))
let navItem = UINavigationItem(title: "")
let doneItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.done, target: nil, action: #selector(done))
navItem.rightBarButtonItem = doneItem
navBar.setItems([navItem], animated: false)
self.view.addSubview(navBar)
}
@objc func done() { // remove @objc for Swift 3
}
