Swift 如何向UINavigationItem添加操作?
我需要动态创建Swift 如何向UINavigationItem添加操作?,swift,xcode,navigation,navigationbar,Swift,Xcode,Navigation,Navigationbar,我需要动态创建导航栏,并在左侧设置取消按钮 这是我如何尝试去做的代码 var navBar: UINavigationBar = UINavigationBar() func setNavBarToTheView() { navBar.frame = CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: 80.0) navBar.backgroundColor = (UIColor.black) le
导航栏
,并在左侧设置取消
按钮
这是我如何尝试去做的代码
var navBar: UINavigationBar = UINavigationBar()
func setNavBarToTheView() {
navBar.frame = CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: 80.0)
navBar.backgroundColor = (UIColor.black)
let navTitle = UINavigationItem(title: "Camera")
let navCancel = UINavigationItem(title: "Cancel")
navBar.setItems([navCancel, navTitle], animated: true)
view.addSubview(navBar)
}
但是,如何将操作侦听器添加到
取消
按钮???UINavigationItem
是一个模型对象,用于存储有关屏幕按钮的信息
您需要的是一个UINavigationItem
,带有leftBarButtonItem
和righBarbuttonItem
设置
let item = UINavigationItem(title: "Title")
item.leftBarButtonItem = UIBarButtonItem(title:"Cancel",
style:.plain,
target:self,
action:#selector(cancelTapped))
navBar.setItems([item], animated: true)