我有一个嵌入导航控制器的MainViewController,如下所示:
在MainViewController.swift中,我以编程方式添加了两个UIBarButtonItem(左和右):
class MainViewController: UIViewController {
let rightButton = UIBarButtonItem(title: "Right", style: .plain, target: self, action: #selector(onRightClick))
let leftButton = UIBarButtonItem(title: "Left", style: .plain, target: self, action: #selector(onLeftClick))
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.rightBarButtonItem = rightButton
navigationItem.leftBarButtonItem = leftButton
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
@objc func onRightClick() {
print("[Main] Right Click")
}
@objc func onLeftClick() {
print("[Main] Left Click")
}
}
按钮确实显示在屏幕上,但有趣的是,每当我按下向左或向右按钮时,选择器功能onLeftClick
和onRightClick
都不会被调用。我有什么办法让它有效吗?我正在使用Xcode 9.3。
尝试使用内部范围一次
override func viewDidLoad() {
super.viewDidLoad()
let rightButton = UIBarButtonItem(title: "Right", style: .plain, target: self, action: #selector(self.onRightLeftClick(_ :)))
rightButton.tag = 1
let leftButton = UIBarButtonItem(title: "Left", style: .plain, target: self, action: #selector(self.onRightLeftClick(_ :)))
rightButton.tag = 2
self.navigationItem.rightBarButtonItem = rightButton
self.navigationItem.leftBarButtonItem = leftButton
}
处理动作为
func onRightLeftClick(_ sender: UIBarButtonItem){
if sender.tag == 1{
// rightButton action
}else{
// leftButton action
}
}