在导航栏上设置对backButtonItem的操作,可以通过以下步骤实现:
- 首先,在需要设置backButtonItem的UIViewController中,重写navigationItem的setBackBarButtonItem方法:override func setNavigationBarBackButtonItem(_ backButtonItem: UIBarButtonItem?) {
super.setNavigationBarBackButtonItem(backButtonItem)
// 在此处添加自定义操作
}override func setNavigationBarBackButtonItem(_ backButtonItem: UIBarButtonItem?) {
super.setNavigationBarBackButtonItem(backButtonItem)
if let backButtonItem = backButtonItem {
backButtonItem.title = "返回"
backButtonItem.image = UIImage(named: "back_icon")
}
}override func viewDidLoad() {
super.viewDidLoad()
// 设置backButtonItem
let backButtonItem = UIBarButtonItem(title: "返回", style: .plain, target: self, action: #selector(backButtonTapped))
navigationItem.backBarButtonItem = backButtonItem
}@objc func backButtonTapped() {
// 在此处添加自定义操作
navigationController?.popViewController(animated: true)
}通过以上步骤,可以在导航栏上设置对backButtonItem的操作,并实现自定义的点击事件。
- 在setNavigationBarBackButtonItem方法中,可以添加自定义操作,例如设置backButtonItem的标题和图片:
- 在需要设置backButtonItem的UIViewController中,重写viewDidLoad方法,并设置navigationItem的backBarButtonItem属性:
- 在需要设置backButtonItem的UIViewController中,添加backButtonTapped方法,用于处理backButtonItem的点击事件: