如何在我的视图控制器中的“全部删除”和“保存”按钮上添加警报？

编程问答 2022-06-12

问题描述

我已通过编程方式在viewController中添加了按钮，我想在点击会出现警报的按钮时添加警报，并删除TableViewCell中所有已添加的项目。我怎样才能做到这一点？点击保存按钮时，也会显示保存按钮的警报。 谢谢。

class IncallPantryCheckViewController {

let deleteallButton: UIButton = {
        let button = UIButton()
        button.setTitle("Delete All",for: .normal)
        button.titleLabel!.font = UIFont(name: "HelveticaNeue-Bold",size: 20.0)!
        button.setTitleColor(UIColor.orange,for: UIControlState.normal)
        return button
    }()
  

 override func viewDidLoad() {
        super.viewDidLoad()
        
        inCallTableView.register(UINib(nibName: "PantryCheckInCallTableViewCell",bundle: Bundle.main),forCellReuseIdentifier: "PantryCheckInCallTableViewCell")
        
view.addSubview(deleteallButton)
view.addSubview(saveButton)

deleteallButton.translatesAutoresizingMaskIntoConstraints = false
deleteallButton.bottomAnchor.constraint(equalTo: view.bottomAnchor,constant: -20).isActive = true
deleteallButton.leftAnchor.constraint(equalTo: self.view.leftAnchor,constant: 45).isActive = true
        
saveButton.translatesAutoresizingMaskIntoConstraints = false
saveButton.bottomAnchor.constraint(equalTo: view.bottomAnchor,constant: -20).isActive = true
saveButton.rightAnchor.constraint(equalTo: self.view.rightAnchor,constant: -45).isActive = true
    



 }
}

解决方法

我假设您要使用iOS提供的警报：

  1. 创建功能以显示删除警报并实际执行删除操作：

     @objc func tappedDelete() {
     let alertController = UIAlertController(title: "Alert",message: "Are you sure you want to delete?",preferredStyle: .alert)
     alertController.addAction(UIAlertAction(title: "YES",style: .destructive,handler: { _ in
         self.performDelete()
     }))
     alertController.addAction(UIAlertAction(title: "NO",style: .cancel,handler: nil))

     // present alert,pick one depending if you're using a navigation controller or not.
     //    self.navigationController?.present(alertController,animated: true,completion: nil)
     //    self.present(alertController,completion: nil)
 }

 func performDelete() {
     print("Do your delete logic here")
 }

  2. 将目标操作添加到您的按钮：

     deleteAllButton.addTarget(self,action: #selector(tappedDelete),for: .touchUpInside)

在上方重复您的保存按钮。

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