自定义警报创建致命错误：init(coder:) 尚未实现

Question

美好的一天，

我想创建一个自定义警报以从用户那里收集信息。但是，它不会加载并使用以下代码崩溃：

xib 文件

import Foundation
import UIKit

class WorkoutAlert: UIView {
    
    static let instance = WorkoutAlert()
    
    @IBOutlet var parentView: UIView!
    @IBOutlet weak var alertView: UIView!
    @IBOutlet weak var titleLabel: UILabel!
    @IBAction func workoutTextField(_ sender: UITextField) {
        
    }
    
    @IBAction func datePicker(_ sender: UIDatePicker) {
        
    }
    
    
    @IBAction func cancelButtonPressed(_ sender: UIButton) {
        parentView.removeFromSuperview()
    }
    
    @IBAction func doneButtonPressed(_ sender: UIButton) {
        
    }
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        Bundle.main.loadNibNamed("WorkoutAlert", owner: self, options: nil)
        commonInit()
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    private func commonInit () {
        
        alertView.layer.cornerRadius = 10
        parentView.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height)
        parentView.autoresizingMask = [.flexibleHeight, .flexibleWidth]
        
    }
    
    func showAlert(title: String) {
        self.titleLabel.text = title
        
        UIApplication.shared.keyWindow?.addSubview(parentView)
    }
    
// MARK: - End of Code
} 

使用 xib 的 ViewController 的相关代码：

class WorkoutViewController: UIViewController {    

    @IBAction func addButtonPressed(_ sender: UIBarButtonItem) {
                                
        WorkoutAlert.instance.showAlert(title: "Add a new workout")
    }

}

xib 的约束

非常感谢任何帮助。我是一个新手，已经找到了许多创建警报而不是使用标准警报控制器的方法和示例。

Answer 1

您需要根据自己的需要实现 init 方法。但更好地实现两者，你不需要这里的单例模式

class WorkoutAlert: UIView {
    
  
    
    @IBOutlet var parentView: UIView!
    @IBOutlet weak var alertView: UIView!
    @IBOutlet weak var titleLabel: UILabel!
    @IBAction func workoutTextField(_ sender: UITextField) {
        
    }
    
    @IBAction func datePicker(_ sender: UIDatePicker) {
        
    }
    
    
    @IBAction func cancelButtonPressed(_ sender: UIButton) {
        parentView.removeFromSuperview()
    }
    
    @IBAction func doneButtonPressed(_ sender: UIButton) {
        
    }
    
   
    
   required init?(coder: NSCoder) {
        super.init(coder: coder)
        commonInit()
    }
    public override init(frame: CGRect) {
           super.init(frame: frame)
           commonInit()
       }
    
    private func commonInit () {
        Bundle.main.loadNibNamed("WorkoutAlert", owner: self, options: nil)
        alertView.layer.cornerRadius = 10
        parentView.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height)
        parentView.autoresizingMask = [.flexibleHeight, .flexibleWidth]
        
    }
    
    func showAlert(title: String) {
        self.titleLabel.text = title
        
        UIApplication.shared.keyWindow?.addSubview(self)
    }
    
// MARK: - End of Code
} 

在你的控制器中

class WorkoutViewController: UIViewController {    

    @IBAction func addButtonPressed(_ sender: UIBarButtonItem) {
                                
      let alert =  WorkoutAlert(frame: self.view.bounds) // or can set frame here WorkoutAlert(frame: frame here)
      alert.showAlert(title: "Add a new workout")
    }

}