如何在 Swift 中使用 UISwitch 在 tablewiew 中禁用/启用通知

问题描述

我正在开发基于位置的提醒应用。我显示用户在表视图上创建的所有提醒。我也在每个单元格上都有 UISwitch 。我希望 UISwitch 单独禁用/启用提醒，而不是所有通知。我想不通。

    
extension MainViewController: UITableViewDataSource{
    func tableView(_ tableView: UITableView,heightForRowAt indexPath: IndexPath) -> CGFloat {
        return 100
    }
    
    func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
    
    func tableView(_ tableView: UITableView,numberOfRowsInSection section: Int) -> Int {
        return self.items?.count ?? 0
    }
    
    func tableView(_ tableView: UITableView,cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        //let cell = tableView.dequeueReusableCell(withIdentifier: "itemCell",for: indexPath)
        let cell = tableView.dequeueReusableCell(withIdentifier: "itemCell",for: indexPath) as! itemTableViewCell
        
        let item = self.items![indexPath.row]
        cell.itemTitle?.text = item.itemName
        cell.itemSubTitle?.text = item.itemDescription
        
        
        
        //switch
            let swicthView = UISwitch(frame: .zero)
            swicthView.onTintColor = UIColor (named: "DingerBlue")
            swicthView.seton(true,animated: true)
            swicthView.tag = indexPath.row
            swicthView.addTarget(self,action: #selector(self.SwitchBtn(_:)),for: .valueChanged)
            cell.accessoryView = swicthView
            let itemToRemove = self.items![indexPath.row]
            let notifToRemove: String = itemToRemove.notifID!
        
            return cell
        
    }
    @objc func switchDidChanged(_ sender: UISwitch){
        
      
        print("Switch value is \(sender.isOn)")

        if(sender.isOn){
            print("on")
            UIApplication.shared.registerForRemoteNotifications()
        }
        else{
            print("Off")
            UNUserNotificationCenter.current().removePendingNotificationRequests(withIdentifiers: [notifToRemove])
            
        }
        
    }
}

解决方法

我相信您的代码不起作用，因为单元格被重用，并且特定单元格上的操作应该从单元格类而不是从 ViewController 处理。将此代码移至 UITableViewCell 代码中。

let swicthView = UISwitch(frame: .zero)
swicthView.onTintColor = UIColor (named: "DingerBlue")
swicthView.setOn(true,animated: true)
swicthView.tag = switchViewTag!
swicthView.addTarget(self,action: #selector(self.SwitchBtn(_:)),for: .valueChanged)

 @objc func switchDidChanged(_ sender: UISwitch){
    
  
    print("Switch value is \(sender.isOn)")

    if(sender.isOn){
        print("on")
        UIApplication.shared.registerForRemoteNotifications()
    }
    else{
        print("Off")
        UNUserNotificationCenter.current().removePendingNotificationRequests(withIdentifiers: [notifToRemove])
        
    }
    
}

并在 UITableViewCell

中添加新属性

weak var switchViewTag: Int?

将您的 cellForRowAt 委托方法修改为

func tableView(_ tableView: UITableView,cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    //let cell = tableView.dequeueReusableCell(withIdentifier: "itemCell",for: indexPath)
    let cell = tableView.dequeueReusableCell(withIdentifier: "itemCell",for: indexPath) as! itemTableViewCell
    
    let item = self.items![indexPath.row]
    cell.itemTitle?.text = item.itemName
    cell.itemSubTitle?.text = item.itemDescription
    cell.switchViewTag = indexPath.row

    return cell

    }