使用if语句快速检查在不同类别中选择了哪个按钮

Question

我有4个不同的按钮，它们通向相同的视图控制器SearchPage()，因此，我在主yearOne类中将这些按钮分配如下：

class yearOne: UICollectionViewController：

    @objc func buttonAction(sender: UIButton!) {
        var tagVal : NSInteger = sender.tag
        switch sender.tag {
        case 0:
            print("ONEEE")
            let destination = SearchPage()
            navigationController?.pushViewController(destination, animated: true)
        case 1:
            print("TWOOO")
            let destination = SearchPage()
            navigationController?.pushViewController(destination, animated: true)
        case 2:
            print("THREEE")
            let destination = SearchPage()
            navigationController?.pushViewController(destination, animated: true)
        case 3:
            print("FOURRR")
            let destination = SearchPage()
            navigationController?.pushViewController(destination, animated: true)
        default:
            let destination = SearchPage()
            navigationController?.pushViewController(destination, animated: true)
        }

    }

每个按钮在不同的类别中

class fallQuarterCell: UICollectionViewCell, UITableViewDelegate, UITableViewDataSource：

    let addButton : UIButton = {
        let button = UIButton()//frame: CGRect(x: 345, y: 10, width: 30, height: 30))
        button.setImage(UIImage(named: "addicon"), for: .normal)
        button.imageEdgeInsets = UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)
        button.tag = 0
        button.addTarget(self, action: #selector(yearOne.buttonAction), for: .touchUpInside)
        return button
    }()

class winterQuarterCell: UICollectionViewCell, UITableViewDelegate, UITableViewDataSource：

    let addButton : UIButton = {
        let button = UIButton()//frame: CGRect(x: 345, y: 10, width: 30, height: 30))
        button.setImage(UIImage(named: "addicon"), for: .normal)
        button.imageEdgeInsets = UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)
        button.tag = 1
        button.addTarget(self, action: #selector(yearOne.buttonAction), for: .touchUpInside)
        return button
    }()

依此类推，使用第三个和第四个按钮。无论如何，该按钮都可以正常工作，并且每个按钮都能正确打印并发送到SearchPage()

但是，在我的SearchPage()类中，我试图重新调用sender.tag？这样我就可以在按下/选择哪个按钮时使用if / else语句。

    let mainvc = yearOne()
    let vc = fallQuarterCell()
    let vc2 = winterQuarterCell()
    let vc3 = springQuarterCell()
    let vc4 = summerQuarterCell()

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){

        tableView.deselectRow(at: indexPath, animated: true)

        if (mainvc.tagValue == 0){
            if (resultSearchController.isActive){

                vc.data.append(filteredCourses[indexPath.row])
                UserDefaults.standard.set(vc.data, forKey: "SavedArray")

                navigationController?.popViewController(animated: true)

            }
            else{
                vc.data.append(allCourses[indexPath.row] as! String)
                UserDefaults.standard.set(vc.data, forKey: "SavedArray")

                navigationController?.popViewController(animated: true)

            }
        }
        else if (mainvc.tagValue == 1){
            if (resultSearchController.isActive){
                vc2.data.append(filteredCourses[indexPath.row])
                UserDefaults.standard.set(vc2.data, forKey: "SavedArray2")
                vc2.tableView.reloadData()
                navigationController?.popViewController(animated: true)
            }
            else{
                vc2.data.append(allCourses[indexPath.row] as! String)
                UserDefaults.standard.set(vc2.data, forKey: "SavedArray2")
                vc2.tableView.reloadData()
                navigationController?.popViewController(animated: true)
            }
        }

    }

有人对我该如何处理有任何想法吗？现在，因为我在按钮功能中添加了tagVal，所以yearOne又名mainvc似乎没有成员。

Answer 1

您需要在SearchPage视图控制器上设置一个值来捕获标记。

class SearchPage: UIViewController {
  var tag: Int?
  ...
}

然后在您的switch语句中，您应该执行以下操作。

case 0:
  print("ONEEE")
  let destination = SearchPage()
  destination.tag = sender.tag // <- update the tag value here
  navigationController?.pushViewController(destination, animated: true)

您还应该删除let mainVC = yearOne()，因为这是yearOne类的新实例，并且与您以前创建的yearOne没有关系。

Answer 2

您可以在SearchPage中保留对原始YearOne的引用：

class SearchPage: UIViewController {
    var vc: YearOne?
}

然后您的切换案例代码将如下所示：

print("ONEEE")
let destination = SearchPage()
destination.vc = self
navigationController?.pushViewController(destination, animated: true)