关于“声明仅在档案范围有效” [英] About "Declaration is only valid at file scope"

问题描述

我有一个class + extension swift文件。在将另一个文件中声明的委托添加到该类后，Xcode在扩展行显示声明仅在文件范围有效。我不知道是什么问题。

任何人都可以帮我修复吗？

  class ListViewController：UIViewController，AddItemViewControllerDelegate {...} 
 
扩展名ListViewController：UITableViewDataSource {
 func tableView（tableView：UITableView，didSelectRowAtIndexPath indexPath：NSIndexPath）{
 tableView.deselectRowAtIndexPath（indexPath，animated：true）
 performSegueWithIdentifier（ShowDetail，sender：indexPath）
} 
 
} 
  

解决方案

错误在您的 ... - 该错误意味着您的 ListViewController 类没有关闭，所以扩展名被解释为内嵌嵌套，如下所示：

  class ListViewController {
 ... 
 extension ListViewController {
} 
} 
  

找到缺少的大括号，你应该解决问题。

I have a class+extension swift file. After adding a delegate that I declared in another file to the class, the Xcode shows "Declaration is only valid at file scope" at the extension line. I don't know what the problem is.

Can anyone help me to fix it?

class ListViewController: UIViewController, AddItemViewControllerDelegate {...}

extension ListViewController: UITableViewDataSource{
    func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
        tableView.deselectRowAtIndexPath(indexPath, animated: true)
        performSegueWithIdentifier("ShowDetail", sender: indexPath)
    }

}

解决方案

The error is somewhere in your ... — that error means that your ListViewController class didn't get closed, so the extension is being interpreted as nested inside, like this:

class ListViewController {
    ...
    extension ListViewController {
    }
}

Find the missing closing brace and you should solve the problem.

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