如何在 UIAlertController 中点击 "Ok" 操作时关闭呈现视图控制器

Question

我试图在 UIAlertAction 的完成处理程序中关闭当前视图控制器，但它并没有关闭。我编写了以下代码（加载指示器只是一个加载警报控制器，当数据成功上传时我将其关闭）：

loadingIndicator.dismiss(animated: true) {                           
      let success = UIAlertController(title: "Successfully Uploaded", message: "", preferredStyle: .alert)
      let ok = UIAlertAction(title: "Ok", style: .default, handler: { _ in
               print("Ok selected") //this is working correctly
               self.dismiss(animated: true, completion: nil) //this is not
      })
                      
      success.addAction(ok)
      self.present(success, animated: true, completion: nil)
}

但是，在单击警报中的“确定”后，会打印“确定已选择”，但不会关闭视图控制器。调试器中没有显示任何其他内容。

Answer 1

尝试在主线程上关闭它，并检查 ViewController 是否在导航层次结构中显示或推送。

loadingIndicator.dismiss(animated: true) {
    let success = UIAlertController(title: "Successfully Uploaded", message: "", preferredStyle: .alert)
    let ok = UIAlertAction(title: "Ok", style: .default, handler: { _ in
        DispatchQueue.main.async {
            self.dismiss(animated: true, completion: nil)
             // If pushed use PopViewController on navigation
             // self.navigationController?.popViewController(animated: true)
        }
    })
    success.addAction(ok)
    self.present(success, animated: true, completion: nil)
}

要检查是否显示 ViewController，请使用 self.isBeingPresented 属性。

如何在 UIAlertController 中点击 "Ok" 操作时关闭呈现视图控制器

How to Dismiss Presenting View Controller when "Ok" Action Tapped in UIAlertController

dismiss

ios

swift

uialertcontroller

uialertaction