采取 UIAlertAction 后视图未关闭

Question

所以我使用带有 Action Sheet 样式的 UIAlertController 来显示两个选项，一个用于取消操作，另一个用于删除数据。按钮工作正常，删除按钮工作，操作 Sheet 关闭。我的问题是，在后台从云中删除数据后，视图本身不会消失。为什么视图不自行消失？

@IBAction func deleteRecipePressed() {
// Create the alert controller
let actionSheetController: UIAlertController = UIAlertController(title: "Delete Recipe?", message: "Are you positive you want to delete this recipe? This action can not be undone!", preferredStyle: .ActionSheet)

// Create and add the cancel action
let cancelAction: UIAlertAction = UIAlertAction(title: "Cancel", style: .Cancel, handler: {action -> Void in
  // Just dismiss the action sheet
})
actionSheetController.addAction(cancelAction)

// Create and add the delete action
let deleteAction: UIAlertAction = UIAlertAction(title: "Delete", style: .Default, handler: {action -> Void in
  // Set deleteRecipe to true to flag for deletion
  self.deleteRecipe = true
})
actionSheetController.addAction(deleteAction)

// Present the alert
self.presentViewController(actionSheetController, animated: true, completion: nil)

// If flagged for deletion, delete the recipe and dismiss the view
if (deleteRecipe == true) {
  recipeObject.deleteInBackground()
  self.dismissViewControllerAnimated(true, completion: nil)
}
}

Answer 1

此代码 -

// If flagged for deletion, delete the recipe and dismiss the view
if (deleteRecipe == true) {
  recipeObject.deleteInBackground()
  self.dismissViewControllerAnimated(true, completion: nil)
}

显示操作 sheet 后立即执行。即在用户选择任一选项之前。 self.presentViewController(actionSheetController, animated: true, completion: nil) 不阻塞当前线程。

您需要删除项目并在 delete 选项的处理程序中关闭视图 -

let deleteAction: UIAlertAction = UIAlertAction(title: "Delete", style: .Default, handler: {action -> Void in
  recipeObject.deleteInBackground()
  self.dismissViewControllerAnimated(true, completion: nil)
})

采取 UIAlertAction 后视图未关闭

View not dismissing after UIAlertAction taken

ios

swift

uialertcontroller