Presenting a UIAlertController properly on an iPad using iOS 8

Question

With iOS 8 0  Apple introduced UIAlertController to replace UIActionSheet  Unfortunately  Apple didn t add any information on how to present it  I found an entry about it on hayaGeek s blog  however  it doesn t seem to work on iPad  The view is totally misplaced   Misplaced    Correct    I use the following code to show it on the interface       let alert   UIAlertController          setting buttons     self presentModalViewController alert  animated  true    Is there another way to add it for iPad  Or did Apple just forget the iPad  or not implemented  yet

User · Answer

In Swift 2  you want to do something like this to properly show it on iPhone and iPad   func confirmAndDelete sender  AnyObject        guard let button   sender as  UIView else           return            let alert   UIAlertController title  NSLocalizedString  Delete Contact    comment       message  NSLocalizedString  This action will delete all downloaded audio files    comment       preferredStyle   ActionSheet      alert modalPresentationStyle    Popover      let action   UIAlertAction title  NSLocalizedString  Delete   comment       style   Destructive    action in         EarPlaySDK deleteAllResources             let cancel   UIAlertAction title  NSLocalizedString  Cancel   comment       style   Cancel    action in            alert addAction cancel      alert addAction action       if let presenter   alert popoverPresentationController           presenter sourceView   button         presenter sourceRect   button bounds           presentViewController alert  animated  true  completion  nil      If you don t set the presenter  you will end up with an exception on iPad in - UIPopoverPresentationController presentationTransitionWillBegin  with the following message      Fatal Exception  NSGenericException   Your application has presented a UIAlertController   lt UIAlertController  0x17858a00   of style UIAlertControllerStyleActionSheet  The modalPresentationStyle of a UIAlertController with this style is UIModalPresentationPopover  You must provide location information for this popover through the alert controller s popoverPresentationController  You must provide either a sourceView and sourceRect or a barButtonItem  If this information is not known when you present the alert controller  you may provide it in the UIPopoverPresentationControllerDelegate method -prepareForPopoverPresentation

User · Answer

For me I just needed to add the following   if let popoverController   alertController popoverPresentationController       popoverController barButtonItem   navigationItem rightBarButtonItem

User · Answer

On iPad the alert will be displayed as a popover using the new UIPopoverPresentationController  it requires that you specify an anchor point for the presentation of the popover using either a sourceView and sourceRect or a barButtonItem   barButtonItem  sourceView sourceRect   In order to specify the anchor point you will need to obtain a reference to the UIAlertController s UIPopoverPresentationController and set one of the properties as follows   alertController popoverPresentationController barButtonItem   button    sample code   UIAlertAction  actionDelete   nil  UIAlertAction  actionCancel   nil      create action sheet UIAlertController  alertController    UIAlertController                                       alertControllerWithTitle actionTitle message nil                                       preferredStyle UIAlertControllerStyleActionSheet       Delete Button actionDelete    UIAlertAction                 actionWithTitle NSLocalizedString   IDS LABEL DELETE   nil                  style UIAlertActionStyleDestructive handler   UIAlertAction  action                            Delete                         self deleteFileAtCurrentIndexPath                           Cancel Button actionCancel    UIAlertAction                 actionWithTitle NSLocalizedString   IDS LABEL CANCEL   nil                  style UIAlertActionStyleCancel handler   UIAlertAction  action                           cancel                        Cancel code                         Add Cancel action  alertController addAction actionCancel    alertController addAction actionDelete       show action sheet alertController popoverPresentationController barButtonItem   button  alertController popoverPresentationController sourceView   self view    self presentViewController alertController animated YES                  completion nil

User · Answer

You can present a UIAlertController from a popover by using UIPopoverPresentationController  In Obj-C  UIViewController  self     code assumes you re in a view controller UIButton  button     the button you want to show the popup sheet from  UIAlertController  alertController  UIAlertAction  destroyAction  UIAlertAction  otherAction   alertController    UIAlertController alertControllerWithTitle nil                                                       message nil                            preferredStyle UIAlertControllerStyleActionSheet   destroyAction    UIAlertAction actionWithTitle   quot Remove All Data quot                                           style UIAlertActionStyleDestructive                                        handler   UIAlertAction  action                                                  do destructive stuff here                                            otherAction    UIAlertAction actionWithTitle   quot Blah quot                                         style UIAlertActionStyleDefault                                      handler   UIAlertAction  action                                                do something here                                             note  you can control the order buttons are shown  unlike UIActionSheet  alertController addAction destroyAction    alertController addAction otherAction    alertController setModalPresentationStyle UIModalPresentationPopover    UIPopoverPresentationController  popPresenter    alertController                                                popoverPresentationController   popPresenter sourceView   button  popPresenter sourceRect   button bounds   self presentViewController alertController animated YES completion nil    Editing for Swift 4 2  though there are many blogs available for the same but it may save your time to go and search for them  if let popoverController   yourAlert popoverPresentationController       popoverController sourceView   self view   to set the source of your alert     popoverController sourceRect   CGRect x  self view bounds midX  y  self view bounds midY  width  0  height  0     you can set this as per your requirement      popoverController permittedArrowDirections        to hide the arrow of any particular direction

User · Answer

Update for Swift 3 0 and higher      let actionSheetController  UIAlertController   UIAlertController title   SomeTitle   message  nil  preferredStyle   actionSheet       let editAction  UIAlertAction   UIAlertAction title   Edit Details   style   default    action - gt  Void in          print  Edit Details              let deleteAction  UIAlertAction   UIAlertAction title   Delete Item   style   default    action - gt  Void in          print  Delete Item              let cancelAction  UIAlertAction   UIAlertAction title   Cancel   style   cancel    action - gt  Void in        actionSheetController addAction editAction      actionSheetController addAction deleteAction      actionSheetController addAction cancelAction             present actionSheetController  animated  true  completion  nil       doesn t work for iPad      actionSheetController popoverPresentationController  sourceView   yourSourceViewName    works for both iPhone  amp  iPad      present actionSheetController  animated  true            print  option menu presented

User · Answer

2018 Update  I just had an app rejected for this reason and a very quick resolution was simply to change from using an action sheet to an alert   Worked a charm and passed the App Store testers just fine   May not be a suitable answer for everyone but I hope this helps some of you out of a pickle quickly

User · Answer

Here s a quick solution   NSString  text   self contentTextView text  NSArray  items     text    UIActivityViewController  activity     UIActivityViewController alloc                                        initWithActivityItems items                                       applicationActivities nil    activity excludedActivityTypes     UIActivityTypePostToWeibo    if    UIDevice currentDevice  userInterfaceIdiom     UIUserInterfaceIdiomPad          activity popoverPresentationController sourceView   shareButtonBarItem       activity popoverPresentationController barButtonItem   shareButtonBarItem        self presentViewController activity animated YES completion nil       self presentViewController activity animated YES completion nil

User · Answer

Swift 5  I used  actionsheet  style for iPhone and  alert  for iPad  iPad displays in the center of the screen  No need to specify sourceView or anchor the view anywhere   var alertStyle   UIAlertController Style actionSheet if  UIDevice current userInterfaceIdiom     pad      alertStyle   UIAlertController Style alert    let alertController   UIAlertController title   Your title   message  nil  preferredStyle  alertStyle    Edit  Per ShareToD s suggestion  updated deprecated  UI USER INTERFACE IDIOM      UIUserInterfaceIdiom pad  check

User · Answer

Swift 4 and above   I have created an extension   extension UIViewController     public func addActionSheetForiPad actionSheet  UIAlertController        if let popoverPresentationController   actionSheet popoverPresentationController         popoverPresentationController sourceView   self view       popoverPresentationController sourceRect   CGRect x  self view bounds midX  y  self view bounds midY  width  0  height  0        popoverPresentationController permittedArrowDirections                    How to use    let actionSheetVC   UIAlertController title   Title   message  nil  preferredStyle   actionSheet  addActionSheetForIpad actionSheet  actionSheetVC  present actionSheetVC  animated  true  completion  nil

User · Answer

It will work for both iphone and ipad func showImagePicker         var alertStyle   UIAlertController Style actionSheet     if  UIDevice current userInterfaceIdiom     pad          alertStyle   UIAlertController Style alert           let alert   UIAlertController title   quot  quot   message   quot Upload Attachment quot   preferredStyle  alertStyle      alert addAction UIAlertAction title   quot Choose from gallery quot   style   default   handler    UIAlertAction  in         self pickPhoto sourceType   photoLibrary              alert addAction UIAlertAction title   quot Take Photo quot   style   default  handler    UIAlertAction  in         self pickPhoto sourceType   camera              alert addAction UIAlertAction title   quot Cancel quot   style   cancel  handler    UIAlertAction  in             present alert  animated  true  completion  nil

User · Answer

Swift 4 2 You can use condition like that  let alert   UIAlertController title  nil  message  nil  preferredStyle  UIDevice current userInterfaceIdiom     pad    alert    actionSheet

User · Answer

Just add the following code before presenting your action sheet   if let popoverController   optionMenu popoverPresentationController       popoverController sourceView   self view     popoverController sourceRect   CGRect x  self view bounds midX  y  self view bounds midY  width  0  height  0      popoverController permittedArrowDirections

[ios] Presenting a UIAlertController properly on an iPad using iOS 8

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