How would I create a UIAlertView in Swift

Question

I have been working to create a UIAlertView in Swift  but for some reason I can t get the statement right because I m getting this error       Could not find an overload for  init  that accepts the supplied   arguments   Here is how I have it written   let button2Alert  UIAlertView   UIAlertView title   Title   message   message                        delegate  self  cancelButtonTitle   OK   otherButtonTitles  nil    Then to call it I m using   button2Alert show     As of right now it is crashing and I just can t seem to get the syntax right

User · Answer

I have another trick  Suppose you have 5 classes where a logout alert to be applied  Try with swift class extension   File- New- Swift class- Name it   Add the following       public extension UIViewController        func makeLogOutAlert                 var refreshAlert   UIAlertController title   Log Out   message   Are You Sure to Log Out      preferredStyle  UIAlertControllerStyle Alert           refreshAlert addAction UIAlertAction title   Confirm   style   Default  handler     action  UIAlertAction   in             self navigationController  popToRootViewControllerAnimated true                       refreshAlert addAction UIAlertAction title   Cancel   style   Default  handler     action  UIAlertAction   in             refreshAlert  dismissViewControllerAnimated true  completion  nil                       presentViewController refreshAlert  animated  true  completion  nil            Implement using    self makeLogOutAlert    Hope it helps

User · Answer

Here is a funny example in Swift   private func presentRandomJoke       if let randomJoke  String   jokesController randomJoke         let alertController  UIAlertController   UIAlertController title nil  message randomJoke  preferredStyle  UIAlertControllerStyle Alert      alertController addAction UIAlertAction title  Done   style UIAlertActionStyle Default  handler nil       presentViewController alertController  animated true  completion nil

User · Answer

From the UIAlertView class         UIAlertView is deprecated  Use UIAlertController with a   preferredStyle of UIAlertControllerStyleAlert instead   On iOS 8  you can do this   let alert   UIAlertController title   Alert   message   Message   preferredStyle  UIAlertControllerStyle Alert  alert addAction UIAlertAction title   Click   style  UIAlertActionStyle Default  handler  nil   self presentViewController alert  animated  true  completion  nil    Now UIAlertController is a single class for creating and interacting with what we knew as UIAlertViews and UIActionSheets on iOS 8   Edit  To handle actions   alert addAction UIAlertAction title   OK   style   Default  handler    action in     switch action style      case  Default          print  default        case  Cancel          print  cancel        case  Destructive          print  destructive                Edit for Swift 3   let alert   UIAlertController title   Alert   message   Message   preferredStyle  UIAlertControllerStyle alert  alert addAction UIAlertAction title   Click   style  UIAlertActionStyle default  handler  nil   self present alert  animated  true  completion  nil    Edit for Swift 4 x   let alert   UIAlertController title   Alert   message   Message   preferredStyle   alert  alert addAction UIAlertAction title   OK   style   default  handler    action in       switch action style        case  default              print  default          case  cancel              print  cancel          case  destructive              print  destructive          self present alert  animated  true  completion  nil

User · Answer

I found this one   var alertView   UIAlertView    alertView addButtonWithTitle  Ok    alertView title    title   alertView message    message   alertView show      not good though  but it works     Update   but I have found on header file as   extension UIAlertView       convenience init title  String  message  String  delegate  UIAlertViewDelegate   cancelButtonTitle  String   otherButtonTitles firstButtonTitle  String    moreButtonTitles  String         somebody may can explain this

User · Answer

One Button    class ViewController  UIViewController         IBAction func showAlertButtonTapped   sender  UIButton                create the alert         let alert   UIAlertController title   My Title   message   This is my message    preferredStyle  UIAlertController Style alert              add an action  button          alert addAction UIAlertAction title   OK   style  UIAlertAction Style default  handler  nil               show the alert         self present alert  animated  true  completion  nil            Two Buttons    class ViewController  UIViewController         IBAction func showAlertButtonTapped   sender  UIButton                create the alert         let alert   UIAlertController title   UIAlertController   message   Would you like to continue learning how to use iOS alerts    preferredStyle  UIAlertController Style alert              add the actions  buttons          alert addAction UIAlertAction title   Continue   style  UIAlertAction Style default  handler  nil           alert addAction UIAlertAction title   Cancel   style  UIAlertAction Style cancel  handler  nil               show the alert         self present alert  animated  true  completion  nil            Three Buttons    class ViewController  UIViewController         IBAction func showAlertButtonTapped   sender  UIButton                create the alert         let alert   UIAlertController title   Notice   message   Lauching this missile will destroy the entire universe  Is this what you intended to do    preferredStyle  UIAlertController Style alert              add the actions  buttons          alert addAction UIAlertAction title   Remind Me Tomorrow   style  UIAlertAction Style default  handler  nil           alert addAction UIAlertAction title   Cancel   style  UIAlertAction Style cancel  handler  nil           alert addAction UIAlertAction title   Launch the Missile   style  UIAlertAction Style destructive  handler  nil               show the alert         self present alert  animated  true  completion  nil            Handling Button Taps  The handler was nil in the above examples  You can replace nil with a closure to do something when the user taps a button  For example   alert addAction UIAlertAction title   Launch the Missile   style  UIAlertAction Style destructive  handler    action in         do something like        self launchMissile          Notes   Multiple buttons do not necessarily need to use different UIAlertAction Style types  They could all be  default  For more than three buttons consider using an Action Sheet  The setup is very similar  Here is an example

User · Answer

Use this code to display an alertview     let alertController   UIAlertController title   Hello  Coders   message   your alert message   preferredStyle   Alert          let defaultAction   UIAlertAction title   Close Alert   style   Default  handler  nil          alertController addAction defaultAction           presentViewController alertController  animated  true  completion  nil    Reference  Swift Show Alert using UIAlertController

User · Answer

For iOS 13 Xcode 11  Swift 5 X  UIAlertController can now provide Alerts as well as Action Sheets  Alerts     First instantiate the UIAlertController  let alert   UIAlertController title   Title                                 message   Message                                   preferredStyle   alert        Add action buttons to it and attach handler functions if you want to    alert addAction UIAlertAction title   Cancel   style   cancel  handler  nil    alert addAction UIAlertAction title   Just Do It    style   destructive  handler  nil    alert addAction UIAlertAction title   Maybe   style   default  handler  nil       Show the alert by presenting it  self present alert  animated  true    Note that it s is a fundamental nature for all action buttons to dismiss the alert view when tapped  The style parameter is just for deciding the color of the text  and some default order in which the buttons should appear which ofc can be changed   A sample handler function could be   func handler   action  UIAlertAction         if action title     Title              do stuff           As a side note  I would say instead of making 3 different handlers you can just make 1 and trace back to the element which provoked it in the manner shown above We can also check alert style but that again we can have multiple  default styled actions   I wouldn t recommend that  Action Sheets  The explanation is similar because the main difference here is that an alert interrupts the user whereas an action sheet slides from the bottom in an iPhone and appears as a popover in an iPad  The Purpose of action sheets is to guide the users in deciding his actions based on their current state  So you gotta treat action sheets like crossroads    There is generally no message and the title is rendered as caption sized text  let action   UIAlertController title   What do you want to do with the message                                  message  nil                                 preferredStyle   actionSheet   action addAction UIAlertAction title   Cancel   style   cancel     for act in   Save    Post    Discard                 action addAction UIAlertAction title  act  style   default  handler  nil      self present action  animated  true    The above code is going to work for an iPhone but will crash at runtime for an iPad because UIPopoverPresentationController is going to take charge of the alert and it won t be referencing anything at that time  So to avoid that you will have to provide the following chunk of code its mandatory  if let pop   action popoverPresentationController         let v   sender as  UIView       pop sourceView   v       pop sourceRect   v bounds      Also in case of iPad tapping on anywhere outside the popover will dismiss it and the completion handler of  cancel action button will be called    Hope that helps    That being said  comment down below if you have any doubts

User · Answer

I have made a singleton class to make this convenient to use from anywhere in your app  https   github com Swinny1989 Swift-Popups  You can then create a popup with multiple buttons like this   Popups SharedInstance ShowAlert self  title   Title goes here   message   Messages goes here   buttons    button one     button two       buttonPressed  - gt  Void in     if buttonPressed     button one             Code here       else if buttonPressed     button two               Code here           or popups with a single button like this   Popups SharedInstance ShowPopup  Title goes here   message   Message goes here

User · Answer

Swift 3  The following is a simple example of how to create a simple alert with one button with Swift 3   let alert   UIAlertController title   Title                                 message   Message                                 preferredStyle   alert  alert addAction UIAlertAction title   Ok   style   default   present alert  animated  true    In the above example the handle callback of the action has been omitted because the default behaviour of an alert view with one button is to disappear when the button is clicked   Here is how to create another action  which could be added to the alert with  alert addAction action    The different styles are  default   destructive and  cancel   let action   UIAlertAction title   Ok   style   default    action in        Handle when button is clicked

User · Answer

IBAction func Alert sender  UIButton         var alertView UIAlertView   UIAlertView       alertView title    Alert       alertView message    Message      alertView delegate   self     alertView addButtonWithTitle  OK        alertView show        Try this

User · Answer

If you re targeting iOS 7 and 8  you need something like this to make sure you re using the right method for each version  because UIAlertView is deprecated in iOS 8  but UIAlertController is not available in iOS 7   func alert title  String  message  String        if let getModernAlert  AnyClass   NSClassFromString  UIAlertController        iOS 8         let myAlert  UIAlertController   UIAlertController title  title  message  message  preferredStyle   Alert          myAlert addAction UIAlertAction title   OK   style   Default  handler  nil           self presentViewController myAlert  animated  true  completion  nil        else      iOS 7         let alert  UIAlertView   UIAlertView           alert delegate   self          alert title   title         alert message   message         alert addButtonWithTitle  OK            alert show

User · Answer

UIAlertView is deprecated  Use UIAlertController       title   title of the alert view       message   Alert message you want to show       By tap on  OK    Alert view will dismiss    UIAlertView title   Alert   message   Enter Message here    delegate  nil  cancelButtonTitle   OK   show

User · Answer

in xcode 9  let alert   UIAlertController title   Alert   message   message   preferredStyle  UIAlertControllerStyle alert  alert addAction UIAlertAction title   Ok   style  UIAlertActionStyle default  handler  nil   self present alert  animated  true  completion  nil

User · Answer

on IOS 9  you can do this   let alert   UIAlertController title   Alert   message   Message   preferredStyle  UIAlertControllerStyle alert  alert addAction UIAlertAction title   Click   style  UIAlertActionStyle default  handler  nil   self present alert  animated  true  completion  nil

User · Answer

Or just do this         let alert   UIAlertController title   quot Alert quot   message   quot Saved Successfully quot   preferredStyle  UIAlertController Style alert          alert addAction UIAlertAction title   quot Ok quot   style  UIAlertAction Style default  handler  nil           self present alert  animated  true  completion  nil

User · Answer

try This  Put Bellow Code In Button   let alert   UIAlertController title   Your Title Text   message   Your MSG   preferredStyle  UIAlertControllerStyle alert  alert addAction UIAlertAction title   Your Text   style  UIAlertActionStyle default  handler  nil   self present alert  animated true  completion  nil

User · Answer

You can use this simple extension with n number of buttons and associated actions swift4 and above  extension UIViewController       func popupAlert title  String   message  String   actionTitles  String    actions    UIAlertAction  - gt  Void               let alert   UIAlertController title  title  message  message  preferredStyle   alert          for  index  title  in actionTitles enumerated                 let action   UIAlertAction title  title  style   default  handler  actions index               alert addAction action                    self present alert  animated  true  completion  nil            you can use it like    self popupAlert title   Message   message   your message   actionTitles    first   second   third    actions                action1 in                   action for first btn click                             action2 in                   action for second btn click                             action3 in                   action for third btn click                nil

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SwiftUI on Swift 5 x and Xcode 11 x  import SwiftUI  struct ContentView  View         State private var isShowingAlert   false      var body  some View           VStack               Button  A Button                      self isShowingAlert toggle                              alert isPresented   isShowingAlert       - gt  Alert in                 Alert                      title  Text  Alert                        message  Text  This is an alert                        dismissButton                           default                              Text  OK                                action                                    print  Dismissing alert                                                                                                               padding            struct ContentView Previews  PreviewProvider       static var previews  some View           ContentView

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I got the following UIAlertView initialization code to compile without errors  I thing the last  varyadic part is tricky perhaps   But I had to make sure the class of self  which I am passing as the delegate  was adopting the UIAlertViewDelegate protocol for the compile errors to go away   let alertView   UIAlertView                    title   My Title                     message   My Message                     delegate  self                    cancelButtonTitle   Cancel                     otherButtonTitles   OK                      By the way  this is the error I was getting  as of Xcode 6 4       Cannot find an initializer for type  UIAlertView  that accepts an   argument list of type   title  String  message  String  delegate    MyViewController  cancelButtonTitle  String  otherButtonTitles    String     As others mentioned  you should migrate to UIAlertController if you can target iOS 8 x   To support iOS 7  use the code above  iOS 6 is not supported by Swift

User · Answer

let alertController   UIAlertController title   Select Photo   message   Select atleast one photo   preferredStyle   alert      let action1   UIAlertAction title   From Photo   style   default     action  in         print  Default is pressed                  let action2   UIAlertAction title   Cancel   style   cancel     action  in         print  Cancel is pressed                   let action3   UIAlertAction title   Click new   style   default     action  in         print  Destructive is pressed                  alertController addAction action1      alertController addAction action2      alertController addAction action3      self present alertController  animated  true  completion  nil

User · Answer

In Swift 4 2 and Xcode 10 Method 1   SIMPLE ALERT let alert   UIAlertController title   quot Your title quot   message   quot Your message quot   preferredStyle   alert            let ok   UIAlertAction title   quot OK quot   style   default  handler    action in              alert addAction ok       let cancel   UIAlertAction title   quot Cancel quot   style   default  handler    action in              alert addAction cancel       DispatchQueue main async execute            self present alert  animated  true      Method 2   ALERT WITH SHARED CLASS If you want Shared class style Write once use every where  import UIKit class SharedClass  NSObject    This is shared class static let sharedInstance   SharedClass          Show alert     func alert view  UIViewController  title  String  message  String            let alert   UIAlertController title  title  message  message  preferredStyle   alert          let defaultAction   UIAlertAction title   quot OK quot   style   default  handler    action in                    alert addAction defaultAction          DispatchQueue main async execute                view present alert  animated  true                        private override init              Now call alert like this in every ware SharedClass sharedInstance alert view  self  title   quot Your title here quot   message   quot Your message here quot    Method 3   PRESENT ALERT TOP OF ALL WINDOWS If you want to present alert on top of all views  use this code func alertWindow title  String  message  String        DispatchQueue main async execute            let alertWindow   UIWindow frame  UIScreen main bounds          alertWindow rootViewController   UIViewController           alertWindow windowLevel   UIWindowLevelAlert   1              let alert2   UIAlertController title  title  message  message  preferredStyle   alert          let defaultAction2   UIAlertAction title   quot OK quot   style   default  handler    action in                    alert2 addAction defaultAction2               alertWindow makeKeyAndVisible                alertWindow rootViewController  present alert2  animated  true  completion  nil            Function calling SharedClass sharedInstance alertWindow title  quot This your title quot   message  quot This is your message quot    Method 4   Alert with Extension extension  UIViewController        func showAlert withTitle title  String  withMessage message String            let alert   UIAlertController title  title  message  message  preferredStyle   alert          let ok   UIAlertAction title   quot OK quot   style   default  handler    action in                    let cancel   UIAlertAction title   quot Cancel quot   style   default  handler    action in                    alert addAction ok          alert addAction cancel          DispatchQueue main async execute                self present alert  animated  true                      Now call like this   Call showAlert function in your class  IBAction func onClickAlert   sender  UIButton        showAlert withTitle  quot Your Title Here quot   withMessage   quot YourCustomMessageHere quot      Method 5   ALERT WITH TEXTFIELDS If you want to add textfields to alert    Global variables var name String  var login String     Call this function like this   alertWithTF      Add textfields to alert  func alertWithTF              let alert   UIAlertController title   quot Login quot   message   quot Enter username amp password quot   preferredStyle   alert         Login button     let loginAction   UIAlertAction title   quot Login quot   style   default  handler     action  - gt  Void in            Get TextFields text         let usernameTxt   alert textFields  0          let passwordTxt   alert textFields  1            Asign textfileds text to our global varibles         self name   usernameTxt text         self login   passwordTxt text                  print  quot USERNAME    self name   nPASSWORD    self login   quot                      Cancel button     let cancel   UIAlertAction title   quot Cancel quot   style   destructive  handler     action  - gt  Void in               1 textField for username     alert addTextField    textField  UITextField  in         textField placeholder    quot Enter username quot            If required mention keyboard type  delegates  text sixe and font etc              EX          textField keyboardType    default                  2nd textField for password     alert addTextField    textField  UITextField  in         textField placeholder    quot Enter password quot          textField isSecureTextEntry   true                   Add actions     alert addAction loginAction      alert addAction cancel      self present alert  animated  true  completion  nil          Method 6  Alert in SharedClass with Extension   This is your shared class import UIKit   class SharedClass  NSObject     static let sharedInstance   SharedClass       Here write your code       private override init             Alert function in shared class extension UIViewController       func showAlert title  String  msg  String            DispatchQueue main async               let alert   UIAlertController title  title  message  msg  preferredStyle   alert              alert addAction UIAlertAction title   quot OK quot   style   default  handler  nil               self present alert  animated  true  completion  nil                     Now call directly like this self showAlert title   quot Your title here    quot   msg   quot Your message here    quot    Method 7  Alert with out shared class with Extension in separate class for alert  Create one new Swift class  and import UIKit  Copy and paste below code    This is your Swift new class file import UIKit import Foundation  extension UIAlertController       class func alert title String  msg String  target  UIViewController            let alert   UIAlertController title  title  message  msg  preferredStyle  UIAlertControllerStyle alert          alert addAction UIAlertAction title   quot Ok quot   style  UIAlertActionStyle default             result  UIAlertAction  - gt  Void in                    target present alert  animated  true  completion  nil           Now call alert function like this in all your classes  Single line   UIAlertController alert title  quot Title quot   msg  quot Message quot   target  self   How is it

User · Answer

SWIFT 4   Simply create a extension to UIViewController as follows   extension  UIViewController               func showSuccessAlert withTitle title  String  andMessage message String            let alert   UIAlertController title  title  message  message                                    preferredStyle  UIAlertController Style alert          alert addAction UIAlertAction title   OK  localized  style          UIAlertAction Style default  handler  nil           self present alert  animated  true  completion  nil            Now in your ViewController  directly call above function as if they are provided by UIViewController       yourViewController showSuccessAlert withTitle          YourTitle   andMessage   YourCustomTitle

User · Answer

The Old Way  UIAlertView  let alertView   UIAlertView title   Default Style   message   A standard alert    delegate  self  cancelButtonTitle   Cancel   otherButtonTitles   OK   alertView alertViewStyle    Default alertView show       MARK  UIAlertViewDelegate   func alertView alertView  UIAlertView  clickedButtonAtIndex buttonIndex  Int     switch buttonIndex                          The New Way  UIAlertController  let alertController   UIAlertController title   Default Style   message   A standard alert    preferredStyle   Alert   let cancelAction   UIAlertAction title   Cancel   style   Cancel     action  in            alertController addAction cancelAction    let OKAction   UIAlertAction title   OK   style   Default     action  in            alertController addAction OKAction   self presentViewController alertController  animated  true

User · Answer

Here is a pretty simple function of AlertView in Swift    class func globalAlertYesNo msg  String            let alertView   UNAlertView title   Title   message  msg           alertView messageAlignment   NSTextAlignment Center         alertView buttonAlignment    UNButtonAlignment Horizontal          alertView addButton  Yes   action                 print  Yes action                        alertView addButton  No   action                 print  No action                        alertView show            You have to pass message as a String where you use this function

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Custom Class For UIAlertView    MARK - MODULES import Foundation import UIKit    MARK - CLASS class Alert    NSObject   static let shared   Alert    var okAction   AlertSuccess  typealias AlertSuccess      - gt      var alert  UIAlertController       show    public func show title   String   message   String   viewController   UIViewController   okAction   AlertSuccess   nil         let version   NSString   UIDevice current systemVersion as NSString     if  version doubleValue  gt   8           alert   UIAlertController title  title  message  message  preferredStyle  alert          alert  addAction UIAlertAction title   OK   style   default  handler     action  UIAlertAction  in              if let okAction   okAction                   okAction                                     viewController  present alert    UIAlertController    animated true  completion nil                showWithCancelAndOk    public func showWithCancelAndOk title   String  okTitle   String  cancelTitle   String  message   String  viewController   UIViewController   okAction   AlertSuccess   nil  cancelAction   AlertSuccess   nil        let version NSString   UIDevice current systemVersion as NSString       if  version doubleValue  gt   8           alert   UIAlertController title  title  message  message  preferredStyle  alert           alert  addAction UIAlertAction title  cancelTitle  style   default  handler     action  UIAlertAction  in              if let cancelAction   cancelAction                   cancelAction                                     alert  addAction UIAlertAction title  okTitle  style   default  handler     action  UIAlertAction  in              if let okAction   okAction                   okAction                                     viewController  present alert   animated true  completion nil                showWithTimer    public func showWithTimer message   String   viewController   UIViewController          let version   NSString   UIDevice current systemVersion as NSString     if  version doubleValue  gt   8           alert   UIAlertController title      message  message  preferredStyle  alert          viewController  present alert    UIAlertController    animated true  completion nil          let when   DispatchTime now     1         DispatchQueue main asyncAfter deadline  when               self alert  dismiss animated  true  completion  nil                        Use -   Alert shared show title   No Internet Connection   message   The internet connection appers to be offline    viewController  self    without ok action  Alert shared show title   No Internet Connection   message   The internet connection appers to be offline    viewController  self  okAction                                  ok action                               with ok action  Alert shared show title   No Internet Connection   message   The internet connection appers to be offline    viewController  self  okAction                                  ok action     cancelAction       cancel action      with cancel and ok action  Alert shared showWithTimer message    This is an alert with timer   viewController   self    with timer

User · Answer

Click of View        IBAction func testClick sender  UIButton       var uiAlert   UIAlertController title   Title   message   Message   preferredStyle  UIAlertControllerStyle Alert    self presentViewController uiAlert  animated  true  completion  nil     uiAlert addAction UIAlertAction title   Ok   style   Default  handler    action in    println  Click of default button            uiAlert addAction UIAlertAction title   Cancel   style   Cancel  handler    action in    println  Click of cancel button              Done with two buttons OK  amp  Cancel

User · Answer

For SWIFT4  I think  extending UIViewController and creating a reusable confirmation control is the most elegant way    You can extend the UIViewController as below   extension UIViewController    func AskConfirmation  title String  message String  completion  escaping    result Bool  - gt  Void        let alert   UIAlertController title  title  message  message  preferredStyle  UIAlertControllerStyle alert      self present alert  animated  true  completion  nil       alert addAction UIAlertAction title   Ok   style   default  handler    action in         completion true               alert addAction UIAlertAction title   Cancel   style   cancel  handler    action in         completion false                  Then you can use it anytime    AskConfirmation title   YOUR MESSAGE TITLE   message   YOUR MESSAGE      result  in         if result     User has clicked on Ok            else     User has clicked on Cancel

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With the protocol extensions of Swift 2  you can make a protocol that provides a default implementation to your view controllers   ShowsAlert swift  import UIKit  protocol ShowsAlert     extension ShowsAlert where Self  UIViewController       func showAlert title  String    Error   message  String            let alertController   UIAlertController title  title  message  message  preferredStyle   Alert          alertController addAction UIAlertAction title   Ok   style   Default  handler  nil           presentViewController alertController  animated  true  completion  nil            ViewController swift  class ViewController  UIViewController  ShowsAlert       override func viewDidLoad             super viewDidLoad           showAlert message   Hey there  I am an error message

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class Preview  UIViewController   UIAlertViewDelegate                IBAction func MoreBtnClicked sender  AnyObject                        var moreAlert UIAlertView title   Photo   message      delegate  self  cancelButtonTitle   No Thanks    otherButtonTitles   Save Image    Email    Facebook    Whatsapp                moreAlert show               moreAlert tag 111                     func alertView alertView  UIAlertView  didDismissWithButtonIndex buttonIndex  Int                        if alertView tag  111                               if buttonIndex  0                                       println  No Thanks                                      else if buttonIndex  1                                       println  Save Image                                     else if buttonIndex    2                                       println  Email                                     else if buttonIndex    3                                       println  Facebook                                     else if buttonIndex    4                                       println  Whatsapp

User · Answer

AlertView Swift 5 and above - let alert   UIAlertController title  LocalizedStringConstant alert  message  message  preferredStyle  UIAlertController Style alert  alert addAction UIAlertAction title   quot Retry quot   style   cancel  handler        in     self present alert  animated  true  completion  nil

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Show UIAlertView in swift language  -  Protocol UIAlertViewDelegate  let alert   UIAlertView title   alertView   message   This is alertView   delegate self  cancelButtonTitle  Cancel   otherButtonTitles   Done    Delete   alert show     Show UIAlertViewController in swift language  -  let alert   UIAlertController title   Error   message   Enter data in Text fields   preferredStyle  UIAlertControllerStyle Alert  alert addAction UIAlertAction title   OK   style  UIAlertActionStyle Default  handler  nil   self presentViewController alert  animated  true  completion  nil

User · Answer

The reason it doesn t work because some value you passed to the function isn t correct  swift doesn t like Objective-C  you can put nil to arguments which are class type without any restriction might be   Argument otherButtonTitles is defined as non-optional which its type do not have    at its end  so you must pass a concrete value to it

User · Answer

You can create a UIAlert using the standard constructor  but the  legacy  one seems to not work   let alert   UIAlertView   alert title    Alert  alert message    Here s a message  alert addButtonWithTitle  Understood   alert show

User · Answer

Below is the reusable code for alert view and action sheet  Just write one line to show alert anywhere in application   class AlertView       static func show title String    nil message String  preferredStyle  UIAlertControllerStyle    alert buttons  String      Ok   completionHandler  escaping  String - gt Void           let alert   UIAlertController title  title  message  message  preferredStyle  preferredStyle           for button in buttons               var style   UIAlertActionStyle default             let buttonText   button lowercased   replacingOccurrences of       with                  if buttonText     cancel                   style    cancel                           let action   UIAlertAction title  button  style  style        in                 completionHandler button                            alert addAction action                     DispatchQueue main async               if let app   UIApplication shared delegate as  AppDelegate  let rootViewController   app window  rootViewController                   rootViewController present alert  animated  true  completion  nil                                     Usage     class ViewController  UIViewController        override func viewWillAppear   animated  Bool            AlertView show title   Alert   message   Are you sure     preferredStyle   alert  buttons    Yes   No       button  in             print button

User · Answer

Simply do not provide otherButtonTitles in the constructor   let alertView   UIAlertView title   Oops    message   Something happened      delegate  nil  cancelButtonTitle   OK    alertView show     But I do agree with Oscar  this class is deprecated in iOS 8  so there won t be no use of UIAlertView if you re doing an iOS 8 only app  Otherwise the code above will work

[ios] How would I create a UIAlertView in Swift?

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