use same UIAlertController in different ViewControllers - swift

Question

I have used side navigation menu(SWReveal). I have 4 ViewControllers. How can use same alertAction in different views.

Answer 1

You can create UIViewController extension like below:
extension UIViewController {
func showAlert(title: String?, message: String?, actionTitles:[String?], actions:[((UIAlertAction) -> 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)
}
}
And you can use this alert in UIViewController like below:
showAlert(title: "Your Title", message: "Your custom Message", actionTitles: ["Ok","Cancel"], actions: [{ action1 in
//OK Action
}, { action2 in
// Cancel Action
}
])
Hope will get your solution.

Answer 2

You can also use like this way.
class IOSPublicDefaultAlert: NSObject{
var viewController: UIViewController?
var actionCompletion: ((String) -> ())?
var alertTitle: String?
var alertMessage : String?
var alertType: UIAlertControllerStyle?
var actionTitleAndType: [String: UIAlertActionStyle]?
init(viewController : UIViewController,alertTitle: String?,alertMessage : String?,alertType: UIAlertControllerStyle = .alert,actionTitleAndType: [String: UIAlertActionStyle] ,actionCompletion : ((String)->())?){
super.init()
self.viewController = viewController
self.actionCompletion = actionCompletion
self.alertTitle = alertTitle
self.alertMessage = alertMessage
self.alertType = alertType
self.actionTitleAndType = actionTitleAndType
showAlert()
}
func showAlert(){
let alert = UIAlertController.init(title: alertTitle, message: alertMessage, preferredStyle: self.alertType ?? .alert)
for (actionTitle, actionType) in actionTitleAndType!{
let action = UIAlertAction(title: actionTitle, style: actionType) { (action) in
if let com = self.actionCompletion{
com(actionTitle)
}
}
alert.addAction(action)
}
viewController?.present(alert, animated: true, completion: nil)
}
}
and use add where you like as below sample
_ = IOSPublicDefaultAlert.init(viewController: self, alertTitle: "Warning!!!", alertMessage: alertMessage, actionTitleAndType: ["Ok" : .destructive, "Cancel" : .default], actionCompletion: { [unowned self] (title) in
if title == "Ok"{
}
})

Answer 3

In swift, your project, you can create a new .swift file and in this file create a class:
import UIKit
import Foundation
class yourFileName {
//Create a class function alerview
class func displayAlert(title: String, withMessage msg: String, andbtnTitle btntitle: String, in vc: UIViewController) {
let alert = UIAlertController(title: title, message: msg, preferredStyle: .alert)
alert.addAction(UIAlertAction(title: btntitle, style: UIAlertActionStyle.default, handler: nil))
appDelegate.window?.rootViewController?.present(alert, animated: true, completion: nil)
}
}
//and now your any ViewController.swift file or any other file in your project you can access alert following way.
class viewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
yourfilename.displayAlert(title: "Alert", withMessage msg: "my alert view display", andbtnTitle btntitle: "Ok", in vc: self) // access your alertview
}
}
I hope it's work for you.

Answer 4

Create BaseController with a method that can show alert.
//Copyright © 2017 dip. All rights reserved.
import UIKit
class BaseController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
///This is common method to show alert with same action
func showAlert() {
let alert = UIAlertController(title: "Alert", message: "my msg on alert", preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action) in
///This will be common alert ok aciton for all child controllers.
print("Do some userful common work..")
}))
self.present(alert, animated: true, completion: nil)
}
}
Inherit Your 4 controllers from BaseController
// Copyright © 2017 dip. All rights reserved.
//
import UIKit
class ChildVC: BaseController {
override func viewDidLoad() {
super.viewDidLoad()
//call show alert when ever you wish
///This method will call showAlert() method on super class (BaseController)
self.showAlert()
}
}
Call self.showAlert() method from child when you want show alert with common action.

Answer 5

// MARK: - Alertable View
protocol AlertableView {
// Use handler if need catch cancel alert action
typealias CompletionHandler = (() -> Void)
func displayAlert(with title: String, message: String, actions: [UIAlertAction]?)
func displayAlert(with title: String, message: String, style: UIAlertControllerStyle, actions: [UIAlertAction]?, completion: CompletionHandler?)
}
extension AlertableView where Self: UIViewController {
func displayAlert(with title: String, message: String, actions: [UIAlertAction]?) {
self.displayAlert(with: title, message: message, style: .alert, actions: actions, completion: nil)
}
func displayAlert(with title: String, message: String, style: UIAlertControllerStyle, actions: [UIAlertAction]?, completion: CompletionHandler?) {
let alertCancelAction = UIAlertAction(title: "Cancel".localized, style: .cancel) { (action) in
guard let completion = completion else { return }
completion()
}
let alertController = UIAlertController(title: title, message: message, preferredStyle: style)
if let actions = actions {
for action in actions {
alertController.addAction(action)
}
alertController.addAction(alertCancelAction)
} else {
// If not any custom actions, we add OK alert button
let alertOkAction = UIAlertAction(title: "OK".localized, style: .cancel) { (action) in
guard let completion = completion else { return }
completion()
}
alertController.addAction(alertOkAction)
}
self.present(alertController, animated: true, completion: nil)
}
}

Answer 6

Create a common function ,
import UIKit
class AlertClass: NSObject {
func showAlertWithVC(_ VC : UIViewController, andMessage message: String ){
DispatchQueue.main.async {
let alert = UIAlertController(title: "APPLICATION_NAME", message: message , preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.default, handler: nil))
VC.present(alert, animated: true, completion: nil)
}
}
}
Simply call AlertClass().showAlertWithVC() where you want to show Alert.