How to create a reusable UIAlert ActionSheet as an UIViewController extension? - swift

Question

I would like to create an action sheet that can be used several time in my code. To do so, I need to be able to use functions according to the action sheet title. Is there a way to pass functions as a parameter array like the "title" parameter?
//MARK: - UIAlert action sheet title
enum ActionSheetLabel: String {
case camera = "Camera"
case photoLibrary = "Album"
case cancel = "Cancel"
}
class CameraHandler {
static let cameraHandler = CameraHandler()
func openCamera() { }
func openPhotoLibrary() { }
}
//MARK: - Alert that shows an action sheet with cancel
extension UIViewController {
func showActionSheetWithCancel(vc: UIViewController, title: [ActionSheetLabel] /*Make a function parameter here to match title*/) {
let actionSheet = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
for value in title {
actionSheet.addAction(UIAlertAction(title: value.rawValue, style: .default, handler: {
(alert: UIAlertAction!) -> Void in
//Use the parameter function here to match title
}))
}
actionSheet.addAction(UIAlertAction(title: ActionSheetLabel.cancel.rawValue, style: .cancel, handler: nil))
vc.present(actionSheet, animated: true, completion: nil)
}
}

Answer 1

For UIAlert you just need to change preferredStyle .alert it and it's working for UIAlert And and below code just copy and paste it working for UIActionSheet.
extension UIViewController {
func popupAlert(title: String?, message: String?, actionTitles:[String?], actionStyle:[UIAlertAction.Style], actions:[((UIAlertAction) -> Void)?]) {
let alert = UIAlertController(title: title, message: message, preferredStyle: .actionSheet)
for (index, title) in actionTitles.enumerated() {
let action = UIAlertAction(title: title, style: actionStyle[index], handler: actions[index])
alert.addAction(action)
}
self.present(alert, animated: true, completion: nil)
}
}
Check below code For Usage
self.popupAlert(title: "Alert"), message: “Error in Loading”, actionTitles: ["Okey", "Email"], actionStyle: [.default, .default], actions: [nil,{ action in
// I have set nil for first button click
// do your code for second button click
}])
if you have any query then please comment me. Thank You

Answer 2

I have find out the best way to add an action sheet with cancel and as much action as needed.
Create an UIViewController extension with type alias:
//MARK: - Alert that shows an action sheet with cancel
extension UIViewController {
typealias AlertAction = () -> ()
typealias AlertButtonAction = (ActionSheetLabel, AlertAction)
func showActionSheetWithCancel(titleAndAction: [AlertButtonAction]) {
let actionSheet = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
for value in titleAndAction {
actionSheet.addAction(UIAlertAction(title: value.0.rawValue, style: .default, handler: {
(alert: UIAlertAction!) -> Void in
value.1()
}))
}
actionSheet.addAction(UIAlertAction(title: ActionSheetLabel.cancel.rawValue, style: .cancel, handler: nil))
self.present(actionSheet, animated: true, completion: nil)
}
}
Then, in the class or other place where you want to use it, add the method this way:
//MARK: - UIAlert action sheet title
enum ActionSheetLabel: String {
case camera = "Camera"
case photoLibrary = "Album"
case cancel = "Cancel"
}
//MARK: - Class example where to use the action sheet action
class CameraHandler {
fileprivate let currentVC: UIViewController!
func openCamera() {
// Open user camera
}
func openPhotoLibrary() {
// Open user photo library
}
// Method example of this action sheet
func showActionSheetWithCameraAndLibrary(vc: UIViewController) {
//This is the way to use the extension
vc.showActionSheetWithCancel(titleAndAction: [
(ActionSheetLabel.camera, { [weak self] in self?.openCamera() }),
(ActionSheetLabel.photoLibrary, { [weak self] in self?.openPhotoLibrary() })
])
}
}

Answer 3

You can pass a closure and call it in the handler something like this should work.
Also not sure why you were passing the UIViewController , as you're already defining the function in a extension UIViewController therefore i allowed my self to remove it and used self.present instead .
extension UIViewController {
func showActionSheetWithCancel(title: [ActionSheetLabel], action: #escaping () -> ()?) {
let actionSheet = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
for value in title {
actionSheet.addAction(UIAlertAction(title: value.rawValue, style: .default, handler: {
(alert: UIAlertAction!) -> Void in
// action
action()
}))
}
let alertAction = UIAlertAction(title: ActionSheetLabel.cancel.rawValue, style: .cancel) { (_) in
action() // or for cancel call it here
}
actionSheet.addAction(alertAction)
self.present(actionSheet, animated: true, completion: nil)
}
}
As you can see #escaping () -> ()? is optional so you can pass nil too .

Answer 4

from what I understood you need to call a specific functions when the title of the alert changes & also you want to be able to do so from different viewControllers,
I hope this will help
extension UIViewController {
func showActionSheetWithCancel(vc: UIViewController, title: [ActionSheetLabel] ) {
let actionSheet = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
let cameraHandler = CameraHandler()
for value in title {
switch value.rawValue {
case ActionSheetLabel.camera.rawValue:
actionSheet.addAction(UIAlertAction(title: ActionSheetLabel.camera.rawValue, style: .default, handler: { (alert) in
cameraHandler.openCamera()
}))
case ActionSheetLabel.photoLibrary.rawValue:
actionSheet.addAction(UIAlertAction(title: ActionSheetLabel.photoLibrary.rawValue, style: .default, handler: { (alert) in
cameraHandler.openPhotoLibrary()
}))
default:
actionSheet.addAction(UIAlertAction(title: ActionSheetLabel.cancel.rawValue, style: .cancel, handler: nil))
}
vc.present(actionSheet, animated: true, completion: nil)
}
}
}
and the call of the function will be like this:
showActionSheetWithCancel(vc: self, title: [UIViewController.ActionSheetLabel.camera])