How to add dynamic buttons on UIAlertController? - ios

Question

I'm converting my code from using UIActionSheet to use UIAlertController.
The way I do it using UIActionSheet is like this:
UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:#"Gender"
delegate:self
cancelButtonTitle:nil
destructiveButtonTitle:nil
otherButtonTitles:nil];
for (NSDictionary *genderInfo in self.genderList) {
NSString *gender = [[genderInfo objectForKey:#"description"] capitalizedString];
[actionSheet addButtonWithTitle:gender];
}
[actionSheet addButtonWithTitle:#"Cancel"];
And just handle what button is pressed on the delegate method of action sheet.
While converting it to alert controller, I noticed that there is a handler on each of the alert action. I wonder how will I implement the alert controller to have dynamic buttons that I can handle the actions.

Answer 1

Here i mention code for load array into UIAlertController dynamically with image & text :Output Image here
NSArray *numbersArrayList = #[#"One", #"Two", #"Three", #"Four", #"Five", #"Six"];
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:#"Numbers:"
message:nil
preferredStyle:UIAlertControllerStyleActionSheet];
for (int j =0 ; j<numbersArrayList.count; j++){
NSString *titleString = numbersArrayList[j];
UIAlertAction *action = [UIAlertAction actionWithTitle:titleString style:UIAlertActionStyleDefault handler:^(UIAlertAction *action){
NSLog(#"Selected Value: %#",numbersArrayList[j]);
}];
[action setValue:[[UIImage imageNamed:#"USA16.png"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal] forKey:#"image"];
[alertController addAction:action];
}
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:#"Cancel"
style:UIAlertActionStyleCancel
handler:^(UIAlertAction *action) {
}];
[alertController addAction:cancelAction];
[self presentViewController:alertController animated:YES completion:nil];

Answer 2

Got it!
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:#"Gender:"
message:nil
preferredStyle:UIAlertControllerStyleActionSheet];
for (NSDictionary *genderInfo in self.genderList) {
NSString *gender = [[genderInfo objectForKey:#"description"] capitalizedString];
UIAlertAction *action = [UIAlertAction actionWithTitle:gender
style:UIAlertActionStyleDefault
handler:^(UIAlertAction *action) {
NSString *title = action.title;
//you can check here on what button is pressed using title
}];
[alertController addAction:action];
}
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:#"Cancel"
style:UIAlertActionStyleCancel
handler:^(UIAlertAction *action) {
}];
[alertController addAction:cancelAction];
[self presentViewController:alertController animated:YES completion:nil];

Answer 3

In Swift:
import Foundation
import UIKit
class AlertUtility {
static let CancelButtonIndex = -1;
class func showAlert(_ onController:UIViewController, title:String?,message:String? ) {
showAlert(onController, title: title, message: message, cancelButton: "OK", buttons: nil, actions: nil)
}
/**
- parameter title: title for the alert
- parameter message: message for alert
- parameter cancelButton: title for cancel button
- parameter buttons: array of string for title for other buttons
- parameter actions: action is the callback which return the action and index of the button which was pressed
*/
class func showAlert(_ onController:UIViewController?, title:String?,message:String? = nil ,cancelButton:String = "OK",buttons:[String]? = nil,actions:((_ alertAction:UIAlertAction,_ index:Int)->())? = nil) {
// make sure it would be run on main queue
let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
let action = UIAlertAction(title: cancelButton, style: UIAlertAction.Style.cancel) { (action) in
alertController.dismiss(animated: true, completion: nil)
actions?(action,CancelButtonIndex)
}
alertController.addAction(action)
if let _buttons = buttons {
for button in _buttons {
let action = UIAlertAction(title: button, style: .default) { (action) in
let index = _buttons.index(of: action.title!)
actions?(action,index!)
}
alertController.addAction(action)
}
}
if let onController = onController{
onController.present(alertController, animated: true, completion: nil)
}else{
// let appdel = UIApplication.shared.delegate as! AppDelegate
// appdel.window!.rootViewController?.present(alertController, animated: true, completion: nil)
}
}
}
Use in your VC:
//MARK:- IB-ACTION(S)
#IBAction func actionShowAlertButtonTapped(_ sender: Any) {
AlertUtility.showAlert(self, title: "Are you sure you want to start this order ?", cancelButton: "Cancel", buttons: ["OK", "Button 1", "Button 2", "Button 3", "Button 4","Button 5"], actions: {(action, index) -> () in
if index != AlertUtility.CancelButtonIndex {
//Cancel Button Action Here..
}else{
//Other Button Actions as per Button Index..
}
})
}