How to create uialertcontroller in global swift

Question

I'm trying to create uialertcontroller in Config.swift file as follow.

static func showAlertMessage(titleStr:String, messageStr:String) -> Void {
    let window : UIWindow?
    let alert = UIAlertController(title: titleStr, message: messageStr, preferredStyle: UIAlertControllerStyle.Alert);
    self.window!.presentViewController(alert, animated: true, completion: nil)
}

problem is I've found problem in self.window!.

Type 'Config' has no member 'window'

Please let me know how to solve that issue.

Answer 1

swift

Here's what I used, this is the same as @penatheboss answered, just add the ability of adding actions and handlers.

extension UIViewController {
    func popupAlert(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)
    }
}

Just make sure actionTitles and actions array the same count. Pass nil if you don't need any action handler closure.

self.popupAlert(title: "Title", message: " Oops, xxxx ", actionTitles: ["Option1","Option2","Option3"], actions:[{action1 in

},{action2 in

}, nil])

Objective C:

Add the category for UIViewController

UIViewController+PopAlert.h

#import <UIKit/UIKit.h>

@interface UIViewController (UIViewControllerCategory)
- (void) popAlertWithTitle: (NSString*) title message: (NSString*) message actionTitles:(NSArray *) actionTitles actions:(NSArray*)actions;
@end

UIViewController+PopAlert.m

#import "UIViewController+PopAlert.h"

@implementation UIViewController (UIViewControllerCategory)
- (void) popAlertWithTitle: (NSString*) title message: (NSString*) message actionTitles:(NSArray *) actionTitles actions:(NSArray*)actions {
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:title message:message preferredStyle:UIAlertControllerStyleAlert];
    [actionTitles enumerateObjectsUsingBlock:^(id  _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {
        UIAlertAction *action = [UIAlertAction actionWithTitle:obj style:UIAlertActionStyleDefault handler:actions[idx]];
        [alert addAction:action];
    }];
    [self presentViewController:alert animated:YES completion:nil];
}
@end

Usage:

#import UIViewController+PopAlert.h

...

[super viewDidDisappear:animated];
    NSArray *actions = @[^(){NSLog(@"I am action1");}, ^(){NSLog(@"I am action2");}];
    [self popAlertWithTitle:@"I am title" message:@"good" actionTitles:@[@"good1", @"good2"] actions:actions];