Clever Geek Handbook

Multiple UIAlertControllers in iOS

There are scripts in my application where multiple warnings can appear. But as in iOS8, UIAlertview turned to UIAlertController, I cannot show multiple warnings as you cannot present two or more controllers at the same time.

How can I achieve this using UIAlertController?

+3


source to share


7 replies


The following is a way to display multiple warnings:



        UIAlertController *av = [UIAlertController alertControllerWithTitle:title message:msg preferredStyle:UIAlertControllerStyleAlert];

        UIAlertAction *cancelAction = [UIAlertAction
                                       actionWithTitle:kAlertOk
                                       style:UIAlertActionStyleCancel
                                       handler:^(UIAlertAction *action)
                                       {

                                       }];
        [av addAction:cancelAction];

        UIWindow *alertWindow = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
        alertWindow.rootViewController = [[UIViewController alloc]init];
        alertWindow.windowLevel = UIWindowLevelAlert + 1;
        [alertWindow makeKeyAndVisible];
        [alertWindow.rootViewController presentViewController:av animated:YES completion:nil];
+8


source


You can keep track of the list of warnings displayed in the view controller as an instance variable like

NSMutableArray *alertsToShow;

You can imagine the first UIAlertController and add a UIAlertAction where you present the following warning (if applicable) with a recursive method:



- (void)showAlertIfNecessary {
    if (alertsToShow.count == 0)
        return;

    NSString *alert = alertsToShow[0];
    [alertsToShow removeObjectAtIndex:0];

    UIAlertController *alertController = [UIAlertController
                          alertControllerWithTitle:@"Title"
                          message:alert
                          preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *okAction = [UIAlertAction 
        actionWithTitle:@"OK"
                  style:UIAlertActionStyleDefault
                handler:^(UIAlertAction *action)
                {
                    [self showAlertIfNecessary];
                }];
    [alertController addAction:okAction];
    [self presentViewController:alertController animated:YES completion:nil];
}

Please note that this can become very annoying for the user if they have to click a lot of messages. You may want to consider combining them into one message.

+3


source


You can't show multiple alerts at the same time, and if you've done it before, you're misbehaving. Reimagine your interface.

You can easily present the warnings in turn, which is what you really need:

let alert = UIAlertController(title: "One", message: nil, preferredStyle: .Alert)
alert.addAction(UIAlertAction(title: "Next", style: .Default, handler: {
    _ in
    let alert2 = UIAlertController(title: "Two", message: nil, preferredStyle: .Alert)
    alert2.addAction(UIAlertAction(title: "OK", style: .Cancel, handler:nil))
    self.presentViewController(alert2, animated: true, completion: nil)
        }))
self.presentViewController(alert, animated: true, completion: nil)
+2


source


Swift version for @ Bejibun answer above:

    let alertView = UIAlertController(title: "New Message", message: "Message Body", preferredStyle: .Alert)

    alertView.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: { (UIAlertAction) in
       alertView.dismissViewControllerAnimated(true, completion: nil)
    }))

    let alertWindow = UIWindow(frame: UIScreen.mainScreen().bounds)
    alertWindow.rootViewController = UIViewController()
    alertWindow.windowLevel = UIWindowLevelAlert + 1
    alertWindow.makeKeyAndVisible()
    alertWindow.rootViewController?.presentViewController(alertView, animated: true, completion: nil)
+2


source


I think I am very late for this, but post anyway as it might be helpful for someone looking for this, although Apple does not recommend multiple notifications, so they dropped this UIAlertView from the UIAlertController implementation.

I created a subclass of AQAlertAction for UIAlertAction. You can use it for stunning warnings, the usage is the same as you use UIAlertAction. All you have to do is import the AQMutiAlertFramework into your project, or you can include the class as well (see the sample project for this). Internally, It uses a binary semaphore to daze Alerts until the user processes the action associated with the current alert being displayed. Let me know if this works for you.

0


source


You can use JSAlertView which handles UIAlertView and UIAlertController API.

It handles multiple warnings issued at the same time very well. It also provides very simple methods for displaying simple warnings.

0


source


You can find Top Most View Controller using this function.

func topViewController(_ base: UIViewController? = UIApplication.shared.keyWindow?.rootViewController) -> UIViewController? {
    if let nav = base as? UINavigationController {
        return topViewController(nav.visibleViewController)
    }
    if let tab = base as? UITabBarController {
        if let selected = tab.selectedViewController {
            return topViewController(selected)
        }
    }
    if let presented = base?.presentedViewController {
        return topViewController(presented)
    }
    return base
}

Present UIAlertController

Using this method via. as,

topViewController()?.present(alertController, animated: true, completion: nil)

Method Information: topViewController()

Find Top Most Presented View Controller, UIAlertController

Dinner Class UIViewController

.

first is UIAlertController

open normally in the top presented view controller, try opening the second UIAlertController

one and then topViewController()

given the first warning. therefore no missed UIAlertController

.

0


source






More articles:


All Articles