AppDelegate可以重定向？我收到错误委托而不是方法

Question

I'm looking for the app delegate to redirect back to the main story if that is possible but i kept on stumble upon error that app delegate method doesn't work.

AppDelegate.h

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate,UIAlertViewDelegate>

@property (strong, nonatomic) UIWindow *window;


@end

AppDelegate.m

- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification
{
    UIApplicationState state = [application applicationState];
    if (state == UIApplicationStateActive) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Daily Vibes"
                                                        message:notification.alertBody
                                                       delegate:self cancelButtonTitle:@"Okay"
                                                        otherButtonTitles:nil];
        [alert show];
    }
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
    {
        NSString *title = [alertView buttonTitleAtIndex:buttonIndex];

        if([title isEqualToString:@"Okay"])
        {
            UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
            UIViewController *mainViewController = [storyboard instantiateInitialViewController];
            self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
            self.window.rootViewController = mainViewController;
            [self.window makeKeyAndVisible];


        }
    }

I'm wondering is it possible to redirect them back to the main board when the click the UIAlertView

Answer 1

Just setting the root view controller on the existing window should do it. You don't need to create a new window, and you don't need to make it key and visible.

You can animate the transition by using UIView transition or CATransition if you want to get fancy.

This does seem like an unusual thing to attempt, though - you'll lose any state or unsaved data and it might be quite odd for your user.

Answer 2

if you want to present a view controller try something like the following:

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    NSString *title = [alertView buttonTitleAtIndex:buttonIndex];

    if([title isEqualToString:@"Okay"])
    {
        UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
        UIViewController *vc = [storyboard instantiateInitialViewController];
        [self.window.rootViewController presentViewController:vc animated:YES completion:nil]

    }
}