wait after presentModalViewController

问题

I need to wait (don't execute the code) after the presentModalViewController until the modal view it's dismissed, it's possible or it's a conceptual error ?

-(NSDictionary *)authRequired
{
    //This view write the settings when dismissed (plist)
    [self presentModalViewController:loginRegView animated:YES]; 
    //Read from the setting file (plist) and send back (it's a delagate method)
    NSMutableDictionary *ret=[[NSMutableDictionary alloc] init];
    [ret setObject:[app.settings get:@"user"] forKey:@"user"];
    [ret setObject:[app.settings get:@"pass"] forKey:@"pass"];
    return ret;
}

回答1:

What you'll have to do is create a LoginRegViewControllerDelegate protocol to which the View Controller that presents the Modal View Controller adheres, and have your LoginRegViewController (or whatever its name is) send a message to its delegate that it just closed / is going to close. In this delegate method, your delegate View Controller should read the just-set settings and do whatever it wants with them.

回答2:

To make your child view controller (modal view) more flexible and reusable you can use NSNotificationCenter. Here's the class reference.

Your modal view should post a notification, that it is going to be closed. Any other controller, that should react on this notification should add an observer to the same notification center.

来源：https://stackoverflow.com/questions/2800055/wait-after-presentmodalviewcontroller