Calling methods between view controllers using Storyboard

问题

I've already read the post Passing data to views using Storyboards, but still have problem with calling methods:

Now I have AViewController and BViewController, both connected with Storyboard (no XIBs).

In BViewController :

-(void)doSth:(int)num;

So how can I call the doSth: method in AViewController?

The old way like [bViewController doSth:123]; don't work because I can't get the instance of BViewController in the Storyboard.

Thanks.

Peak

回答1:

I found if i use:

MapViewController *mapView = [self.storyboard instantiateViewControllerWithIdentifier:@"MapView"];

("MapView" is the identifier i set for that scene/view in storyboard)

and i just tested the old way and it works for me:

mapViewController *mapView = [[mapViewController alloc] initWithNibName:@"mapViewController" bundle:[NSBundle mainBundle]];

i can call methods in MapViewController directly, aka

[mapView testMethod];

回答2:

You need to implement the prepareForSegue:sender: method in your view controller. The first paramter is a UIStoryboardSegue object which has references to both the source and destination view controller. This should allow you to do your [bViewController doSth:123]; pretty much as before.

来源：https://stackoverflow.com/questions/6320587/calling-methods-between-view-controllers-using-storyboard