Passing data from one viewcontroller to another

问题

I subclassed two view controllers.

The first one is supposed to pass data, a NSUrl object to the second one.

.m of the first one:

NSURL *temp = [NSURL URLWithString:@"http://example.com"];

UIViewController *presentationsFullScreen_ViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"PresentationsFullScreen_ViewController"];

presentationsFullScreen_ViewController.urlToUse = temp;

.h of the second one:

#import <UIKit/UIKit.h>

@interface PresentationsFullScreen_ViewController : UIViewController {


    NSURL *urlToUse;


}



@property (nonatomic,retain) NSURL *urlToUse;

It is obviously not working and not compiling,telling me essentially that I didn't subclass it and that the property urlToUse is not found on UIViewController.

How do I subclass correctly?

Thanks!

回答1:

It is correct code

 PresentationsFullScreen_ViewController *presentationsFullScreen_ViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"PresentationsFullScreen_ViewController"];
presentationsFullScreen_ViewController.urlToUse = temp;

回答2:

Solution:

don't forget to import the .h:

#import "PresentationsFullScreen_ViewController" 

and dont instantiate the object with UIViewController but rather with the name of the subclass:

PresentationsFullScreen_ViewController *presentationsFullScreen_ViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"PresentationsFullScreen_ViewController"];

来源：https://stackoverflow.com/questions/12867295/passing-data-from-one-viewcontroller-to-another