从其他类打开ViewController

Question

I want to be able to open a ViewController from a different class. So I could simply call it to open a view wherever I need it.

So I have this setup in the class that holds the code:

---

+ (void)openCalcView: (NSString *)nameOfView {

UIViewController *controller;

if ([nameOfView isEqualToString:@"Tax"]) {

    controller = [[TAXViewController alloc]initWithNibName:@"TAXViewController" bundle:nil];


}else if ([nameOfView isEqualToString:@"Rent"]){

    controller = [[RENTViewController alloc]initWithNibName:@"RENTViewController" bundle:nil];

}

controller.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentViewController:controller animated:YES completion:nil];
[controller release];

}

---

But [self presentViewController:controller animated:YES completion:nil]; gives me a warning:

Class method '+presentViewController:animated:completion:' not found (return type defaults to 'id')

I can call simple things like NSLog through this, from any class. But this doesn't work.

Answer 1

Because openCalcView is a Class method, there is no UIViewController instance (ie no [self presentViewController:] method).

You'll need to also pass a UIViewController to this class method, something like this:

+ (void)openCalcView: (NSString *)nameOfView fromViewController:(UIViewController *)controller { 

    UIViewController *newController; 

    if ([nameOfView isEqualToString:@"Tax"]) { 

        newController= [[TAXViewController alloc]initWithNibName:@"TAXViewController" bundle:nil]; 


    }else if ([nameOfView isEqualToString:@"Rent"]){ 

        newController= [[RENTViewController alloc]initWithNibName:@"RENTViewController" bundle:nil]; 

    } 

    newController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve; 
    [controller presentViewController:newController animated:YES completion:nil]; 
    [newController release]; 

} 

the controller parameter represents the UIViewController that is opening the new view controller