Init a ViewController with a value

I just created a new view controller for my iphone app.

The view controller is triggered when user tap down a button. The designated initializer for view controller is the default (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil.

I would an initializer like initWithID:(NSInteger)id but how to call the des开发者_如何学运维ignated initializer?

I don't like the portability provided by constructing a view controller using

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil;

So I often only use it internally anyway but it may look something like this

- (id)initWithId:(NSString *)identification
{
    self = [super initWithNibName:@"nibName" bundle:nil];
    if (self) {
        _identification = identification;
    }
    return self;
}

Note you shouldn't use id as a name as it is a type and therefore is confusing

If view controller A is constructing view controller B I like to think that if my code is loosely coupled enough then B should have a better idea than A as to what nib B should load.

Make a method in the .h file called:

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil ID:(NSInteger)idNumber;

And then in the .m file, implement the method as:

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil ID:(NSInteger)idNumber; {
  self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
  if(self != nil){
    // use the idNumber here!
  }
  return self;
}

Edit: I used id for the NSInteger as he used it in his question. I changed it to idNumber now, as people didn't seems to like it.

Hope that helps!

You can do it like so:

.h file

-(id)initWithID:(NSInteger)id;

.m file

-(id)initWithID:(NSInteger)id{

   self = [super initWithNibName:@"nib name" bundle:nil];
   if(self){
       //do what you want with the id
   }

   return self;
}

The standard way to do this is to use a property (at least that is how it is done in most of Apple's sample code).

In .h:

@interface MyViewController {
    NSInteger viewID;
}

@property (assign) NSInteger viewID;
@end

In .m:

@synthesize viewID;

In the View Controller that pushes it:

MyViewController *controller = [[MyViewController alloc] init];
controller.viewID = integerValue;
// and push the view controller

BTW, if the nib name is the same as the class name, just alloc-init will have the same effect.