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I'm working on a project in objective C where i have to modificate some variables which are in a view controller from uiviews.

So i've tried somethings like this :

ViewController.h :

@property (nonatomic) bool Contact;

One of the UIViews :

ViewController * View;
View.Contact = YES;

I've also tried to make a setter method like this in the ViewController :

-(void) SetterContact:(bool)boolean;

And so to modificate from a UIView like this :

[View SetterContact:YES];

But it's looking working. I've read that i have to init the object in which is containt the variable, but in memory management it's not really good to make some initializations from object who are already actives no ? So if View is already init, i'm not going to call the init method from another UIView no ?

Thanks for your help !

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3 Answers 3

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If you want bool variable to be accessible from other viewController.Then simply wirte it as :-

@property BOOL Contact;

and make an object of ViewController in which you have declared contact variable as BOOL and access this variable using like this:-

OtherViewController *otherViewController=[[OtherViewController alloc] init];
otherViewController.Contact=YES;

As it is a instance variable it has to be accessed using class object.

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14 Comments

Returns an error : Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil' but i dont' have any NSarray in those two view controllers...
paste you viewController's code on pastebin so that I can see it deeply what you have done in your code
I just write : if (!World) { World = [[World_1_ViewController alloc] init]; } World.Contact = YES; Furthermore, that code looks like working in another viewcontroller -_-'
Ok, you need to check in currentViewController in which error displaying.If on other ViewController is working there is no issue in declaring bool varible.
I have checked, and all is the same as in my other view controller which is working. Really don't know how to fix it...
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use @property (nonatomic, assign, getter = isContact) BOOL contact; in your .h file.

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7 Comments

in my project i use NSSString instead @"YES"
so @property (nonatomic, retain) NSString isContact;
ViewController *view = [ViewController alloc] init]; view.isContact = @"YES";
you dont need to create your own get/setter and no need to init the NSString isContact nor synthesize.
How could i do a setter ? Easily
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  1. Respect naming conventions
    @property (nonatomic,retain) UIViewController *myController;

don't forget to synthesize
@synthesize myController = _myController;

  1. If you want to implement your own setter do this: respect the naming convention
    -(void)setMyController:(UIViewController*)controller;

  2. or if by any bizarre reason you can't respect naming convention you can point the property to the method you want
    @property (nonatomic,retain,setter=myBizarreSetterMethod:) UIViewController *myController;

this can help you out as well question in stackoverflow

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