CODEWITHSUNDEEP
iosiphoneobjective-cinheritanceparse-platform
Ríomhaire
Ríomhaire

Reputation: 3124

How to set readonly properties in a subclass?

MyLoginViewController is a subclass of PFLogInViewController.

logInViewController is an object of type MyLogInViewController in MainViewController.m

i.e.

//  MainViewController.m

    MyLogInViewController *logInViewController = [[MyLogInViewController alloc] init];
            logInViewController.delegate = self;
            logInViewController.fields = PFLogInFieldsUsernameAndPassword | 
                                                     PFLogInFieldsTwitter | 
                                                    PFLogInFieldsFacebook | 
                                                PFLogInFieldsSignUpButton | 
                                                PFLogInFieldsDismissButton;

As you can see the fields property is being set here in MainViewController.m

I want to set this in MyLogInViewController, so that every MyLogInViewController object has it set.

However, fields is of type readonly As seen from : https://www.parse.com/docs/ios/api/Classes/PFLogInView.html#//api/name/fields

@property (nonatomic, readonly, assign) PFLogInFields fields

  1. How can I override this? (I have thought about using a custom getter - but don't know how to execute properly)

  2. Is what I'm trying to do considered bad practice, if so, why?

Edit: Turns out I was looking at the View Documentation not the ViewController Documentation. Thanks to mrt for spotting this.

Upvotes: 1

Views: 588

Answers (2)

mrt
mrt

Reputation: 623

If someone did something readonly, and they know what they are doing, that probably means it really shouldn't be set outside of the class. However, there may still be some reasons to do what you want to do. Why don't you do that in init method though?

Edit:

The fields property in PFLogInViewController can be set. So you can do this in your MyLogInViewController class init method

- (id)init
{
    self = [super init];
    if (self) {
        // Do aditional init stuff
        self.fields = PFLogInFieldsUsernameAndPassword | PFLogInFieldsTwitter | PFLogInFieldsFacebook | PFLogInFieldsSignUpButton | PFLogInFieldsDismissButton;
    }
    return self;
}

this way, you won't be interfering with the internals of the class.

Upvotes: 1

Giordano Scalzo
Giordano Scalzo

Reputation: 6342

Have you tried to declare

@property (nonatomic, readwrite, assign) PFLogInFields fields

in your subclass?

Upvotes: 0

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