CODEWITHSUNDEEP
iosobjective-cuiimageview
Teo
Teo

Reputation: 3442

UIImageView subclassing

I want to create a custom class RoundedImageView by subclassing the UIImageView class.

In order to make it round, I use the following code:

    self.layer.cornerRadius = self.frame.size.width/2;
    self.layer.masksToBounds = YES;

Where should I place this code? In the initializer? Or maybe in layoutSubviews? I know there's not a good idea to access properties from self within the initializer(because self may not be fully initialized), that is why I am confused and I'm not sure where to place this code.

Upvotes: 0

Views: 76

Answers (2)

sergio
sergio

Reputation: 69047

The initialisation method is definitely the right place, since you want to set those properties only once.

About your concern related to acessing properties, the idea is that a property accessor could be overridden in a derived class and thus access portions of the object not already properly initialised. This is not a great concern in your case, I would say, unless you plan to override layer's getter in some not fully sensible ways.

Upvotes: 1

user3386109
user3386109

Reputation: 34839

The canonical initialization for a UIView (or any class derived from UIView) looks like this

- (void)setup
{
    // do any initialization here
}

- (void)awakeFromNib
{
    [self setup];
}

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];

    if (self) 
        [self setup];

    return self;
}

This works for views that are created by storyboard and views that are created programmatically. Source: the CS193P videos.

Upvotes: 1

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