Question

When I make an object to use in NIB, the object should implement -initWithCoder:. However I can’t figure out regular pattern implementing this.

I have been used this code.

- (id) initWithCoder:(NSCoder *)aDecoder
{
 if(self=[super initWithCoder:aDecoder])
 {
     // initialize my object.
 }
 return self;
}

But I have to make same code for UIView instantiated by code like this.

- (id) initWithCoder:(NSCoder *)aDecoder
{
 if(self=[super initWithCoder:aDecoder])
 {
     // initialize my object.
 }
 return self;
}
- (id) initWithFrame:(CGRect)frame
{
 if(self=[super initWithFrame:frame])
 {
     // initialie my obejct.
 }
 return self;
}

I feels something wrong. Any recommendations?

*Of source the initialization logic can be extracted into a new method, but it’s not a point.

Answer 1

Use awakeFromNib to initialize a UIView that’s being created from a NIB file. If you want to make it general so that it can be created either from a NIB file or programmatically, make a method like configureObject and call it from both the designated initializer (often initWithFrame:) and from awakeFromNib.

- (void)configureObject {
    // Do initialization here
}

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

    return self;
}


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