Question

I’ve created a class with designated initializer defined that way:

-(id)initWithFrame:(CGRect)frame 
          aProperty:(float)value {

    self = [super initWithFrame:frame];

    if(self){   
        ///....do something 
    }
}

Now I wonder how to avoid direct calls to initWithFrame method, like:

MyClass *theObj = [MyClass alloc]initWithFrame:theFrame];

I thought about throwing exception in initWithFrame definition:

- (id)initWithFrame:(CGRect)frame
{
    @throw ([NSException exceptionWithName:@"InitError" 
                                    reason:@"This class needs to be initialized with initWithFrame:aProperty: method" 
                                  userInfo:nil]);
}

Is this a good solution ?

Answer 1

What about calling your designated initializer with a default value for aProperty ?