Sending messages to RubyCocoa from Obj-C with attributes | 07. Mai 2009 um 14:07 Uhr / Programming

Eingestellt am 07. Mai 2009 um 14:07 Uhr » Programming

I know that MacRuby is on the way and so on but I began Twittia in RubyCocoa, I wouldn't repeat that mistake, and I have to deal with it. The next time I'll write in Objective-C from the beginning.

Anyway, I found some nice classes which I needed for my project and they where written in Objective-C. I know how to send a message to a Objective-C object, you just replace the colons with underscores so

[myObject doSomethingWithObject:bar andOtherObject:baz];

would be in ruby

maObject.doSomethingWithObject_andOtherObject(bar, baz)

But what to do if you have to send a message to a RubyCocoa object?

Ok at the beginning it was easy, just reverse it, so

obj.doSomething

would just be

[obj doSomething];

and it worked great! But then I wanted to send some attributes like in the first example so I tried to send a object:

[obj takeThisObject:self]

and it also worked fine, but then I tried to send it a int which is a primitive type:

int i = 1; [obj takeThisInt:i]

and my programm would crash.

So after half a day I figured out that RubyCocoa takes only objects and crashes if you try to send it a primitive type. I Now first make a

[obj takeThisNumber:[NSNumber numberWithInt:i]];

and now it finally works.