Re: ObjC Question - labeled arguments

• Subject: Re: ObjC Question - labeled arguments
• From: Andrew Farmer <email@hidden>
• Date: Wed, 21 May 2008 22:38:38 -0700
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- (void)reset:(RulerStyle*)newStyle:(int)newSide:(int)textLoc: (double)newScale;

That syntax is pretty obscure. Try reading it as

- (void)reset:(RulerStyle*)style
   newStyle:(int)newStyle
    newSide:(int)newSide
    textLoc:(double)newScale;

and see if that makes any more sense. (Some of the types seem a little odd for the argument names, but that's what the method signature reads as.)

If this still doesn't make sense, check the header file for the code you're interfacing with.

I probably should have explained that I am calling my own ruler implementation so that object and method is my own. In C++ it is:

void reset(RulerStyle* newStyle, int newSide, int textLoc, double newScale);

- (void)reset:(RulerStyle *newStyle)
      newSide:(int)newSide
      textLoc:(int)textLoc
     newScale:(double)newScale;

You'd call this as

[obj reset:style newSide:123 textLoc:456 newScale:3.14159];

or whatnot.

So my question is - is there a way to include the first label? I note that the examples in the ObjectiveC manual seem to leave the first one out also:

[myRect setWidth:10.0 :15.0]; ---> [myRect setWidth:10.0 height: 15.0];

They shouldn't - that's invalid. Every "label" is a component of the method name - [myRect setWidth:10.0 height:15.0] is calling a completely separate method from [myRect setWidth:10.0 somethingElse: 15.0].

Well that example is straight out of the manual:

This method name uses unlabeled arguments. Unlabeled arguments make it difficult to determine the kind and purpose of a method’s arguments. Instead, method names should include labels describing each of their arguments...

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