Re: help with methods
Re: help with methods
- Subject: Re: help with methods
- From: Ken Thomases <email@hidden>
- Date: Wed, 28 Jul 2010 17:47:54 -0500
On Jul 28, 2010, at 1:27 PM, Rounak Jain wrote:
> I am comfortable with understanding method declarations like
> - (void) someName: (NSString *) variableName;
> where
> void is return type
> someName is name of the method
Close. "someName:" _with the colon_ is the name of the method. There's a difference between "someName" and "someName:".
> (NSString *) is the type of the variableName and variableName is the variable
>
> However, I feel helpless when I see something like this:
>
> - (void)tableView:(NSTableView *)aTableView
> setObjectValue:(id)anObject
> forTableColumn:(NSTableColumn *)aTableColumn
> row:(int)rowIndex {
>
> NSString *identifier = [aTableColumn identifier];
> data *newVar = [toDoList objectAtIndex:rowIndex];
>
> // Set the value for the attribute named identifier
> [newVar setValue:anObject forKey:identifier];
> }
>
> All I know is that this method lets me put the content of array toDoList into the TableView. Please give me a detailed breakdown of what this is.
Objective-C method signatures have the name broken up in pieces with the parameters between them. They're like fill-in-the-blank sentences.
The method name here is tableView:setObjectValue:forTableColumn:row:. Each colon is a blank in the sentence to be filled in by the invoker. It has a void return. Its parameters are: aTableView of type NSTableView*; anObject of type id; aTableColumn of type NSTableColumn*; and rowIndex of type int.
Does that help? Have you read Apple's introductory documentation about Objective-C and Cocoa?
Regards,
Ken
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