Re: help with methods
Re: help with methods
- Subject: Re: help with methods
- From: Rounak Jain <email@hidden>
- Date: Thu, 29 Jul 2010 09:56:56 +0530
On Jul 29, 2010, at 4:17 AM, Ken Thomases wrote:
On Jul 28, 2010, at 1:27 PM, Rounak Jain wrote:
(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
Thanks Ken.
Ok, i see that the method signature above is one with multiple
parameters like this one in the ObjC documentation:
[myRectangle setOriginX: 30.0 y: 50.0];
Now that I have understood this, I feel that the following statements
are unnecessary when I am having only one column in my application:
NSString *identifier = [aTableColumn identifier];
// Set the value for the attribute named identifier
[newVar setValue:anObject forKey:identifier];
Merely,
[toDoList objectAtIndex:rowIndex];
is enough for my needs.
But I don't understand what
[toDoList objectAtIndex:rowIndex];
means.
(toDoList is my array containing strings)
And does it have anything to do with:
- (id)tableView:(NSTableView *) tv
objectValueForTableColumn:(NSTableColumn *)tableColumn
row:(int)row
{
NSString *v = [toDoList objectAtIndex:row];
return v;
}
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