On 26/06/2009, at 11:54 AM, Keary Suska wrote:
On Jun 25, 2009, at 7:33 PM, Peter Zegelin wrote:
I have come across what seems to be a weird situation and can't
really think of a good solution. I'm relatively new to Cocoa so its
probably just a simple misunderstanding.
I have a subclass of NSViewController that also acts as the
delegate for the NSTableView that it controls. This tableview is
loaded into my main window. I want to be able to hide some columns
in the tableview and as a result, the number of rows in the
tableview will vary according to numColumns. ie:
-(int)numberOfRowsInTableView:(NSTableView *)tableView{
return myDataSize/numColumns;
}
Now, I haven't got around to actually varying the number of columns
in the table yet, but I do have a property 'numColumns' that I set
to a reasonable value in awakeFromNib:
- (void)awakeFromNib{
numColumns = 8;
}
Unfortunately my numberOfRowsInTableView is being called 'before'
awakeFromNib, so initially numColumns = 0 and I get an error
(myDataSize/numColumns will be infinite).
I always thought awakeFromNib would get called first. But in this
case not so. So can anyone suggest why, and a workaround?
There is no such guarantee for -awakeFromNib. You either need to set
the value earlier, or call -reloadData on the table.
Well I guess the question then becomes 'where is earlier'!
I tried overloading NSViewController::loadView and it also gets called
'after' the first call to numberOfRowsInTableView.
If I have the 3 methods awakeFromNib, numberOfRowsInTableView and
loadView this is the calling sequence I get:
numberOfRowsInTableView
awakeFromNib
loadView
numberOfRowsInTableView
numberOfRowsInTableView
objectValueForTableColumn <- drawing will start here I guess
Grahams suggestion is a good workaround (thanks!) but I still don't
quite get it.
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