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Re: Copying Notification Dictonaries & sortingUsingSelector problems
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Re: Copying Notification Dictonaries & sortingUsingSelector problems


  • Subject: Re: Copying Notification Dictonaries & sortingUsingSelector problems
  • From: <email@hidden>
  • Date: Wed, 26 Jun 2002 17:58:44 +0200
  • Thread-topic: Re: Copying Notification Dictonaries & sortingUsingSelector problems

My god, these people at our IT department... First my original email got send twice for some mysterious reason, for which I deeply appologize. Next, the emailserver has been out of business (guess what brand of OS it runs) the whole day, and now they simply leave because it's 5 o'clock. Then I thought to reply via another email account, but I got a reply from the list moderator that I was not a member, so sorry for the late reply after you responded so quick John...
I wrote:
>> But when I run the program the following message is logged:
>>
>> -[NSCalendarDate sortExperiments:]: selector not recognized

You answered:
>The obvious problem is that you're sending the -sortExperiments:
>message to a date, not to the array of experimentKeys.

I figured that, but I don't get it, because I'm 100% sure that experimentKeys is an array, containing NSCalendarDates. So I what I thought was that the sortExperiments method is triggered with as it's argument the NSCalendarDates derived from the array. Why then, as the sortExperiment: function takes an NSCalendarDate, doesn't it work? What would be the best approach to let me sort the experiments on their property stopdate. To summarize, I have the following situation:
NSArray experimentKeys: startdate Experiment1, startdate Experiment2 etc.
Sort this array by:
1 retrieving startdates, use these keys to look up the corresponding experiment objects from the experimentsDict dictionary.
2 ask these objects for their stopdate
3 sort the array by asking the objects their stopdate

Many thanks in advance!
Alex

>Then finally I have one other problem I can't overcome without help.
>In my program I track a number of laboratory experiments via an experiment object for each one. >This object I instantiate with a "startdate", "time" and "stopdate" variable. All the experiment >objects are stored in "experimentDict", a mutable dictionary with the startdate as it's key. At the >same time this startdate is stored in an array that serves the tableview with data. So as a result my >tableview shows all experiments, but I would like to sort the experiments by there stopdates. >Sorting their startdates is easy, as I only have to sort the array. But now sorting by stopdate, a >property of each experiment. I thought of using :
>
>[experimentKeys sortUsingSelector: @selector(sortExperiments:)];
>
>// experimentKeys is the array containing the keys to retreive the objects from
>// the experimentDict
>
>Later on I done have the sort function:
>
>- (NSComparisonResult)sortExperiments: (NSCalendarDate*) startdate{
> Experiment* exp1; // first experiment object
> Experiment* exp2; // second experiment object
>
> exp1 = [experimentDict objectForKey: self];
> exp2 = [experimentDict objectForKey: startdate];
>
> if ([[[exp1 stopdate] laterDate: [exp2 stopdate]] isEqualToDate:
> [exp2 stopdate]]){
> return NSOrderedAscending;
> }
> else if ([[[exp1 stopdate] laterDate: [exp2 stopdate]] isEqualToDate:
> [exp1 stopdate]]){
> return NSOrderedDescending;
> }
> else{
> return NSOrderedSame;
> }
>
>}
>
>But when I run the program the following message is logged:
>
>-[NSCalendarDate sortExperiments:]: selector not recognized
>
>Could anyone help me to sort my data?? Any help, comments and suggestions are appreciated >enormously!
>
>Alex
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