Objective C Question

[ibly31]

I doubt anyone here knows, but its worth a try. I'm making a swimming time converter app for my ipod touch. I have a picker view and I need to have event:minutes:seconds:hundredths as the pickers rows. The events I have already created an NSArray for, but I really don't feel like writing out

Code: Select all

NSArray *eventTypes = [[NSArray alloc] initWithObjects:@"00",@"01",@"02" etc...];

Is there a way to do it like this:

Code: Select all

NSLog(@"I'm used to C++")

NSArray *eventMinutes = [[NSArray alloc] init];

for x 1 through 60
{
nsarray[x] = x;
}

Please help!

[Innerscope]

I'd try to help you, but I'm not even sure what you're trying to accomplish. Why do you use an array if you just want a counter?
Look at this site, hopefully it will help: http://www.otierney.net/objective-c.html

[ibly31]

To use a picker view, The little dial, you need to specify the NSArray to use for the objects in it. Its kinda like the drop down lists in web pages, except instead of using easy tags inside the bigger drop down list tag, I have to specify an array. I'm not familiar with ObjC so that is why I am asking.

[Innerscope]

To use a picker view, The little dial, you need to specify the NSArray to use for the objects in it. Its kinda like the drop down lists in web pages, except instead of using easy tags inside the bigger drop down list tag, I have to specify an array. I'm not familiar with ObjC so that is why I am asking.

Ok, I guess a more appropriate question would be, why use a UIPickerView? Couldn't you just use a UILabel with an NSTimer?
I guess I'm really confused by the what you mean by "swimming time converter".

[ibly31]

What I want the user to do is to put in their time, change the settings(Long course meters, short course meters,yards) and convert their time from meters to yards or vice versa. The Pickerview would come up with something like this:
___________________________
| 200 Breast | 00 | 00 | 00 |
| 100 Butter | 00 | 00 | 00 |
| 200 Butter | 00 | 00 | 00 |
| 300 Breast | 00 | 00 | 00 |
===========================
Event type Min Sec Hundredths

[Innerscope]

What I want the user to do is to put in their time, change the settings(Long course meters, short course meters,yards) and convert their time from meters to yards or vice versa. The Pickerview would come up with something like this:
___________________________
| 200 Breast | 00 | 00 | 00 |
| 100 Butter | 00 | 00 | 00 |
| 200 Butter | 00 | 00 | 00 |
| 300 Breast | 00 | 00 | 00 |
===========================
Event type Min Sec Hundredths

hmm, ok. So you want the user to enter a time then select meters/yards, then convert that number accordingly?
Would this work?: http://img.photobucket.com/albums/v323/ ... UIPict.png
That would be easier to implement IMO.

I can kinda see why you want to use the UIPickerView, but from what I read on it, I feel like it's making things more complex then they have to be.
If you're stuck on using it though, I can't really help you cause I've never used one. Looking at the reference should help you figure it out though:
http://developer.apple.com/iphone/libra ... rView.html

[ibly31]

Well the different amount of meters/yards would make the conversions different, so a 200 breast and a 100 breast are very different. Also the problem isnt the UIPickerView, its the NSArray. I would just like to know how to add objects to an NSArray through a loop.

[Innerscope]

Well the different amount of meters/yards would make the conversions different, so a 200 breast and a 100 breast are very different. Also the problem isnt the UIPickerView, its the NSArray. I would just like to know how to add objects to an NSArray through a loop.

Alright, I still feel like this is more complicated than it needs to be (my example as well), but we'll roll with it.

NSArray's AFAIK are static. Meaning, they can't be re-sized dynamically. However, you can initialize an NSArray with a C array, using the initWithObjects method. (check out the documentation for more info: http://developer.apple.com/iphone/libra ... tm/NSArray )

You could also try to use an NSMutableArray (array capable of mutating= dynamic re-sizing):

Code: Select all

	NSMutableArray *eventMinutes = [[NSMutableArray alloc] init];
	int x;
	NSNumber *min;
	NSString *readableMin;
	for(x=1; x< 61; x++){
		min = [NSNumber numberWithInt:x];
		readableMin = [min stringValue];
		[eventMinutes addObject:readableMin];
	}

There are probably more optimized ways of going about what I did. That was kinda quick and dirty, but I hope that helps. Also remember that "research assistant" (help>research assistant) is you're best friend in Xcode.