Trying to do some simple calculations in iOS project?

Question

I want to know how to do some simple equations in my iOS app, if anyone could point me in the right direction that would be wonderful!

I need to know how to convert an NSNumber that represents minutes to an NSString which represents hours and minutes (example: 100 = 1 hour and 40 minutes)

I also want to know if its possible to convert something like 2013-02-08T10:50:00.000 to 10:50AM

Thanks for any tips you guys might have.

He. Was there a comment above your previous one or something? — Josiah, Feb 10 '13 at 21:48
Yeah, that makes more sense. It looked like I needed to chill for my single sentence. :) I see you removed your follow up. Anyways, welcome to Stack Overflow. We hope you'll stick around. — Josiah, Feb 10 '13 at 21:52

oiledCode · Accepted Answer · 2013-02-10T20:55:51.137

1

For the conversion :

NSNumber *yourNumber = [NSNumber numberWithInt100];

NSInteger hour    = [yourNumber intValue] / 60;
NSInteger minutes = [yourNumber intValue] % 60;
NSString *time_stamp = [NSString stringWithFormat:@"%d hour and %d minutes",hour,minutes];

As the comments suggested you can use NSDateFormatter to format your NSDate.

edited Feb 10 '13 at 20:55

answered Feb 10 '13 at 20:38

oiledCode

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How do I set an @interface selector for intValue again? – Jon Sullivan Feb 10 '13 at 20:45
What?? sorry I did not understand your question – oiledCode Feb 10 '13 at 20:48
When I use your code, I get "No visible @interface for 'NSNumber' declares the selector 'intvalue'" – Jon Sullivan Feb 10 '13 at 20:49
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I've edited my answer, there was a typo "intvalue" -> intValue – oiledCode Feb 10 '13 at 20:56

Trying to do some simple calculations in iOS project?

1 Answers1