Question

Xcode increment counter in an iPhone app

Asked by: tickett

I'm just starting to learn cocoa / xcode etc and have read some books and trying to get stuck in!

I've simply dropped a button on a blank canvas and changed the caption to 0. I've added a class and connected up as needed.

I've then popped in the attached code (It was a lot simpler but i had to add stuff as i was initially getting errors about casting pointers as integers and vice versa).

When i simulate each time i click the button the caption changes to a seemingly random number;
61923153
58825697
etc

I expect i've messed up in the converting/casting. Please help!

Thanks
L

@implementation testClass
- (IBAction)incrementCounter:(id)sender {
	int countV = (int)[counterValue titleForState:UIControlStateNormal];
	countV++;
	NSString *intString = [NSString stringWithFormat:@"%d", countV];
    [counterValue setTitle:intString forState:UIControlStateNormal];
}
@end

                                  
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Asked On
2009-10-22 at 09:28:35ID24835172
Tags

iPhone

,

xcode

,

cocoa

,

cast

,

Cocoa

Topic

Apple Programming

Participating Experts
1
Points
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Comments
3

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Answers

 

by: matttroutPosted on 2009-10-22 at 10:14:42ID: 25636536

instead of doing countV++ did you try countV = countV + 1?

 

by: tickettPosted on 2009-10-22 at 10:25:19ID: 25636684

Still no joy.

If i do countV = 10 it works though... so;
int countV = (int)[counterValue titleForState:UIControlStateNormal];
is obviously not working... is there a better way to convert a string to an int?

 

by: tickettPosted on 2009-10-23 at 08:55:32ID: 25645645

I cracked it... i misunderstood the documentation for converting NSString to an integer...

switched (int)blah with [blah intValue] and voila :)

See working code below.

#import "testClass.h"
#import <Foundation/Foundation.h>
 
@implementation testClass
- (IBAction)incrementCounter:(id)sender {
	int countV = [[counterValue titleForState:UIControlStateNormal] intValue];
	countV++;
	NSString *intString = [NSString stringWithFormat:@"%d", countV];
    [counterValue setTitle:intString forState:UIControlStateNormal];
}
@end

                                              
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