iOS new to iPhone programming

[chaosal]

hey guys been looking through a lot of info on the web but can't understand what i'm doing wrong:

my .h file:

@interface myClass : NSObject {

	NSString* colour;
}

- (NSString*) colour;
- (void) setColour:(NSString*)input;

@end

my .m file:

@implementation myClass

- (NSString*) colour {
    return colour;
}

- (void) setColour: (NSString*)input {
    colour = input;
}    

- (void) dealloc
{
    [colour release];
    [super dealloc];
}

@end

using myClass:

myClass *test = [[myClass alloc] init];
[myClass setNumber:10];

the error i get:

010-01-26 20:59:36.540 myApp[6428:207] *** -[NSCFString setNumber:]: unrecognized selector sent to instance 0x405c
2010-01-26 20:59:36.542 myApp[6428:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSCFString setNumber:]: unrecognized selector sent to instance 0x405c'

any help or just pointing me in the right direction would be greatly appreciated thanks

 

[icewing]

hey guys been looking through a lot of info on the web but can't understand what i'm doing wrong:

my .h file:

@interface myClass : NSObject {

	NSString* colour;
}

- (NSString*) colour;
- (void) setColour:(NSString*)input;

@end

using myClass:

myClass *test = [[myClass alloc] init];
[myClass setNumber:10];

the error i get:

010-01-26 20:59:36.540 myApp[6428:207] *** -[NSCFString setNumber:]: unrecognized selector sent to instance 0x405c
2010-01-26 20:59:36.542 myApp[6428:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSCFString setNumber:]: unrecognized selector sent to instance 0x405c'

any help or just pointing me in the right direction would be greatly appreciated thanks

You're calling a method called setNumber, but all I see in your class is a method called setColour.

 

[chaosal]

oops sorry been testing loads and posted the wrong bit, this is what i'm actually trying to do:

myClass *test = [[myClass alloc] init];
NSString *testString = @"blue";
[test setColour:testString];

 

[dejo]

oops sorry been testing loads and posted the wrong bit, this is what i'm actually trying to do:

myClass *test = [[myClass alloc] init];
NSString *testString = @"blue";
[test setColour:testString];

And you're still getting

-[NSCFString setNumber:]: unrecognized selector sent to instance 0x405c

from this new code?

EDIT: P.S. It's also common convention to name classes starting with a capital letter so as to not confuse them with (commonly) lower-case-started instance variables. I.E. MyClass would be the conventional approach.

 

[chaosal]

ok thanks will remember that and yeah im still gettin the same error:

*** -[NSCFString setColour:]: unrecognized selector sent to instance 0x405c

really don't know why it's failing, should be such a simple thing :S

 

[dejo]

I'm not getting any errors when running that code. Your code must be different than what you included. It's complaining that you are trying to call the instance method setColour: on an object of NSString type. Are you seeing any warnings when building?

 

[North Bronson]

I also think it's a good idea to realize that you might not be following the best practice with your setter. In your setColour: method, you have:

colour = input;

but then in your dealloc, you have:

[colour release]

Do you see where you might have a problem with this?

 

[skunkworker]

I would recommend using a @property
some thing like this

 @property ( nonatomic,retain) NSString * color;

then just call

[self setColor: myColor];

and it will properly retain and release it. But don't make a setColor method. ( it makes one for you)