Question

I have created a subclass for a UIButton and was hoping to pass a custom property to it. However, it’s not working and I’ve since read that subclassing a UIButton isn’t a great idea.

MY question is how do I assign a custom property to a button? I am creating a button which is being placed in the headerview of a grouped table. I want to pass to that button the section number. I’ve done this successfully with a UISwitch in each row, but can’t use the same method for the UIButton.

So I create a button

MattsButtonClass *button = [MattsButtonClass buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(240, 15, 45, 30);
button.MFsectionNo = section; //this would be 1, 2 etc
//etc

So how do I actually do this? you’ll see that my UIbutton has a subclass, which looks like this

//.h file
@interface MattsButtonClass : UIButton {
    int MFsectionNo;
}

@property (nonatomic) int MFsectionNo;

@end

//.m file
@implementation MattsButtonClass

@synthesize MFsectionNo;


@end

The error on the above is

-[UIRoundedRectButton MFsectionNo:]: unrecognized selector sent to instance 0x5673650
2010-09-07 22:41:39.751 demo4[67445:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[UIRoundedRectButton MFsectionNo:]: unrecognized selector sent to instance 0x5673650'

Is what I am trying not possible? Thanks for any help…

Answer 1

You could probably just use the tag property of UIButton to store your section number (maybe with an offset, since tag is 0 by default)