Question

Suppose I have two buttons that are ivar outlets. One is called “Blue” and the other “Red.” Now, I have an NSString with the value of “Red.” I want to set the button identified by the NSString to a selected state, without using if.

I do not want to do this:

NSString *button=@"Red";
if ([button isEqualtoString:@"Blue")
   self.blue.selected=YES; //self.blue and self.red are UIButtons
else
   self.red.selected=YES;

This is fine if you have two buttons, but I have quite a lot more than that, and it would be quite inelegant and cumbersome to do this for like 30 buttons.

I’d much rather find a way to directly link the name of a UIButton ivar to the value of an NSString.

Answer 1

Put the string lower case and
you can use KVC for that :

[self setValue:[NSNumber numberWithBool:YES]
    forKeyPath:[NSString stringWithFormat:@"%@.selected", button]];