C4UIElements sliderActionValue

C4Workspace.m

//
// C4WorkSpace.m
//
// Created by Greg Debicki.
//

#import "C4WorkSpace.h"

@implementation C4WorkSpace {
    C4Slider *slider;
    C4Shape *shape;
    CGPoint p;
}

-(void)setup {
    shape = [C4Shape rect:CGRectMake(0, 0, 200, 200)];
    p = self.canvas.center;
    p.y -= 50;
    shape.center = p;
    [self.canvas addShape:shape];
    
  slider = [[C4Slider alloc] initWithFrame:CGRectMake(0, 0, 400, 44)];
    p.y += 200;
    slider.center = p;
    [slider runMethod:@"adjustRotation:" target:self forEvent:VALUECHANGED];
    [self.canvas addSubview:slider];
    
}

-(void)adjustRotation:(C4Slider *)sender {
    shape.rotation = sender.value * TWO_PI;
}

@end

Here is a link to a gist that updates the alloc/init section of C4Slider. https://gist.github.com/drart/6656653