Connecting a Slider, a Stepper and a Label.

C4WorkSpace.m

#import "C4WorkSpace.h"

@implementation C4WorkSpace

-(void)setup {
    [self createAddObjects];
    //calibrate the min/max values
    self.myStepper.minimumValue = 0.0f;
    self.myStepper.maximumValue = 10.0f;
    
    self.mySlider.minimumValue = 0.0f;
    self.mySlider.maximumValue = 10.0f;
}

-(void)sliderWasUpdated:(C4Slider *)slider {
    slider.value = [C4Math round:slider.value];
    self.myLabel.text = [NSString stringWithFormat:@"%4.2f",slider.value];
    self.myStepper.value = slider.value;
    [self.myLabel sizeToFit];
}

-(void)stepperWasUpdated:(C4Stepper *)stepper {
    self.myLabel.text = [NSString stringWithFormat:@"%4.2f",stepper.value];
    self.mySlider.value = stepper.value;
    [self.myLabel sizeToFit];
}

-(void)createAddObjects {
    //set up the objects
    self.myLabel = [C4Label labelWithText:@"values"];
    self.myStepper = [C4Stepper stepper];
    self.mySlider = [C4Slider slider:CGRectMake(0, 0, 192, 44)];
    
    //position them
    CGPoint centerPoint = CGPointMake(self.canvas.center.x,
                                      self.canvas.center.y - 100);
    self.myStepper.center = centerPoint;
    
    centerPoint.y += 100;
    self.myLabel.center = self.canvas.center;
    
    centerPoint.y += 100;
    self.mySlider.center = centerPoint;
    
    //set up action bindings
    [self.mySlider runMethod:@"sliderWasUpdated:"
                      target:self
                    forEvent:VALUECHANGED];
    [self.myStepper runMethod:@"stepperWasUpdated:"
                       target:self
                     forEvent:VALUECHANGED];
    
    [self.canvas addObjects:@[self.myStepper,self.myLabel,self.mySlider]];
}

@end