A simple vertical stepper control for iOS that is similar in function to the UIStepper control. Personally, I think it was short-sighted of Apple to only release a horizontal stepper control, so this was created to remedy that.

Note: RPVerticalStepper is a subclass of UIControl so it inherits all characteristics of a typical control object.

Options

• Uses floats so your output can be either a float value or you can change the precision (via NSString's stringWithFormat method) to show it as whole number.
• Set minimum & maximum values for the stepper. When the stepper reaches either of these limits, it automatically disables the button and prevents the user from surpassing the limit.
• Turn on auto-repeat to keep incrementing/decrementing the value for as long as the user's pressing on the button.
• Change the auto-repeat interval so that the stepper will change faster or slower.
• You can add the control to a NIB/Storyboard or you can add it to the subview programmatically.

Public Properties (that you can override)

• value (CGFloat, defaults to 1) : The current value of the stepper control
• minimumValue (CGFloat, defaults to 1) : The minimum value the stepper value can be before the decrement button is disabled
• maximumValue (CGFloat, defaults to 99) : The maximum value the stepper value can be before the increment button is disabled
• stepValue (CGFloat, defaults to 1) : The amount that the value is changed by when the increment or decrement buttons are pressed
• autoRepeat (BOOL, defaults to YES) : Sets whether the stepper should keep changing the value for as long as the user's finger is pressed down on the control
• autoRepeatInterval (CGFloat, defaults to 0.5 seconds) : Sets the interval at which auto-repeat should change the stepper value

Change Callback Options

• Use the control in the standard way and hook up an IBAction to the Value Changed event in Interface Builder
• Or have your view controller conform to the RPVerticalStepperDelegate protocol and then use the stepperValueDidChange: method to know when the stepper value has changed
• Both of the above methods are shown in the example project

Quick Examples

The code base comes with an example project:

• Example: A simple example showing how to use use the stepper control in two different ways

And here is a basic example assuming you've added the control to a NIB or Storyboard file:

In the .h header file:

#import <UIKit/UIKit.h>
#import "RPVerticalStepper.h"

@interface ViewController : UIViewController

@property (nonatomic, weak) IBOutlet UILabel *stepperLabel;
@property (nonatomic, weak) IBOutlet RPVerticalStepper *stepper;

@end

In the .m implementation file:

#import "ViewController.h"

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    // Set some different defaults
    self.stepper.value = 1.0f;
    self.stepper.minimumValue = -100.0f;
    self.stepper.maximumValue = 100.0f;
    self.stepper.stepValue = 5.0f;
    self.stepper.autoRepeatInterval = 0.1f;
}

// This is called from the control event hooked up to the control in the Storyboard
- (IBAction)stepperDidChange:(RPVerticalStepper *)stepper
{
    self.stepperLabel.text = [NSString stringWithFormat:@"%.f", stepper.value];
}
@end

License

Essentially, this code is free to use in commercial and non-commercial projects with no attribution necessary.

See the LICENSE file for more details.