ITSwitch is a simple and lightweight replica of iOS 7 UISwitch for Mac OS X.

Not much to it, simply set the custom class of a NSView to ITSwitch in Interface Builder.

You can create an IBAction and simply connect the two in Interface Builder.

Additionally, you can use these two properties:

@property (nonatomic, setter = setOn:) BOOL isOn;
@property (nonatomic, strong) NSColor *tintColor;

Since ITSwitch uses its CALayer to draw a drop-shadow, you should also layer-back it's superview. If you don't use Core Animation, you can also simply embed the view in a layer-backed view.

You may want to consider setting the width of the view to the golden ratio * height.

So for example:

height = 20;
width = height * 1.618;