Simplicity is a key factor in software development. If you are an experienced developer, you kind of feel when something is wrong if many steps are required to perform a simple action. You may ask yourself: Do I really need to create a delegate or a method and addTarget to simply handle a UI event?

I recently became interested in functional and reactive programming and the natural way to go functional in Objective-C was using ReactiveCocoa library. I remember the first time when I used it; I got completely amazed about the way it worked and how powerful it was. Additionally, it solved the UI control event problem by just using rac_signalForControlEvents and attach a code block. Much better that the delegate and addTarget paraphernalia.

Then Swift was out, which included the map/filter/reduce, and I was using ReactiveCocoa mainly to handle UI events. So I realized that it was an overkill.

To solve this I created this helper library that allows me to focus on the important part of my apps and quickly add code to UI events.

https://github.com/saulogt/UIKevent

See how simple it is to add some code to a UI event:

// Many ways to do this
barButton.onClick {(barBtn: UIBarButtonItem) in
    print("Clicked");
};

button.onClick { (btn) in
    print("Button clicked");
}

swt.onChange(handler: { (ctrl : UISwitch) in
    print("swt changed");
})

slider.onChange { (sld) in
    print("slider change to \(sld.value)");
}

stepper.onChange { (obj) in
    print("stepper change to \(obj.value)");
}

segControll.onChange { (obj) in
    print("seg change to \(obj.selectedSegmentIndex)");
}

It currently supports the following controls:

• UIBarButtonItem
• UIButton
• UISegmentedControl
• UIStepper
• UISlider
• UISwitch
• UIDatePicker