2. Input / Button
This is a picture from Airbnb on Android 4.4
How to achieve the same thing with Ionic2?
What other alternative would you prefer instead of this?
There’s no default Ionic component that’s going to do number 2 for you with a simple cut and paste. I’d take a look at this section http://ionicframework.com/docs/v2/components/#gestures to learn how to leverage tap events to increase a counter like that one. The CSS itself should be pretty straightforward.
I have an idea for the css now. I was thinking about combining 2 round buttons but now I am leaning toward this solution: A div with custom borders having two small, clear buttons.