To edit the list, we need … a list 🙂 If you want to learn how to create a task list, see this post: Renering list in React Native

Jak wiemy z dokumentacji React Native, ScrollView renderuje wszystkie swoje dzieci na raz, co przy dużej ich ilości może powodować problemy z wydajnością. Istnieje jednak sposób, by rozłożyć renderowanie dużej ilości danych w czasie tak, aby użytkownik nie odczuł tych problemów. Możemy wyświetlić przykładowo 20 elementów przy pierwszym wczytaniu danych i dodawać kolejno nowe elementy w miarę przewijania listy. Tak stworzymy “niekończące się” przewijanie, tzw. “infnite scroll”.

As we know from React Native documentation, ScrollView renders all of its children at once, which can cause performance problems with a large number of them. However, there is a way to spread in time rendering of large number of data, so that the user does not feel these problems. For example, we can display 20 items at the first time when load data and add new items one by one while scrolling the list. That’s how we’ll create “endless” scrolling, so-called “infnite scroll”.

Ok, we want to display a list of items in React Native. We can do it in several ways, but here – two will be presented – ScrollView and FlatList.

Setting the dimensions of elements used in React Native applications often causes problems. Therefore, we’ll look at several ways that will helps with better matching the view width and height relative to both – parent and screen.

It often happens that we want to change the dimensions of the button, which by default is extended to the entire width of the parent element. While reducing its width is not a problem – it is enough to reduce the width of the parent, but changing the height is already problematic. The Button element has no style property, so apart from changing the text color on iOS and the background color on Android, we can not set much in it.