Having used Bootstrap for years, switching over to UiKit was a pleasant experience. I love how clear the codebase is and that everything is prefixed with uk-* to prevent overlapping classes if other frameworks/plugins are also used in a project. I love the semantic feel to all the class names, making it simple to remember without having to reference any documentation. Also, when necessary the documentation is nicely compiled and provides good examples of usage. The included default components are extensive (only missing a few I'd like to see) and the ability to compile your own files is very powerful - giving you the ability to slim it down even more by only including what you need and providing a simple way to override the default stylings at compile time.

1. Easy Customisation 2. Inbuilt Components 3. Amazing Interface

We can use drag and drop approach in Xcode Using UIKit , which makes yours designing faster. Auto layout is a great tool provided by UIKit to make our designs compatible with different Screen size.