Tab bar

A tab bar appears at the bottom of the application screen and allows you to quickly move from one section to another in the application. This is the most popular navigation structure for mobile applications. It usually contains between 4 and 5 tabs.

You can add secondary navigation to this main navigation, for example tabs in a section (at the top of the screen).

Create tab bar

As with any navigation element, it is best to use the foreground to create the tab bar. This way the tab bar is persistent throughout the application and you can use the states to represent the selection of each icon. 

Go to the foreground. 

Insert graphic elements

Import the graphic elements of your tab bar: the background bar and the icons. For the background bar, you can use a Shape. If you want to color your icons on selection, choose a .svg format or import your icon files in two colors. 
In the 1st foreground, represent your tab bar for the 1st section: here it is the "Articles" section. Visually make it easy for the user to know that the first icon has been selected. In this example, the selected icon is colored. (NB: if you want to create a home screen without a tab bar, you need to create a blank foreground. )

Create the link between each icon and its section

Above each icon, add an Interactive zone component, which allows you to expand the tap area. Link the Go to screen action to the right screen.

Decline other states

Decline the other sections ("Procedure", "Quiz", "Form") by creating new foreground states. Each state is linked to the previous one to keep the links and transitions. On each state, change the icon color and visually represent the selected icon.

Associate each section with the right foreground  

The last step is to associate each section with the right state! Go to the screen Properties and select the right state.  

Tips

iOS Guidelines : https://developer.apple.com/design/human-interface-guidelines/ios/bars/tab-bars/

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