iOS Human Interface Guidelines.

Color is a great way to provide status information, give feedback in response to user actions, and help people visualize data. Color is a great way to provide status information, give feedback inresponse to user actions, and help people visualize data.

Stick to the Essentials in Tutorials.

Color is a great way to provide status information, give feedback in response to user actions, and help people visualize data. Color is a great way to provide status information, give feedback inresponse to user actions, and help people visualize data.

Use Motion effects judiciously.

Color is a great way to provide status information, give feedback in response to user actions, and help people visualize data. Color is a great way to provide status information, give feedback inresponse to user actions, and help people visualize data.