With all tools you learn, you need to create an awesome app to manage one view background color.
You will build an app like the screenShot below.

• Make a new Xcode app and name it : Slader Color
• You need to make a view with the following elements : view for display the results (your final color), 3 sliders for change the red,green and bleu value, 3 switch button to change turn on/off the color state.
• You need to have a "Reset Button" to initialize your color (back to Black color).

To make a color, you need 4 informations. Red, Green, Blue and Alpha. Alpha is the opacity of the view.
So find the best way to change the background color of the view by using the 3 sliders.

If you got some time you can custom your app like the following screenshot.

Sunday 17 October