1. Enable the user to draw using the colors red, green, and blue. Add three buttons at the top of the app. When the user taps a button for a given color, all subsequent dots and lines should be drawn...

1.
Enable the user to draw using the colors red, green, and blue. Add three buttons at the top of the app. When the user taps a button for a given color, all subsequent dots and lines should be

drawn using that color. Use the refactored DRY code example to make the modification easier.

2.
Enable the user to save and restore the current drawing. You do not need to provide permanent

storage, but you do need to be able to restore the canvas to a previous state while the app is

running.