iOS Programming: The Big Nerd Ranch Guide (6th Edi   18. Touch Events and UIResponder

About the 18. Touch Events and UIResponder category (1)
Silver and Golden Challenges Solutions (1)
Writing Mistakes and Omission (3)
Solution for Ch 18 Silver, and Gold Challenge (4)
How can I adapt TouchTracker to draw freeform lines? (5)
Touch Tracker is building but not making lines (5)
Trouble with the chapter (3)
Do not send the message directly to the next responder (2)
"line" var in "override func touchesEnded" -- where is it coming from? (2)
18.Silver Challenge (3)