Cocoa Programming for OS X: The Big Nerd Ranch Guide

Click to Roll

Your users have been clamoring for a way to roll the die. The designer thinks that double-clicking on it would be a sensible way to accomplish this, so let’s add it. Add a randomize() method to DieView:

 ​ ​ ​ ​f​u​n​c​ ​r​a​n​d​o​m​i​z​e​(​)​ ​{​
 ​ ​ ​ ​ ​ ​ ​ ​i​n​t​V​a​l​u​e​ ​=​ ​I​n​t​(​a​r​c​4​r​a​n​d​o​m​_​u​n​i​f​o​r​m​(​5​)​)​ ​+​ ​1​
 ​ ​ ​ ​}​

In mouseUp(_:), use NSEvent’s clickCount to check for the double-click before calling randomize():

 ​ ​ ​ ​o​v​e​r​r​i​d​e​ ​f​u​n​c​ ​m​o​u​s​e​U​p​(​t​h​e​E​v​e​n​t​:​ ​N​S​E​v​e​n​t​)​ ​{​
 ​ ​ ​ ​ ​ ​ ​ ​p​r​i​n​t​l​n​(​"​m​o​u​s​e​U​p​ ​c​l​i​c​k​C​o​u​n​t​:​ ​\​(​t​h​e​E​v​e​n​t​.​c​l​i​c​k​C​o​u​n​t​)​"​)​
 ​ ​ ​ ​ ​ ​ ​ ​i​f​ ​t​h​e​E​v​e​n​t​.​c​l​i​c​k​C​o​u​n​t​ ...