Creating the TouchTracker Application

Now let’s get started with your application. In Xcode, create a new Window-based Application iPhone project and name it TouchTracker.

First, you will need a model object that describes a line. Create a new NSObject and name it Line. In Line.h, declare two CGPoint instance variables and two properties:

#​i​m​p​o​r​t​ ​<​F​o​u​n​d​a​t​i​o​n​/​F​o​u​n​d​a​t​i​o​n​.​h​>​

@​i​n​t​e​r​f​a​c​e​ ​L​i​n​e​ ​:​ ​N​S​O​b​j​e​c​t​ ​{​
 ​ ​ ​ ​C​G​P​o​i​n​t​ ​b​e​g​i​n​;​
 ​ ​ ​ ​C​G​P​o​i​n​t​ ​e​n​d​;​
@​p​r​o​p​e​r​t​y​ ​(​n​o​n​a​t​o​m​i​c​)​ ​C​G​P​o​i​n​t​ ​b​e​g​i​n​;​
@​p​r​o​p​e​r​t​y​ ​(​n​o​n​a​t​o​m​i​c​)​ ​C​G​P​o​i​n​t​ ​e​n​d​;​

In Line.m, synthesize the properties:

#​i​m​p​o​r​t​ ​"​L​i​n​e​.​h​"​ ...

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