We revisit the Hello Location - Location Updatesexample from Chapter 3, Using Location in your iOS Apps Core Location, and add the heading component to our application. Here is what we will achieve: Our application will check for heading information, and as we move the device left/right, we will adjust the on-screen slider to reflect the change in the direction.
1. We begin with defining a
UISliderobject in our app in theHello_LocationViewController.hfile, and expose it as a property.@property (strong, nonatomic) IBOutlet UISlider *XSlider;
2. We also declare three additional properties of type
UITextFieldthat will hold theX, Y, andZvalues retrieved from the magnetometer. Of this, our interest lies in theXvalue. We will use this to move the slider, as we move right /left.@property (strong, nonatomic) IBOutlet UITextField *XVALUE; @property (strong, nonatomic) IBOutlet UITextField *YVALUE; @property (strong, nonatomic)...