iPhone – Walkthrough

1
XCode

• Replaced Project Builder
• Organizes files
• Includes an editor
• Multiple testing targets
• Useful for iPhone, MAC
• Red link (app not build)

2
Interface Builder

• Works in collaboration with XCode
• Good for developing the App View
• Need to add keywords to the code
• IBOutlet translates to nothing
• IBAction translates to void
• Organized by category of usage

3
SDK Demo
4
Using the sensors

• Camera
• Microphone
• Proximity
• Accelerometer
• Magnetometer
• GPS
• Making calls
• Sending messages

5
Sensors on devices
6
Camera

• Use UIImagePickerController
• Implement UIImagePickerControllerDelegate
• UIImagePickerController picker
  UIImagePickerController alloc init
• picker.delegate pickerDelegate //can be self
• picker.sourceType UIImagePickerControllerSourceT
  ypeCamera
• Implement the following method in delegate
  (called after picture is taken)
• - (void)imagePickerController(UIImagePickerContro
  ller )picker didFinishPickingImage(UIImage
  )image editingInfo(NSDictionary )editingInfo

7
Microphone

• Core Audio library (AVAudioRecorder)
• NSURL url NSURL fileURLWithPath_at_"/dev/null"
  
• NSDictionary settings NSDictionary
  dictionaryWithObjectsAndKeys NSNumber
  numberWithFloat 44100.0, AVSampleRateKey,
  NSNumber numberWithInt kAudioFormatAppleLossless
  , AVFormatIDKey, NSNumber numberWithInt 1,
  AVNumberOfChannelsKey, NSNumber numberWithInt
  AVAudioQualityMax, AVEncoderAudioQualityKey,
  nil
• NSError error
• recorder AVAudioRecorder alloc
  initWithURLurl settingssettings errorerror
• if (recorder)
• recorder prepareToRecord
• recorder.meteringEnabled YES
• recorder record
• else NSLog(error description)

8
Proximity

• Turn them on
• UIDevice device UIDevice currentDevice
• device.proximityMonitoringEnabled YES
• BOOL state device.proximityState
• Set notifications
• NSNotificationCenter defaultCenter
  addObserver self
• selector _at_selector(proximityChanged)
• name _at_"UIDeviceProximityStateDidChangeNotificatio
  n"
• object device
• - (void) proximityChanged (NSNotification )note
  
• UIDevice device note object
• NSLog(_at_"In proximity i",
  device.proximityState)

9
Accelerometer

• Range is -0.5, 0.5
• Declare a class
• Start accelerometer
• Take measurements

10
Accelerometer (cont.)

• _at_interface AccelController UIViewControllerltUIAcc
  elerometerDelegategt
• UIAccelerometer accelerometer
• _at_end
• //start
• - (void)viewDidLoad
• accelerometer UIAccelerometer
  sharedAccelerometer
• accelerometer.updateInterval 0.1
• accelerometer.delegate self
• super viewDidLoad

11
Accelerometer (cont.)

• - (void)accelerometer(UIAccelerometer )meter
• didAccelerate(UIAcceleration
  )acceleration
• float x acceleration.x
• float y acceleration.y
• float z acceleration.z
• float angle atan2(y, x)
• ...

12
Magnetometer

• Core location, but available only for 3GS
• LocationManager CLLocationManager alloc
  init
• locationManager.delegate self
• if( locationManager.locationServicesEnabled
• locationManager.headingAvailable)
• locationManager startUpdatingLocation
• locationManager startUpdatingHeading
• else
• ...

13
Magnetometer (Delegate)

• - (void)locationManager(CLLocationManager )
  manager
• didUpdateHeading(CLHeading ) newHeading
• if (newHeading.headingAccuracy gt 0)
• CLLocationDirection theHeading
• newHeading.magneticHeading
• ...
• //to show calibration panel
• -(BOOL)locationManagerShouldDisplayHeadingCalibrat
  ion
• (CLLocationManager )manager
• return YES

14
GPS

• Core location
• locationManager CLLocationManager alloc
  init
• locationManager.delegate self
• if( locationManager.locationServicesEnabled )
• locationManager startUpdatingLocation
• else
• ...
• locationManager.desiredAccuracy
  kCLLocationAccuracyKilometer

15
GPS (Delegate methods)

• - (void)locationManager(CLLocationManager
  )manager didUpdateToLocation (CLLocation
  )newLocation fromLocation(CLLocation
  )oldLocation
• if( newLocation ! oldLocation )
• - (void)locationManager(CLLocationManager
  )manager didFailWithError (NSError )error

16
Making calls, Emails, and SMS

• Calls, emails, and SMS are treated like URL
  services (UIApplication.sharedApplication)
• UIApplication sharedApplication openURL
• NSURL URLWithString_at_"tel//123-456-7890"
• UIApplication sharedApplication openURLNSURL
  URLWithString_at_"mailtoemailAdress?subjecttestMai
  lbodyits test mail."
• UIApplication sharedApplication openURLNSURL
  URLWithString_at_"sms111"

17
App Examples

• Battery monitor
• LocateMe
• WhichWayIsUp
• Accerlerometer

18
References

• http//developer.apple.com/iphone
• http//www.learningiphoneprogramming.com/
• http//mobiforge.com/developing/story/deploying-ip
  hone-apps-real-devices
• http//www.wikipedia.org

19
Questions