Dr Alasdair Allan - Learning iPhone Programming

32 Pages·2009·2.8 MB·English

The Sensors in your iPhone
Dr Alasdair Allan
Available Hardware
Hardware Original iPhone iPhone 1st Gen 2nd Gen 3rd Gen
Features iPhone 3G 3GS iPod touch iPod touch iPod touch
Cellular
Wi-Fi
Bluetooth
Speaker
Audio-In
Accelerometer
Magnetometer
GPS
Proximity Sensor
Camera
Video
Vibration
The GPS
(Core Location)
Core Location
•
Abstraction layer
•
Cell towers (12km falling to 1-3km)
•
Skyhook wireless (approx. 100m)
•
GPS (approx. 40m)
Core Location
LocationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
if( locationManager.locationServicesEnabled ) {
[locationManager startUpdatingLocation];
} else {
...
}
Distance filters
locationManager.distanceFilter = 1000; // 1km
Desired accuracy
locationManager.desiredAccuracy = kCLLocationAccuracyKilometer;
Delegate methods
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:
(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
if( newLocation != oldLocation ) {
...
}
}
- (void)locationManager:(CLLocationManager *)manager didFailWithError:
(NSError *)error {
...
}
The Accelerometer
+Y
Y
Z
+Z
X
+X