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10.4.3 An example using altitude
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Altitude is as easy to work with as longitude and latitude. It s another property that can be read from a CLLocation object. The biggest problem is that it isn t available to all users. The Simulator and the original iPhone don t support altitude. Apple suggests using the following code to determine whether altitude is unavailable:
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if (signbit(newLocation.verticalAccuracy)) {
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If its return is nonzero, you need to discontinue checking for altitude information. Even if a user has an iPhone 3G or 3GS or an iPad 3G, you must watch out for two other gotchas. First, altitude information can be 10 times more inaccurate than the rest of the location information. Adjust your desiredAccuracy accordingly. Second, remember that the Core Location information updates only when you move a certain distance, as determined by the distanceFilter, in a nonvertical direction. This means you need to allow the user to update the distance by hand rather than depending on automatic updates. Listing 10.4 repeats the techniques you used previously, applying them to altitude. It also shows another useful integration of user input with a slightly more complex program. As usual, its core objects are built in Interface Builder: three UILabels, one UITextField, two UIImageViews, and a UIActivityIndicatorView. The last is the most interesting, because you haven t seen it before; we ll talk about it in our quick discussion of the code. You should be able to pick out all of the objects other than the activity indicator in figure 10.5, which follows the code.
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All about Core Location
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Listing 10.4
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Keeping track of a mountain climb with your iPhone
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@implementation altitudeViewController - (void)viewDidLoad { destinationHeight.returnKeyType = UIReturnKeyDone; myLM = [[CLLocationManager alloc] init]; myLM.delegate = self; myLM.desiredAccuracy = kCLLocationAccuracyBest; savedDestinationHeight = 0; [super viewDidLoad]; } - (BOOL)textFieldShouldReturn:(UITextField *)textField { [textField resignFirstResponder]; return YES; Responds to } text field -(IBAction)changeDestination:(id)sender { savedDestinationHeight = [destinationHeight.text intValue]; [self resetGPS:sender]; } Requests -(IBAction)resetGPS:(id)sender { location if (savedDestinationHeight) { updates [myLM startUpdatingLocation]; [myActivity startAnimating]; Animates } activity icon } - (void)locationManager:(CLLocationManager *)manager Receives didUpdateToLocation:(CLLocation *)newLocation location update fromLocation:(CLLocation *)oldLocation {
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Shows if (savedDestinationHeight) { altitude failure if (signbit(newLocation.verticalAccuracy)) { heightLabel.text = [NSString stringWithString:@" m."]; } else { Reports altitude info int currentHeight = 395 ceil((float)newLocation.altitude/savedDestinationHeight * (401-65)); heightLabel.text = [NSString stringWithFormat:@"%6.2f m.", newLocation.altitude]; heightButton.center = CGPointMake(106,currentHeight); heightLabel.center = CGPointMake(220,currentHeight); } [myLM stopUpdatingLocation]; [myActivity stopAnimating]; }
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} ... @end
Much of this code combines two SDK elements that you ve already met: the flourishes necessary to make a UITextField work and the protocols you must follow to use a location manager. You can see both of these elements in the viewDidLoad: method, which sets up the text field s return key and then starts the location manager. Note that you don t start the location manager updating; you can t depend on it to update when you re measuring only vertical change, so it s best to have the user do it by hand.
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Positioning: accelerometers, location, and the compass
Figure 10.5 An altitude program measures how high you ve climbed on a mountain of your choice.
Next, you finish the text field s functionality with the textFieldShouldReturn: method, which you ve met before. This project contains two Interface Builder objects that can generate actions. When the text field is adjusted B, the project saves that destination height for future calculation and then updates the current height using the resetGPS: method. The latter method is also used when the Check Height button is pressed. Figure 10.5 shows these input devices for clarity. Note that resetGPS: does two things. First, it starts the location update C, which you turn on only for brief, one-time uses. In addition to being more appropriate for monitoring altitude, this also helps save energy. Second, it starts your activity indicator D. This object is created in Interface Builder, where you should mark it with the hidesWhenStopped property. Interface Builder also automatically hides the view so it doesn t appear when the program is loaded. As a result, there s nothing on the screen until you start the animation, at which time a little activity indicator appears and continues animating until it s stopped (which you ll see in a minute). The heavy lifting is done when the location manager reports back its information E. In this section, you check whether you re getting altitude information F. If
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