Geolocation in iOS: Mobile Positioning and Mapping on iPhone by Alasdair Allan

By Alasdair Allan

Benefit from iPhone and iPad sensors and complicated geolocation applied sciences to construct state of the art position functions. during this concise hands-on consultant, writer Alasdair Allan takes you deep inside of Apple's center situation framework, Map equipment, and different iOS instruments, utilizing illustrative examples and pattern Objective-C code. how to construct location-aware apps for either iPhones and iPads, utilizing code that detects beneficial properties after which adjusts your app's habit. in case you are a programmer with iOS adventure, or a Mac developer accustomed to Objective-C, this publication is helping you get off to a superior begin in location-based app improvement.

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For example, 1 degree of longitude spans a distance of about 69 miles at the equator but shrinks to 0 at the poles. However, unlike longitudinal distances that vary based on the latitude, 1 degree of latitude is always about 69 miles (ignoring variations due to the slightly ellipsoidal shape of the Earth). The length of 1 degree of Longitude (in miles) equals the cosine of the latitude × 69 miles. Click the Build and Run button on the Xcode toolbar to compile and deploy the application into the iPhone Simulator.

Changes in heading of less than this amount will not generate an update message to the delegate. headingFilter = 5; // 5 degrees The default value of this property is kCLHeadingFilterNone. You should use this value if you want to be notified of all heading updates. I’m going to leave the filter set to the default value. headingFilter = 5; // 5 degrees } else { ... code ...

The panel will remain visible until calibration is complete or until you dismiss it by calling the dismissHea dingCalibrationDisplay: method in the CLLocationManager class. info Figure 4-2. The heading calibration panel Writing a Compass Application Let’s go ahead and implement a simple view-based application to illustrate how to use the magnetometer. Open Xcode and start a new iPhone project, select a View-based Application template, and name the project “Compass” when prompted for a filename.

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