Guides and Sample Code Developer Search Guides and Sample Code Getting the Heading and Course of a DeviceCore Location supports two different ways to get direction-related information:Devices with a magnetometer can report the direction in which a device is pointing, also known as its heading.Devices with GPS hardware can report the direction in which a device is moving, also known as its course.Heading and course information don’t represent the same information.The heading of a device reflects the actual orientation of the device relative to true north or magnetic north.The course of the device represents the direction of travel and doesn’t take into account the device orientation.Depending on your app, you might prefer one type of information over the other or use a combination of the two.For example, a navigation app might toggle between course and heading information depending on the user’s current speed.At walking speeds, heading information would be more useful for orienting the user to the current environment, whereas in a car, course information provides the general direction of the car’s movement.

Adding a Requirement for Direction-Related EventsIf your iOS app requires direction-related information in order to function properly, include the UIRequiredDeviceCapabilities key in the app’s Info.plist file.This key contains an array of strings indicating the features that your app requires of the underlying iOS-based device.ios packet captureThe App Store uses this information to prevent users from installing apps on a device without the minimum required hardware.ios store enumFor direction-related events, you can associate two relevant strings with the UIRequiredDeviceCapabilities key: magnetometer—Include this string if your app requires heading information.gps—Include this string if your app requires course-related information.In both cases, also include the location-services string in the array.ios upgrade cost

For more information about the UIRequiredDeviceCapabilities key, see Information Property List Key Reference.Getting Heading-Related EventsHeading events are available to apps running on a device that contains a magnetometer.relion vaporizer walmartA magnetometer measures nearby magnetic fields emanating from the Earth and uses them to determine the precise orientation of the device.vicks vaporizer nz buyAlthough a magnetometer can be affected by local magnetic fields, such as those emanating from fixed magnets found in audio speakers, motors, and many other types of electronic devices, Core Location is smart enough to filter out fields that move with the device.best vaporizer mods 2015Heading values can be reported relative either to magnetic north or true north on the map.ios outlook review

Magnetic north represents the point on the Earth’s surface from which the planet’s magnetic field emanates.This location is not the same as the North Pole, which represents true north.Depending on the location of the device, magnetic north may be good enough for many purposes, but the closer to the poles you get, the less useful this value becomes.To get heading events: Create a CLLocationManager object.Determine whether heading events are available by calling the headingAvailable class method.Assign a delegate to the location manager object.If you want true north values, start location services.Call the startUpdatingHeading method to begin the delivery of heading events.qos of serviceListing 3-1 shows a custom method that configures a location manager and starts the delivery of heading events.ios online djIn this case, the object is a view controller that displays the current heading to the user.

Because the view controller displays the true north heading value, it starts location updates in addition to heading updates.Listing 3-1  Initiating the delivery of heading events }The object you assign to the delegate property must conform to the CLLocationManagerDelegate protocol.When a new heading event arrives, the location manager object calls the locationManager:didUpdateHeading: method to deliver that event to your app.Upon receiving a new event, check the headingAccuracy property to ensure that the data you just received is valid, as shown in Listing 3-2.In addition, if you are using the true heading value, also check whether it contains a valid value before using it.Listing 3-2  Processing heading events }Getting Course Information While the User Is MovingDevices that include GPS hardware can generate information that represents the device’s current course and speed.Course information indicates the direction in which the device is moving and doesn’t necessarily reflect the orientation of the device itself.

As a result, course information is primarily intended for apps that provide navigation information while the user is moving.The actual course and speed information is returned to your app in the same CLLocation objects you use to get the user’s position.When you start location updates, Core Location automatically provides course and speed information when it’s available.The framework uses the incoming location events to compute the current direction of motion.For more information on how to start location updates, see Getting the User’s Location.Copyright © 2016 Apple Inc.Terms of Use | Privacy Policy | Updated: 2016-03-21 How helpful is this document?* Very helpful Somewhat helpful Not helpful How can we improve this document?Fix typos or links Fix incorrect information Add or update code samples Add or update illustrations Add information about... * * Required information To submit a product bug or enhancement request, please visit the Bug Reporter page.