March 2013
Intermediate to advanced
1000 pages
34h 51m
English
Content preview from Programming iOS 6, 3rd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Location
Core Location provides facilities for the device to determine and report its location (location services). It takes advantage of three sensors:
- Wi-Fi
- The device (if Wi-Fi is turned on) may scan for nearby Wi-Fi devices and compare these against an online database.
- Cell
- The device (if it has cell capabilities) may compare nearby telephone cell towers against an online database.
- GPS
- The device’s GPS (if it has one) may be able to obtain a position fix from GPS satellites.
Core Location will automatically use whatever facilities the device does have; all you have to do is ask for the device’s location. Core Location allows you to specify how accurate a position fix you want; more accurate fixes may require more time.
The notion of a location is encapsulated by the CLLocation class and its properties, which include:
-
coordinate - A CLLocationCoordinate2D; see Chapter 34.
-
altitude - A CLLocationDistance, which is a double representing a number of meters.
-
speed - A CLLocationSpeed, which is a double representing meters per second.
-
heading - A CLLocationDirection, which is a double representing degrees (not radians!) clockwise from north.
-
horizontalAccuracy - A CLLocationAccuracy, which is a double representing meters.
In addition to the sensor-related considerations I mentioned a moment ago, use of Core Location poses the following challenges:
- Accuracy of a reported location may vary depending on a number of factors. The GPS is the most accurate location sensor, but it takes ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.