Show GPS availability and Accuracy in Iphone SDK

How to pro开发者_Python百科gram to show the GPS availability and Accuracy level in an iphone? and it has to wipe the previous lat, lon info in label.

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There is a class in iOS sdk called CLLocationManager. Go though its documentation in the XCode or look for some sample example.
http://mobileorchard.com/hello-there-a-corelocation-tutorial/

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CLLocationManager has a method locationServicesEnabled to check if the service is enabled or not

[CLLocationManager locationServicesEnabled]