问题
How to program to show the GPS availability and Accuracy level in an iphone? and it has to wipe the previous lat, lon info in label.
回答1:
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/
回答2:
CLLocationManager has a method locationServicesEnabled to check if the service is enabled or not
[CLLocationManager locationServicesEnabled]
来源：https://stackoverflow.com/questions/5897204/show-gps-availability-and-accuracy-in-iphone-sdk