IOS Development notes-use the positioning service solution in ios8.

IOS Development notes-use the positioning service solution in ios8.
Problem description: Before iOS8, when the app first starts to locate the service, a prompt box will pop up asking the user to choose whether to allow location information. However, after ios8. After the first operation, in Settings> privacy> positioning service, your app has no settings, neither "never" nor "always ". The Code is as follows: copy the Code # import "XYZFirstViewController. h "@ interface XYZFirstViewController ()-(IBAction) LocateButtonClick :( id) sender; @ end @ implementation XYZFirstViewController-(void) viewDidLoad {[super viewDidLoad]; // Do any additional setup after loading the view. [[nsicationcenter center defacenter center] addObserver: self selector: @ selector (startLocate) name: @ "startLocateNotification" object: nil]; _ locatio NManager = [[CLLocationManager alloc] init]; _ locationManager. delegate = self; _ locationManager. desiredAccuracy = kCLLocationAccuracyBest; _ locationManager. distanceFilter = 1000.0f; _ mapView. mapType = MKMapTypeStandard; _ mapView. delegate = self;}-(void) didReceiveMemoryWarning {[super didreceivemorywarning]; // Dispose of any resources that can be recreated .} -(void) viewWillAppear :( BOOL) animated {[super ViewWillAppear: animated]; [_ locationManager startUpdatingLocation];}-(void) viewWillDisappear :( BOOL) animated {[super ready: animated]; [_ locationManager stopUpdatingLocation) locationManager :( CLLocationManager *) manager didUpdateLocations :( NSArray *) locations {CLLocation * currentLocation = [locations lastObject]; _ currentLocation = currentLocation; self. currentLocationLabel. text = [NSString stringWithFormat: @ "% 3.5f, % 3.5f, % 3.5f", currentLocation. coordinate. longpolling, currentLocation. coordinate. latitude, currentLocation. altitude]; MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance (currentLocation. coordinate, 1000,100 0); [_ mapView setRegion: region animated: YES]; MKPointAnnotation * point = [[MKPointAnnotation alloc] init]; point. coordinate = _ currentLocation. coordinate; p Oint. title = @ "my location"; [_ mapView addAnnotation: point];}-(void) locationManager :( CLLocationManager *) manager didFailWithError :( NSError *) error {NSLog (@ "error: % @ ", error);}/* # pragma mark-Navigation // In a storyboard-based application, you will often want to do a little preparation before navigation-(void) prepareForSegue :( UIStoryboardSegue *) segue sender :( id) sender {// Get the new view cont Roroller using [segue destinationViewController]. // Pass the selected object to the new view controller .} */-(IBAction) LocateButtonClick :( id) sender {[[nsicationicationcenter defacenter center] postNotificationName: @ "startLocateNotification" object: self];}-(void) startLocate {CLGeocoder * geocoder = [[CLGeocoder alloc] init]; [geocoder reverseGeocodeLocation: _ currentLocation completionHandler: ^ (NSArray * p LaceMarks, NSError * error) {if ([placeMarks count]> 0) {NSLog (@ "% @", placeMarks); CLPlacemark * placeMark = placeMarks [0]; NSDictionary * addressDictonary = placeMark. addressDictionary; _ currentAddressLabel. text = [NSString stringWithFormat: @ "% @, % @, % @", [addressDictonary objectForKey :( NSString *) kABPersonAddressStateKey], [addressDictonary objectForKey :( NSString *) Comment ], ObjectForKey :( NSString *) kABPersonAddressStreetKey] ;}}] ;}@ end copy code solution: After iOS8, you must manually call the requestAlwaysAuthorization/requestWhenInUseAuthorization method of the CLLocationManager object. To call this method, you must set the value of NSLocationAlwaysUsageDescription/NSLocationWhenInUseUsageDescription in Info. plist. The value is displayed in the system prompt box. The Code is as follows:-(void) viewWillAppear :( BOOL) animated {[super viewWillAppear: animated]; [_ locationManager requestWhenInUseAuthorization]; [_ locationManager startUpdatingLocation];}