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iOS开发手记－iOS8中使用定位服务解决方案
问题描述：
在iOS8之前，app第一次开始定位服务时，系统会弹出一个提示框来让用户选择是否允许使用定位信息。但iOS8后，app将不会出现这个弹窗。第一次运行之后，在设置->隐私->定位服务中，你的app没有任何设置，既不是“永不”，也不是“始终”。
代码如下：
#import "XYZFirstViewController.h"@interface XYZFirstViewController ()- (IBAction)LocateButtonClick:(id)sender;@end@implementation XYZFirstViewController- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(startLocate) name:@"startLocateNotification" object:nil]; _locationManager=[[CLLocationManager alloc] init]; _locationManager.delegate=self; _locationManager.desiredAccuracy=kCLLocationAccuracyBest; _locationManager.distanceFilter=1000.0f; _mapView.mapType=MKMapTypeStandard; _mapView.delegate=self; }- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}-(void) viewWillAppear:(BOOL)animated{ [super viewWillAppear:animated]; [_locationManager startUpdatingLocation];}-(void) viewWillDisappear:(BOOL)animated{ [super viewWillDisappear:animated]; [_locationManager stopUpdatingLocation];}-(void) 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.longitude,currentLocation.coordinate.latitude,currentLocation.altitude]; MKCoordinateRegion region=MKCoordinateRegionMakeWithDistance(currentLocation.coordinate, 1000, 1000); [_mapView setRegion:region animated:YES]; MKPointAnnotation *point=[[MKPointAnnotation alloc] init]; point.coordinate=_currentLocation.coordinate; point.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 controller using [segue destinationViewController]. // Pass the selected object to the new view controller.}*/- (IBAction)LocateButtonClick:(id)sender { [[NSNotificationCenter defaultCenter] postNotificationName:@"startLocateNotification" object:self ];}-(void) startLocate{ CLGeocoder *geocoder=[[CLGeocoder alloc]init]; [geocoder reverseGeocodeLocation:_currentLocation completionHandler:^(NSArray *placeMarks, 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 *)kABPersonAddressCityKey],[addressDictonary objectForKey:(NSString *) kABPersonAddressStreetKey] ]; } }]; }@end
解决方案：
以上代码在iOS8之后需要手动调用CLLocationManager对象的requestAlwaysAuthorization／
requestWhenInUseAuthorization方法。 调用该方法需要在Info.plist中设置NSLocationAlwaysUsageDescription/NSLocationWhenInUseUsageDescription的值，这个值会显示在系统提示框中。
代码如下：
-(void) viewWillAppear:(BOOL)animated{ [super viewWillAppear:animated]; [_locationManager requestWhenInUseAuthorization]; [_locationManager startUpdatingLocation];}
info.plist设置如下：
允许效果：
iOS开发手记－iOS8中使用定位服务解决方案
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