Ios 当前位置不会在真实设备上更新

我是iOS开发新手。我的问题是，当我想尝试在真实设备上获取当前位置，但该位置不起作用时，会出现以下错误：

Trying to start MapKit location updates without prompting for location authorization. Must call -[CLLocationManager requestWhenInUseAuthorization] or -[CLLocationManager requestAlwaysAuthorization] first.

我使用的是Xcode 6.2，源代码如下：

////.h

#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>

@protocol LocationViewDelegate <NSObject>

-(void)sendLocationLatitude:(double)latitude
                  longitude:(double)longitude
                 andAddress:(NSString *)address;
@end

@interface HomeViewController : UIViewController

@property (nonatomic, assign) id<LocationViewDelegate> delegate;

- (instancetype)initWithLocation:(CLLocationCoordinate2D)locationCoordinate;
@end

////.m
#import "HomeViewController.h"
#import "anotation.h"
#import <MapKit/MapKit.h>
#import "LocationViewController.h"

//In ViewDidLoad

#define IS_OS_8_OR_LATER ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)

static LocationViewController *defaultLocation = nil;

@interface HomeViewController () <MKMapViewDelegate,CLLocationManagerDelegate> {

    CLLocationManager *locationManager;
    MKMapView *_mapView;
    MKPointAnnotation *_annotation;

    CLLocationCoordinate2D _currentLocationCoordinate;
    BOOL _isSendLocation;
}

@property (strong, nonatomic) NSString *addressString;
@end

@implementation HomeViewController

@synthesize addressString = _addressString;

- (instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        _isSendLocation = YES;
    }

    return self;
}

- (instancetype)initWithLocation:(CLLocationCoordinate2D)locationCoordinate {
    self = [super initWithNibName:nil bundle:nil];
    if (self) {
        _isSendLocation = NO;
        _currentLocationCoordinate = locationCoordinate;
    }

    return self;
}

- (void)viewDidLoad {
    [super viewDidLoad];

    locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = self;

    float fOSVersion=[[[UIDevice currentDevice] systemVersion] floatValue];

    if(fOSVersion>=8.0) {

        [locationManager requestAlwaysAuthorization];
        CLAuthorizationStatus status = [CLLocationManager authorizationStatus];
        if (status == kCLAuthorizationStatusNotDetermined) {
            [locationManager requestWhenInUseAuthorization];
        } else {
            [locationManager startUpdatingLocation];
        }
    }

    UIButton *backButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 100, 44)];
    [backButton setImage:[UIImage imageNamed:@"back.png"] forState:UIControlStateNormal];

    // [backButton setTitle:NSLocalizedString(@"back", @"") forState:UIControlStateNormal];
    [backButton addTarget:self.navigationController action:@selector(popViewControllerAnimated:) forControlEvents:UIControlEventTouchUpInside];

    UIView *backButtonView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 63, 33)];
    //  backButtonView.backgroundColor=[UIColor whiteColor];
    backButtonView.bounds = CGRectOffset(backButtonView.bounds, 45, 5);
    [backButtonView addSubview:backButton];

    UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithCustomView:backButtonView];

    [self.navigationItem setLeftBarButtonItem:backItem];

    _mapView = [[MKMapView alloc] initWithFrame:self.view.bounds];
    _mapView.delegate = self;
    _mapView.mapType = MKMapTypeStandard;
    _mapView.zoomEnabled = YES;
    [self.view addSubview:_mapView];

    if (_isSendLocation) {
        _mapView.showsUserLocation = YES;//显示当前位置

        UIButton *sendButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 60, 44)];
        UIView *avatarButtonView = [[UIView alloc] initWithFrame:CGRectMake(290, 0, 63, 33)];
        [sendButton setTitle:@"发送" forState:UIControlStateNormal];

        [sendButton setTitleColor:[UIColor whiteColor]forState:UIControlStateNormal];

        [sendButton addTarget:self action:@selector(sendLocation) forControlEvents:UIControlEventTouchUpInside];

        //avatarButtonView.backgroundColor=[UIColor whiteColor];
        avatarButtonView.bounds = CGRectOffset(avatarButtonView.bounds, -25, 5);
        [avatarButtonView addSubview:sendButton];

        UIBarButtonItem *avatarItem = [[UIBarButtonItem alloc] initWithCustomView:avatarButtonView];
        [self.navigationItem setRightBarButtonItem:avatarItem];
        //        self.navigationItem.rightBarButtonItem.enabled = ;

        [self startLocation];
    }
    else {

        [self removeToLocation:_currentLocationCoordinate];
    }   
}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


#pragma marks StatusBar
- (UIStatusBarStyle)preferredStatusBarStyle {

    return UIStatusBarStyleLightContent;
}

- (BOOL)prefersStatusBarHidden {
    return NO;
}

-(void)viewWillAppear:(BOOL)animated {

    [super viewWillAppear:animated];
    [self.navigationController setNavigationBarHidden:NO];
}

-(void)viewWillDisappear:(BOOL)animated {

    [super viewWillDisappear:animated];
}

#pragma mark - class methods

+ (instancetype)defaultLocation {

    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        defaultLocation = [[LocationViewController alloc] initWithNibName:nil bundle:nil];
    });

    return defaultLocation;
}

#pragma mark - MKMapViewDelegate

- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation {

    __weak typeof(self) weakSelf = self;
    CLGeocoder *geocoder = [[CLGeocoder alloc] init];
    [geocoder reverseGeocodeLocation:userLocation.location completionHandler:^(NSArray *array, NSError *error) {
        if (!error && array.count > 0) {
            CLPlacemark *placemark = [array objectAtIndex:0];
            weakSelf.addressString = placemark.name;

            [self removeToLocation:userLocation.coordinate];
        }
    }];
}

- (void)mapView:(MKMapView *)mapView didFailToLocateUserWithError:(NSError *)error
{
}

#pragma mark - public

- (void)startLocation {

    if (_isSendLocation) {

        self.navigationItem.rightBarButtonItem.enabled = NO;
    }
}

-(void)createAnnotationWithCoords:(CLLocationCoordinate2D)coords {

    if (_annotation == nil) {
        _annotation = [[MKPointAnnotation alloc] init];
    }
    else{
        [_mapView removeAnnotation:_annotation];
    }
    _annotation.coordinate = coords;
    [_mapView addAnnotation:_annotation];
}

- (void)removeToLocation:(CLLocationCoordinate2D)locationCoordinate {

    _currentLocationCoordinate = locationCoordinate;
    float zoomLevel = 0.01;
    MKCoordinateRegion region = MKCoordinateRegionMake(_currentLocationCoordinate, MKCoordinateSpanMake(zoomLevel, zoomLevel));
    [_mapView setRegion:[_mapView regionThatFits:region] animated:YES];

    if (_isSendLocation) {
        self.navigationItem.rightBarButtonItem.enabled = YES;
    }

    [self createAnnotationWithCoords:_currentLocationCoordinate];
}

- (void)sendLocation {

    if (_delegate && [_delegate respondsToSelector:@selector(sendLocationLatitude:longitude:andAddress:)]) {
        [_delegate sendLocationLatitude:_currentLocationCoordinate.latitude longitude:_currentLocationCoordinate.longitude andAddress:_addressString];
    }

    [self.navigationController popViewControllerAnimated:YES];
}

- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status {

    if (status != kCLAuthorizationStatusNotDetermined) {
        [locationManager startUpdatingLocation];
    }
}
@end

//.h
#进口
#进口
@协议位置ViewDelegate
-（无效）发送位置纬度：（双）纬度
经度：（双）经度
andAddress：（NSString*）地址；
@结束
@接口HomeViewController:UIViewController
@属性（非原子，赋值）id委托；
-（instancetype）initWithLocation:（CLLocationCoordinate2D）locationCoordinate；
@结束
////m
#导入“HomeViewController.h”
#导入“anotation.h”
#进口
#导入“LocationViewController.h”
//在ViewDidLoad中
#定义为8或更高版本（[[[UIDevice currentDevice]systemVersion]floatValue]>=8.0）
静态位置ViewController*默认位置=零；
@接口HomeViewController（）{
CLLocationManager*locationManager；
MKMapView*\u mapView；
MKPointAnnotation*_注释；
CLLocationCoordinate2D_currentLocationCoordinate；
布尔伊森德定位；
}
@属性（强，非原子）NSString*addressString；
@结束
@HomeViewController的实现
@合成addressString=\u addressString；
-（instancetype）initWithNibName:（NSString*）nibNameOrNil bundle:（NSBundle*）nibBundleOrNil{
self=[super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]；
如果（自我）{
_isSendLocation=是；
}
回归自我；
}
-（instancetype）initWithLocation:（CLLocationCoordinate2D）locationCoordinate{
self=[super initWithNibName:nil bundle:nil]；
如果（自我）{
_isSendLocation=否；
_currentLocationCoordinate=位置坐标；
}
回归自我；
}
-（无效）viewDidLoad{
[超级视图下载]；
locationManager=[[CLLocationManager alloc]init]；
locationManager.delegate=self；
浮动fOSVersion=[[[UIDevice currentDevice]系统版本]浮动值]；
如果（fOSVersion>=8.0）{
[locationManager请求始终授权]；
CLAuthorizationStatus=[CLLocationManager授权状态]；
如果（状态==kCLAuthorizationStatusNotDetermined）{
[locationManager请求使用授权]；
}否则{
[locationManager startUpdatingLocation]；
}
}
UIButton*backButton=[[UIButton alloc]initWithFrame:CGRectMake（0,0,100,44）]；
[backButton setImage:[UIImage ImageName:@“back.png”]用于状态：UIControlStateNormal]；
//[backButton设置标题：NSLocalizedString（@“back”，@“”）用于状态：UIControlStateNormal]；
[backButton addTarget:self.navigationController操作：@selector（popViewControllerAnimated:）for ControlEvents:UIControlEventTouchUpInside]；
UIView*backButtonView=[[UIView alloc]initWithFrame:CGRectMake（0,0,63,33）]；
//backButtonView.backgroundColor=[UIColor whiteColor]；
backButtonView.bounds=CGRectOffset（backButtonView.bounds，45,5）；
[backButtonView添加子视图：backButton]；
UIBarButtonItem*backItem=[[UIBarButtonItem alloc]initWithCustomView:backButtonView]；
[self.navigationItem setLeftBarButtonItem:backItem]；
_mapView=[[MKMapView alloc]initWithFrame:self.view.bounds]；
_mapView.delegate=self；
_mapView.mapType=MKMapTypeStandard；
_mapView.ZoomeEnabled=是；
[self.view addSubview:_mapView]；
如果（_isSendLocation）{
_mapView.showsUserLocation=是//显示当前位置
UIButton*sendButton=[[UIButton alloc]initWithFrame:CGRectMake（0,0,60,44）]；
UIView*avatarButtonView=[[UIView alloc]initWithFrame:CGRectMake（290,0,63,33）]；
[发送按钮设置标题：@”发送" forState:uicontrol状态正常]；
[sendButton setTitleColor:[UIColor whiteColor]用于状态：UIControlStateNormal]；
[sendButton添加目标：自我操作：@selector（sendLocation）for ControlEvents:UIControlEventTouchUpInside]；
//avatarButtonView.backgroundColor=[UIColor-whiteColor]；
avatarButtonView.bounds=CGRectOffset（avatarButtonView.bounds，-25,5）；
[虚拟按钮视图添加子视图：发送按钮]；
UIBarButtonItem*avatarItem=[[UIBarButtonItem alloc]initWithCustomView:avatarButtonView]；
[self.navigationItem setRightBarButtonItem:avatarItem]；
//self.navigationItem.rightBarButtonItem.enabled=；
[自我震惊]；
}
否则{
[自移除颜色：_currentLocationCoordinate]；
}   
}
-（无效）未收到记忆警告{
[超级记忆警告]；
//处置所有可以重新创建的资源。
}
#pragma标记状态栏
-（UIStatusBarStyle）首选状态BarStyle{
返回UIStatusBarStyleLightContent；
}
-（BOOL）更喜欢StatusBarHidden{
返回否；
}
-（无效）视图将显示：（BOOL）动画{
[超级视图将显示：动画]；
[self.navigationController设置NavigationBarHidden:否]；
}
-（无效）视图将消失：（BOOL）已设置动画{
[超级视图将消失：动画]；
}
#pragma标记类方法
+（instancetype）默认位置{
静态调度一次；
一次发送（一次发送）^{
defaultLocation=[[LocationViewController alloc]initWithNibName:nil bundle:nil]；
});
返回默认位置；
}
#pragma标记-MKMapViewDelegate
-（void）mapView:（MKMapView*）mapView didUpdateUserLocation:（MKUserLocation*）userLocation{
__弱类型（自我）弱自我=自我；
CLGeocoder*geocoder=[[CLGeocoder alloc]init]；
[geocoder reverseGeocodeLocation:userLocation.location completionHandler:^（NSArray*数组，NSError*错误）{
如果（！error&&array.count>0）{
CLPlacemark*placemark=[array objectAtIndex:0]；
weakSelf.addressString=placemark.name；
[self-removeToLocation:userLocation.coordinate]；
}
}];
}
-（void）mapView:（MKMapView*）mapView未能定位错误：（n错误*）错误
{
}
#布拉格马克-公共
-（空）惊吓{
如果（_isSendLocation）{
自助导航
 if (status != kCLAuthorizationStatusNotDetermined) {
        [locationManager startUpdatingLocation];
    }

if (status == kCLAuthorizationStatusAuthorized) {
            [locationManager startUpdatingLocation];
        }

CLAuthorizationStatus status = [CLLocationManager authorizationStatus];
    if (status == kCLAuthorizationStatusNotDetermined) {
        [locationManager requestWhenInUseAuthorization];
    } else {
        [locationManager startUpdatingLocation];
    }