MapKit 给出错误的纬度和纬度 - iOS 8

Question

当我尝试在 iOS 8 中使用地图时，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.

For this I tried solution from here，但还是没有运气。

以下是我所做的。

步骤 1. 在 Info.plist 中有条目

NSLocationWhenInUseUsageDescription - This is test text

步骤 2. 更新 -(CLLocationCoordinate2D) getLocation

-(CLLocationCoordinate2D) getLocation{
    CLLocationManager *locationManager = [[[CLLocationManager alloc] init] autorelease];
    locationManager.delegate = self;
    locationManager.distanceFilter = kCLDistanceFilterNone;
    locationManager.desiredAccuracy = kCLLocationAccuracyBest;

    // this is change
    if(IS_OS_8_OR_LATER) {
        [locationManager requestWhenInUseAuthorization];
    }
    [locationManager startUpdatingLocation];


    CLLocation *location = [locationManager location];
    CLLocationCoordinate2D coordinate = [location coordinate];

    return coordinate;
}

步骤 3. Prefix.pch

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

步骤 4. 在 vi​​ewDidLoad 中再次删除应用程序。

CLLocationCoordinate2D theCoordinate;
theCoordinate = [self getLocation];

NSLog(@"ffffff===%f===%f", theCoordinate.latitude, theCoordinate.longitude);

我仍然得到输出为

ffffff===0.000===0.000

注意：

我收到警告，但这只是半秒钟然后消失，然后我收到消息

CLLocationCoordinate2D theCoordinate;
theCoordinate = [self getLocation];

NSLog(@"ffffff===%f===%f", theCoordinate.latitude, theCoordinate.longitude);

当我进入设置检查位置状态时，以下是我所拥有的。

知道为什么会这样吗？

我正在 iPad 2 iOS 8.0 和模拟器 iOS 8.0 上进行测试

Answer 1

是的！得到了解决方案，这是我的整个代码和添加的东西以使其正常工作。特别感谢@MBarton 的大力帮助。也感谢@Vinh Nguyen 投入宝贵的时间来解决我的问题。

在Target->General->Linked Frameworks & Libraries

下添加了Core Location Framework

添加到 .plist 文件中

NSLocationAlwaysUsageDescription

查看截图：

在我的ViewController.h

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <MapKit/MKAnnotation.h>

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

@interface ViewController : UIViewController  <MKMapViewDelegate,  CLLocationManagerDelegate>
{
    __weak IBOutlet UINavigationItem *navigationItem;
}

 @property (weak, nonatomic) IBOutlet MKMapView *mapView;
 @property(nonatomic, retain) CLLocationManager *locationManager;

@end

然后在ViewController.m

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController
@synthesize mapView;

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    [self setUpMap];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(void)setUpMap
{
    mapView.delegate = self;
    self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.delegate = self;
#ifdef __IPHONE_8_0
    if(IS_OS_8_OR_LATER) {
        // Use one or the other, not both. Depending on what you put in info.plist
        [self.locationManager requestAlwaysAuthorization];
    }
#endif
    [self.locationManager startUpdatingLocation];

    mapView.showsUserLocation = YES;
    [mapView setMapType:MKMapTypeStandard];
    [mapView setZoomEnabled:YES];
    [mapView setScrollEnabled:YES];
}

-(void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:YES];

    self.locationManager.distanceFilter = kCLDistanceFilterNone;
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    [self.locationManager startUpdatingLocation];
    NSLog(@"%@", [self deviceLocation]);

    //View Area
    MKCoordinateRegion region = { { 0.0, 0.0 }, { 0.0, 0.0 } };
    region.center.latitude = self.locationManager.location.coordinate.latitude;
    region.center.longitude = self.locationManager.location.coordinate.longitude;
    region.span.longitudeDelta = 0.005f;
    region.span.longitudeDelta = 0.005f;
    [mapView setRegion:region animated:YES];

}

- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
{
    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(userLocation.coordinate, 800, 800);
    [self.mapView setRegion:[self.mapView regionThatFits:region] animated:YES];
}
- (NSString *)deviceLocation {
    return [NSString stringWithFormat:@"latitude: %f longitude: %f", self.locationManager.location.coordinate.latitude, self.locationManager.location.coordinate.longitude];
}

噗……！自过去 5 天以来与许多代码战斗后得到了解决方案...

Referred from here

Answer 2

requestWhenInUseAuthorization 异步运行，因此在您的委托中的授权状态发生变化之前，您不应调用 startUpdatingLocation。

Answer 3

不确定什么是真正的问题，但将下面的代码放入viewDidLoad 解决问题。

mapView.delegate = self;
locationManager.delegate = self;
self.locationManager = [[CLLocationManager alloc] init];
#ifdef __IPHONE_8_0
if(IS_OS_8_OR_LATER) {
     // Use one or the other, not both. Depending on what you put in info.plist
    [self.locationManager requestWhenInUseAuthorization];
}
#endif
[self.locationManager startUpdatingLocation];

mapView.showsUserLocation = YES;
[mapView setMapType:MKMapTypeStandard];
[mapView setZoomEnabled:YES];
[mapView setScrollEnabled:YES];

Reference

Answer 4

您需要实现 CLLocationManager 委托 ( -(void) locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations ) 来获取位置更新。

这里有一个代码 sn-p 供你参考：

-(void) locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
     CLLocation *currentLocation = [locations lastObject];

     NSLog(@"ffffff===%f===%f", currentLocation.coordinate.latitude, currentLocation.coordinate.longitude);
}

或者，您可以实现 Mapkit 的以下委托方法：

- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
{
    MKUserLocation *myLocation = userLocation;
    NSLog(@"ffffff===%f===%f", myLocation.coordinate.latitude, myLocation.coordinate.longitude);
}