显示用户位置 Xcode 6 /IOS 8

Question

我已经更新到 Xcode 6（从 Xcode 5），现在我的应用程序不再工作了（我很自豪它在 IOS7 下工作）。我有这个“著名”的调试输出：

尝试在不提示位置授权的情况下启动 MapKit 位置更新。必须先调用 -[CLLocationManager requestWhenInUseAuthorization] 或 -[CLLocationManager requestAlwaysAuthorization]。

当然，我一直在谷歌搜索这条消息以找到解决方案，但似乎没有任何效果。所以我在征求你的意见。

这是我的头文件：

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>
#import "MapPoint.h"

#define kGOOGLE_API_KEY @"my google api"
#define kBgQueue dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)

@interface XYZViewController : UIViewController <MKMapViewDelegate,       CLLocationManagerDelegate>

{
CLLocationManager *locationManager;
CLLocationCoordinate2D currentCentre;
int currenDist;
BOOL firstLaunch;
}

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

@end

这是我的实现文件：

#import "XYZViewController.h"
#import "DetailViewController.h"

@interface XYZViewController ()

@end

@implementation XYZViewController

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

//Make this controller the delegate for the map view.
self.mapView.delegate = self;

// Ensure that you can view your own location in the map view.
[self.mapView setShowsUserLocation:YES];

//Instantiate a location object.
locationManager = [[CLLocationManager alloc] init];

//Make this controller the delegate for the location manager.
[locationManager setDelegate:self];

//Set some parameters for the location object.
[locationManager setDistanceFilter:kCLDistanceFilterNone];
[locationManager setDesiredAccuracy:kCLLocationAccuracyBest];

firstLaunch=YES;
}

Answer 1

您需要按照错误描述告诉您的操作，并添加对requestWhenInUseAuthorization 或requestAlwaysAuthorization 的调用。之前已经介绍过，即。 iOS alertview for location permission doesn't pop up

所需的更改可能如下所示：

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

  //Make this controller the delegate for the map view.
  self.mapView.delegate = self;


  //Instantiate a location object.
  locationManager = [[CLLocationManager alloc] init];

  //Make this controller the delegate for the location manager.
  [locationManager setDelegate:self];

  //Set some parameters for the location object.
  [locationManager setDistanceFilter:kCLDistanceFilterNone];
  [locationManager setDesiredAccuracy:kCLLocationAccuracyBest];

  // Request use on iOS 8
  if (floor(NSFoundationVersionNumber) <= NSFoundationVersionNumber_iOS_7_1) {
    // Ensure that you can view your own location in the map view.
    [self.mapView setShowsUserLocation:YES];
  } else {
    [locationManager requestWhenInUseAuthorization];
  }

  firstLaunch=YES;
}

- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status {
  if (status == kCLAuthorizationStatusAuthorizedWhenInUse) {
    // Ensure that you can view your own location in the map view.
    [self.mapView setShowsUserLocation:YES];
  }
}

上面的代码做一个版本检查（苹果推荐的方式），你也可以做一个功能检查，这样更干净，但有时会导致我自己的经验出现问题。

棘手的部分是您需要在应用程序 Info.plist 中提供您的使用说明。否则 UIAlert 将不会出现，您也不会获得许可。转到 xcode 中的项目/目标设置，单击“信息”选项卡。单击 + 按钮。对于键，输入NSLocationWhenInUseUsageDescription，值应该是描述您将如何使用用户位置的字符串。您还可以在“支持文件”下打开“Info.plist”文件。

我怀疑这就是为什么它还没有为你工作。