Mac 上的 iOS 7 模拟器无法使用自定义位置（也不请求许可）

我正在尝试制作一个使用设备当前位置的 iOS7 应用程序。我在 Mac 上使用 iPhone 模拟器，但遇到了一些问题。每次出现位置管理器所在的视图时，即使在我设置了自定义位置（从模拟器>调试>位置）之后，它也会打印出纬度和经度 0.000000 。

另外，模拟器在打开应用程序时没有请求使用当前位置的权限，这似乎很奇怪。有人知道这是怎么回事吗？

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [super viewDidLoad];
    CLLocationManager *locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = self;
    locationManager.distanceFilter = kCLDistanceFilterNone; // whenever we move
    locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; // 100 m
    [locationManager startUpdatingLocation];

    _location = [locationManager location];


    _coord.longitude = _location.coordinate.longitude;
    _coord.latitude = _location.coordinate.latitude;
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    _coord.longitude = _location.coordinate.longitude;
    _coord.latitude = _location.coordinate.latitude;
    printf("%f\n",self.coord.longitude);
    printf("%f\n",self.coord.latitude);
}

您需要从委托方法 didUpdateLocationToLocation:fromLocation: 获取 newLocation。还实现 didFailWithError 委托方法。您需要一些时间才能开始获取更新的位置，因此需要进行委托调用。

最后一个位置通常会被缓存，因此检查位置的时间戳并过滤掉旧位置可能是明智的做法。

Edit:

这是我能提供的最干净的例子。在 Xcode 中启动新项目，选择 Single View 应用程序模板、iPhone。不要触摸故事板，只需用它替换 ViewController.m 的内容并在模拟器或设备中运行。如果在模拟器上，转到“调试”并设置一些位置，您将在控制台中获得坐标。当视图出现或离开屏幕时，我还会开始和停止位置更新。

#import "ViewController.h"
#import <CoreLocation/CoreLocation.h>

@interface ViewController () <CLLocationManagerDelegate>

@property (strong, nonatomic) CLLocationManager *locationManager;

@end

@implementation ViewController

#pragma mark - Location Manager delegate methods

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {

    if ([newLocation.timestamp timeIntervalSinceNow] >= -300.0) {

        NSLog(@"updated location with latitude %f longitude %f", newLocation.coordinate.longitude, newLocation.coordinate.latitude);
    }
}

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

    [self.locationManager startUpdatingLocation];
}

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

    [self.locationManager stopUpdatingLocation];
}

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error     {
    if(error.code == kCLErrorDenied) {

        // alert user
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Access to location services is disabled"
                                                        message:@"You can turn Location Services on in Settings -> Privacy -> Location Services"
                                                       delegate:nil
                                              cancelButtonTitle:@"OK"
                                              otherButtonTitles:nil];
        [alertView show];

    } else if(error.code == kCLErrorLocationUnknown) {
        NSLog(@"Error: location unknown");
    } else {
        NSLog(@"Error retrieving location");
    }
}

#pragma mark - Location Manager getter

- (CLLocationManager *)locationManager
{
    if (!_locationManager) {
        _locationManager = [[CLLocationManager alloc] init];
        _locationManager.delegate = self;
        _locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters;
        _locationManager.distanceFilter = 60.0;
    }
    return _locationManager;
}

@end