Mac上的iOS 7模拟器不适用于自定义位置（也不要求权限）

Question

我正在尝试制作一个使用设备当前位置的iOS7应用。我在Mac上使用iPhone模拟器，但我遇到了一些问题。每当我看到位置管理器所在的视图时，即使在我设置了自定义位置（来自模拟器＆gt; debug＆gt;位置）之后，它也会打印出纬度和经度0.000000。

此外，模拟器在打开应用程序时没有要求使用当前位置的许可似乎很奇怪。有谁知道这里发生了什么？

- (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);
}

Answer 1

您需要从委托方法didUpdateLocationToLocation：fromLocation：获取newLocation。还实现了didFailWithError委托方法。在开始获取更新位置之前需要一些时间，因此委托调用。

最后一个位置通常是缓存的，因此检查位置的时间戳并过滤旧位置可能是明智的。

修改

这是我能提供的最干净的例子。在Xcode中启动新项目，选择单一视图应用程序模板，iPhone。不要触摸故事板，只需用此替换ViewController.m的内容，然后在模拟器或设备中运行。如果在Simulator上，转到Debug并设置一些位置，您将在控制台中获得坐标。我也在视图开启或关闭时启动和停止位置更新。

#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