Mac上的iOS 7模拟器无法在自定义位置上使用(也无法征得许可) [英] iOS 7 Simulator on Mac doesn't work with custom location (Also doesn't ask permission)

问题描述

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，但是遇到了一些问题.每当我看到位置管理器所在的视图时，即使我设置了自定义位置(来自模拟器>调试>位置)，它也会打印出0.000000的纬度和经度.

I'm trying to make an iOS7 app that uses the current location of the device. I'm using the iPhone simulator on my Mac, but I'm having some problems. Every time my view that the location manager is in appears, it prints out 0.000000 for both latitude and longitude, even after I've set a custom location (from simulator>debug>location).

此外，当模拟器打开应用程序时，它并未请求使用当前位置的许可，这似乎很奇怪.有人知道这是怎么回事吗?

Also, it seemed strange that the simulator didn't ask for permission to use current location when it opened the app. Anybody know what's going on here?

- (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);
}

推荐答案

您需要从委托方法didUpdateLocationToLocation:fromLocation:中获取newLocation.还要实现didFailWithError委托方法.开始获取更新的位置需要花费一些时间，因此需要进行委托调用.

You need to get the newLocation from the delegate method didUpdateLocationToLocation:fromLocation:. Also implement didFailWithError delegate method. It takes some time before you start getting updated locations, hence the delegate call.

通常会缓存最后一个位置，因此检查位置的时间戳并过滤掉旧位置可能是明智的选择.

The last location is usually cached, so it maybe wise to check location's timestamp and filter the old location out.

这是我可以提供的最干净的示例.在Xcode中启动新项目，选择iPhone的Single View应用程序模板.不要触摸情节提要，只需将其替换为ViewController.m的内容并在Simulator或设备中运行即可.如果在Simulator上，请转到Debug并设置一些位置，您将在控制台中获得坐标.当视图在屏幕上或屏幕外时，我还将开始和停止位置更新.

This is the cleanest example I can provide. Start new project in Xcode, pick Single View application template, iPhone. Don't touch storyboard, just replace content of your ViewController.m with this and run in Simulator or device. If on Simulator, go to Debug and set some location and you will get coordinates in the console. I am also starting and stopping location updates when the view goes on or off screen.

#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

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