Objective C locationManager 无法获取当前位置，总是返回 0

Posted 2023-03-05

【中文标题】Objective C locationManager 无法获取当前位置，总是返回 0

【英文标题】：Objective C locationManager cannot get current location, always returns 0

【发布时间】：2015-05-26 14:26:07

【问题描述】：

能否请您查看以下代码，它确实尝试使用代表的 locationManager，并尝试返回设备的当前位置。

但总是返回0（允许的位置权限）

.m

self.locationManager = [[CLLocationManager alloc] init];
self.locationManager.delegate = self;
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
self.locationManager.distanceFilter = kCLDistanceFilterNone;
[self.locationManager startUpdatingLocation];

if(IS_OS_8_OR_LATER) 
    [self.locationManager requestAlwaysAuthorization];



CLAuthorizationStatus status = [CLLocationManager authorizationStatus];

if (status == kCLAuthorizationStatusAuthorizedAlways) 
  // TODO: Handle status authorized always


 else if (status == kCLAuthorizationStatusNotDetermined) 
  // TODO: Handle status not determined


 else 
  // TODO: Handle other







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

  //NSLog(@"newLocation: %@", newLocation);



-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error

    //NSLog(@"Error: %@",[error description]);

info.plist

<key>NSLocationAlwaysUsageDescription</key>
<string>We would like to use your location.</string>
<key>NSLocationWhenInUseUsageDescription</key>
<string>We would like to use your location.</string>

【问题讨论】：

你对你的 locationManager 有强引用吗？

是 @property (strong, nonatomic) CLLocationManager *locationManager;在 .h 上声明

返回0是什么意思？

你在模拟器上运行吗？

didUpdateToLocation 已弃用，您应该改用 didUpdateLocations

【参考方案1】：

请尝试在 requestAlwaysAuthorization 之后调用 startUpdatingLocation。并使用下面的 didUpdateLocations 委托方法。

if(IS_OS_8_OR_LATER) 
    [self.locationManager requestAlwaysAuthorization];


[self.locationManager startUpdatingLocation];


- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations

        _currentLocation = [locations objectAtIndex:0]; 
        //do your stuff with the location

    

对于模拟器测试 - 选择模拟器并转到调试 -> 位置 -> Apple 或 City Run

对于设备测试如果您获得当前位置，请查看地图。有时设备由于在屋内而无法获取当前位置。