在IOS7中获取经度和纬度

Question

我正在开发一个使用定位服务并在后台运行的iPhone应用程序。此应用程序在IOS6上运行时会准确显示纬度和经度。但是如果我在IOS7上运行同一应用程序，则有时会显示纬度和经度，有时是-1和-1。 我不了解IOS7上的这种行为。 这种行为的原因可能是什么？

Answer 1

为了模拟位置，请选择iOS Simulator Debug-> Location菜单选项，然后选择预定义的位置或旅程之一（例如City Bicycle Ride）或Custom Location…，以输入特定的纬度和经度。

这段代码对我有用。

创建CLLocationManager对象

下一个任务是实现代码以创建CLLocationManager类的实例。 由于这需要在加载视图时发生，因此理想的位置是LocationViewController.m文件中视图控制器的viewDidLoad方法中：

- (void)viewDidLoad {
    [super viewDidLoad];
    _locationManager = [[CLLocationManager alloc] init];
    _locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    _locationManager.delegate = self;
    [_locationManager startUpdatingLocation];
    _startLocation = nil;
}

实施行动方法

-(void)resetDistance:(id)sender
{
        _startLocation = nil;
}

实现CLLocationManager方法

#pragma mark -
#pragma mark CLLocationManagerDelegate

-(void)locationManager:(CLLocationManager *)manager
   didUpdateToLocation:(CLLocation *)newLocation
                  fromLocation:(CLLocation *)oldLocation
{
     NSString *currentLatitude = [[NSString alloc] 
                  initWithFormat:@"%+.6f", 
                  newLocation.coordinate.latitude];
     _latitude.text = currentLatitude;

     NSString *currentLongitude = [[NSString alloc] 
          initWithFormat:@"%+.6f",
          newLocation.coordinate.longitude];
     _longitude.text = currentLongitude;

     NSString *currentHorizontalAccuracy = 
              [[NSString alloc] 
             initWithFormat:@"%+.6f",
             newLocation.horizontalAccuracy];
     _horizontalAccuracy.text = currentHorizontalAccuracy;

     NSString *currentAltitude = [[NSString alloc] 
                  initWithFormat:@"%+.6f",                                                          
                  newLocation.altitude];
     _altitude.text = currentAltitude;

     NSString *currentVerticalAccuracy = 
              [[NSString alloc] 
              initWithFormat:@"%+.6f",
              newLocation.verticalAccuracy];
     _verticalAccuracy.text = currentVerticalAccuracy;

     if (_startLocation == nil)
            _startLocation = newLocation;

     CLLocationDistance distanceBetween = [newLocation
            distanceFromLocation:_startLocation];

     NSString *tripString = [[NSString alloc] 
           initWithFormat:@"%f", 
           distanceBetween];
     _distance.text = tripString;
}

到底试试这个方法

尝试此方法以获得连续更新的纬度和经度

(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{  
    CLLocation *location_updated = [locations lastObject];   
    NSLog(@"updated coordinate are %@",location_updated);
}

Answer 2

使用此方法获取位置连续使用此方法

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

{
location_updated = [locations lastObject];    
NSLog(@"updated coordinate are %@",location_updated);

}

可能是您正在使用此方法

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

此方法已在iOS 6.0中弃用