Google Maps API：獲取當前位置的座標iOS

我目前在我的項目中使用Google Maps API。我正在設置默認的攝像頭/縮放到用戶的位置。我這樣做：Google Maps API：獲取當前位置的座標iOS

@implementation ViewController{ 

GMSMapView *mapView_; 

} 
@synthesize currentLatitude,currentLongitude; 

- (void)viewDidLoad 
{ 
[super viewDidLoad]; 
mapView_.settings.myLocationButton = YES; 
mapView_.myLocationEnabled = YES; 


} 
- (void)loadView{ 

CLLocation *myLocation = mapView_.myLocation; 

GMSMarker *marker = [[GMSMarker alloc] init]; 
marker.position = CLLocationCoordinate2DMake(myLocation.coordinate.latitude, myLocation.coordinate.longitude); 
marker.title = @"Current Location"; 
marker.map = mapView_; 
GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:myLocation.coordinate.latitude 
                 longitude:myLocation.coordinate.longitude 
                  zoom:6]; 
mapView_ = [GMSMapView mapWithFrame:CGRectZero camera:camera]; 

self.view = mapView_; 
    NSLog(@"%f, %f", myLocation.coordinate.latitude, myLocation.coordinate.longitude); 

}

但是，這是行不通的，因爲當我做

NSLog(@"%f, %f", myLocation.coordinate.latitude, myLocation.coordinate.longitude);

返回0，0，它不給當前的位置座標。我如何正確獲取用戶的座標？

來源

2013-06-12 Alexyuiop

這是什麼線做什麼？ CLLocation * myLocation = mapView_.myLocation; 要獲取當前位置，我們需要 1.添加CoreLocation框架 2.創建CLLocationManager的對象 CLLocationManager * locationManager = [[CLLocationManager alloc] init]; 3. [locationManager startUpdatingLocation]; CLLocation * location = [locationManager location]; CLLocationCoordinate2D coordinate = [位置座標]; –

谷歌地圖有一個功能，獲取用戶的位置，但我不知道如何得到它 – Alexyuiop

請參閱：http：// stackoverflow。問題/ 16331767 /如何獲取當前位置在谷歌地圖 - sdk在iphone中希望它有幫助 –

#import <CoreLocation/CoreLocation.h> 
@property(nonatomic,retain) CLLocationManager *locationManager;

- (NSString *)deviceLocation 
{ 
NSString *theLocation = [NSString stringWithFormat:@"latitude: %f longitude: %f", locationManager.location.coordinate.latitude, locationManager.location.coordinate.longitude]; 
return theLocation; 
} 

- (void)viewDidLoad 
{ 
    locationManager = [[CLLocationManager alloc] init]; 
    locationManager.distanceFilter = kCLDistanceFilterNone; 
    locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; // 100 m 
    [locationManager startUpdatingLocation]; 
}

回答here。

來源

2013-06-12 13:46:06 DrDev

點擊鏈接查看locationManager是什麼.. – DrDev

您需要在''viewDidLoad''自己的實現中調用''[super viewDidLoad]'' –

初始化後，您需要設置委託;否則，將無法正常工作。在Swift中：'locationManager.delegate = self'您需要符合'CLLocationManagerDelegate'委託並實現'func locationManager（manager：CLLocationManager，didUpdateLocations locations：[CLLocation]）{...}'。您可能還想停止更新某個位置的位置：'self.locationManager.stopUpdatingLocation（）' – oyalhi

當應用首次啓動時，它可能還不知道您的位置，因爲GPS設備通常需要一段時間才能鎖定到您的位置（如果它剛啓動），特別是如果這是第一次應用程序已經運行，所以用戶還沒有回答提示，讓應用程序訪問他們的位置。當地圖視圖剛剛創建時，mapView.myLocation似乎總是空的（無或有座標0,0）。

因此，您需要等待用戶的位置已知，然後更新相機位置。

一種方法可能是使用Puneet建議的how to get current location in google map sdk in iphone的代碼，但請注意，示例代碼中缺少設置位置管理器的詳細信息（如設置位置管理器的代理），這可能是爲什麼它沒有不適合你。

另一個選擇可能是使用上mapView.myLocation志願，如下所述：創建mapView之前，所以位置將永遠是零反正你的示例代碼about positioning myself,some problems

順便問一下，你正在訪問mapView.myLocation。

來源

2013-06-12 07:31:17

我剛剛下載了適用於iOS的新GoogleMap SDK演示。以下是我從源代碼中看到的「當前位置」是如何通過KVO實現的。

#if !defined(__has_feature) || !__has_feature(objc_arc) 
#error "This file requires ARC support." 
#endif 

#import "SDKDemos/Samples/MyLocationViewController.h" 

#import <GoogleMaps/GoogleMaps.h> 

@implementation MyLocationViewController { 
    GMSMapView *mapView_; 
    BOOL firstLocationUpdate_; 
} 

- (void)viewDidLoad { 
    [super viewDidLoad]; 
    GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:-33.868 
                  longitude:151.2086 
                   zoom:12]; 

    mapView_ = [GMSMapView mapWithFrame:CGRectZero camera:camera]; 
    mapView_.settings.compassButton = YES; 
    mapView_.settings.myLocationButton = YES; 

    // Listen to the myLocation property of GMSMapView. 
    [mapView_ addObserver:self 
      forKeyPath:@"myLocation" 
       options:NSKeyValueObservingOptionNew 
       context:NULL]; 

    self.view = mapView_; 

    // Ask for My Location data after the map has already been added to the UI. 
    dispatch_async(dispatch_get_main_queue(), ^{ 
    mapView_.myLocationEnabled = YES; 
    }); 
} 

- (void)dealloc { 
    [mapView_ removeObserver:self 
       forKeyPath:@"myLocation" 
        context:NULL]; 
} 

#pragma mark - KVO updates 

- (void)observeValueForKeyPath:(NSString *)keyPath 
         ofObject:(id)object 
         change:(NSDictionary *)change 
         context:(void *)context { 
    if (!firstLocationUpdate_) { 
    // If the first location update has not yet been recieved, then jump to that 
    // location. 
    firstLocationUpdate_ = YES; 
    CLLocation *location = [change objectForKey:NSKeyValueChangeNewKey]; 
    mapView_.camera = [GMSCameraPosition cameraWithTarget:location.coordinate 
                zoom:14]; 
    } 
} 

@end

希望它能幫助你。

來源

2015-08-31 13:41:14 TypingPanda

此方法相當長，如果我們使用CLLocation Manager，效果會更好。 –

以防萬一有人想DrDev的斯威夫特卡倫特3出色答卷：

var locationManager: CLLocationManager? 

func deviceLocation() -> String { 
    let theLocation: String = "latitude: \(locationManager.location.coordinate.latitude) longitude: \(locationManager.location.coordinate.longitude)" 
    return theLocation 
} 

func viewDidLoad() { 
    locationManager = CLLocationManager() 
    locationManager.distanceFilter = kCLDistanceFilterNone 
    locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters 
    // 100 m 
    locationManager.startUpdatingLocation() 
}

來源

2017-05-18 06:32:11 agrippa

Google Maps API：獲取當前位置的座標iOS

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