MKMapView關閉位置服務

Question

我在我的應用程序中使用帶有「showsUserLocation」選項的MKMapView。我已經使用界面構建器添加了mapview，並在viewDidAppear和viewWillDissappear中設置了showUserLocation選項。

問題是從視圖返回或將應用程序置於後臺時。位置服務圖標不會消失。其實我必須刪除應用程序才能使其消失。即使我手動強制關閉應用程序，它仍然存在，如果我進入設置，它仍然在使用位置服務的應用程序列表中處於活動狀態。

我在下面添加了相關的代碼，我在這裏丟失了什麼？提前致謝！

的* .h：

#import <UIKit/UIKit.h> 
#import <MapKit/MapKit.h> 

@interface ***viewController: UIViewController { 
    IBOutlet MKMapView *theMapView; 
} 

@property (nonatomic, retain) MKMapView *theMapView; 
@end 

* .M

- (void)viewDidAppear:(BOOL)animated { 

     [super viewDidAppear:animated]; 

     theMapView.showsUserLocation = YES; 
    } 

    - (void)viewWillDisappear:(BOOL)animated { 
     [super viewWillDisappear:animated]; 

     theMapView.showsUserLocation = NO; 

    } 

- (void)dealloc { 
    [super dealloc]; 

    [theMapView release]; 
} 

Answer 1

我只是猜測，這可能不是解決它，但嘗試都將自自我聲明

即

- (void)viewDidAppear:(BOOL)animated { 

     [super viewDidAppear:animated]; 

     self.theMapView.showsUserLocation = YES; 
    } 

    - (void)viewWillDisappear:(BOOL)animated { 
     [super viewWillDisappear:animated]; 

     self.theMapView.showsUserLocation = NO; 

    } 

Answer 2

當應用進入和出來的背景，你可以註冊通知，並保存和恢復分別將用戶的位置狀態：

class MyVCWithAMap: UIViewController { 
    ... 
    // Track the state of the map user location property when going to background 
    var trackUserLocation = false 
    ... 
    deinit { 
     NSNotificationCenter.defaultCenter().removeObserver(self) 
    } 
    ... 
    override func viewDidLoad() { 
     super.viewDidLoad() 
     ... 
     // Register for notifications 
     NSNotificationCenter.defaultCenter().addObserver(self, selector:#selector(appEnteredForeground), name:UIApplicationWillEnterForegroundNotification, object: nil) 
     NSNotificationCenter.defaultCenter().addObserver(self, selector:#selector(appEnteredBackground), name:UIApplicationDidEnterBackgroundNotification, object: nil) 
    } 

    func appEnteredBackground() { 
     // Capture map user location state 
     viewModel.trackUserLocation = mapView.showsUserLocation    
     mapView.showsUserLocation = false 
    } 

    func appEnteredForeground() { 
     // Restore pre-snooze state 
     mapView.showsUserLocation = viewModel.trackUserLocation 
    } 

}