iOS将ViewController和AppDelegate设置为CoreLocation模型类的侦听器

Question

如何设置AppDelegate和ViewController作为模型corelocation类的侦听器？什么是适当的设计选择？

我很想让模型类实现CoreLocation和位置更新。我猜这个班级应该是sharedSingleton，因为我的AppDelegate和ViewController希望访问它。

当我的viewController调用它时，我想要CLLocationManager使用startUpdatingLocation。

当应用程序进入后台时，我想使用startMonitoringSignificantLocationChanges监视AppDelegate中的位置更新。

我的问题是，我该如何设置模型类来处理这些不同类型的位置更新，以及通知ViewController或AppDelegate发现了新的位置？使用NSNotification？代表团似乎没有工作，因为它是一对一的关系。

感谢您了解如何进行设计的帮助。

谢谢！

Answer 1

您可以在AppDelagete中拥有locationManager。让应用程序委托为您处理所有应用程序的位置更新。

AppDelegate.h

@interface AppDelegate : NSObject <UIApplicationDelegate,CLLocationManagerDelegate...> { 
    ... 
    CLLocationManager* locationManager; 
    CLLocationCoordinate2D myLocation; 
    ... 
} 
@property(nonatomic) CLLocationCoordinate2D myLocation; 
... 
@end 

AppDelegate.m

@implementation AppDelegate 
- (void)applicationDidFinishLaunching:(UIApplication *)application 
{ 
    locationManager = [[CLLocationManager alloc] init]; 
    locationManager.delegate = self; 
    locationManager.distanceFilter = kCLDistanceFilterNone; // whenever we move 
    locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; // 100 m 
    [locationManager startUpdatingLocation]; 
    ... 
} 

- (void)applicationWillEnterForeground:(UIApplication *)application 
{ 
    locationManager.distanceFilter = kCLDistanceFilterNone; // whenever we move 
    locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; // 100 m 
    [locationManager startUpdatingLocation]; 
} 


- (void)applicationDidEnterBackground:(UIApplication *)application 
{ 
    [locationManager startMonitoringSignificantLocationChanges]; 
} 

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{ 
    myLocation = newLocation.coordinate; 
    [[NSNotificationCenter defaultCenter] postNotificationName:@"updateControlersThatNeedThisInfo" object:nil userInfo:nil]; 
} 

... 

在你的控制器：

ViewController.m

... 
- (void)viewDidAppear:(BOOL)animated 
{ 
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(yourFunction) name:@"updateControlersThatNeedThisInfo" object:nil]; 
} 

-(void)yourFunction{ 
    AppDelegate *app = [[UIApplication sharedApplication] delegate]; 
    CLLocation myLocation = app.myLocation; 
    if(app.applicationState == UIApplicationStateBackground) 
      //background code 
    else 
      //foreground code 
    ... 
}