Ios 如何将MKMapView缩放到用户'；s当前位置

我正在尝试向用户当前位置显示mkmapview。它们将只显示城市名称。但它们并没有指定用户当前的确切位置。我想显示用户的确切位置。请告诉我如何缩放用户当前位置

GPSlocationAPPDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.locationManager=[[CLLocationManager alloc]init];
    if([CLLocationManager locationServicesEnabled])
    {
        self.locationManager.delegate=self;
        self.locationManager.distanceFilter=1;
        [self.locationManager startUpdatingLocation];
    }

    self.viewController = [[AnimationViewController alloc] initWithNibName:@"AnimationViewController" bundle:nil];
    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];
    return YES;
}
-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
    double miles=12.0;
    double scalingFactor= ABS( cos(2 * M_PI * newLocation.coordinate.latitude /360.0) );
    MKCoordinateSpan span;
    span.latitudeDelta=miles/69.0;
    span.longitudeDelta=miles/(scalingFactor*69.0);
    MKCoordinateRegion region;
    region.span=span;
    region.center=newLocation.coordinate;
    [self.viewController.mapView setRegion:region animated:YES];
    self.viewController.mapView.showsUserLocation=YES;      
}

---

获取用户位置的另一个选项是在viewDidLoad方法中将观察者添加到mapview，如下所示

-(void)viewDidLoad
{
    [super viewDidLoad]
    //register the observer
    [self.mapView.userLocation addObserver:self  
                                forKeyPath:@"location"  
                                   options:(NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld)  
                                   context:NULL];
}

无论这个观察家什么时候打电话，就这么做

- (void)observeValueForKeyPath:(NSString *)keyPath  
                  ofObject:(id)object  
                    change:(NSDictionary *)change  
                   context:(void *)context 
{
    MKCoordinateRegion region;
    region.center = self.mapView.userLocation.coordinate; 
    //Adjust span as you like
    MKCoordinateSpan span; 
    span.latitudeDelta  = 1; 
    span.longitudeDelta = 1; 
    region.span = span;

    [self.mapView setRegion:region animated:YES];
}

---

获取用户位置的另一个选项是在viewDidLoad方法中将观察者添加到mapview，如下所示

-(void)viewDidLoad
{
    [super viewDidLoad]
    //register the observer
    [self.mapView.userLocation addObserver:self  
                                forKeyPath:@"location"  
                                   options:(NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld)  
                                   context:NULL];
}

无论这个观察家什么时候打电话，就这么做

- (void)observeValueForKeyPath:(NSString *)keyPath  
                  ofObject:(id)object  
                    change:(NSDictionary *)change  
                   context:(void *)context 
{
    MKCoordinateRegion region;
    region.center = self.mapView.userLocation.coordinate; 
    //Adjust span as you like
    MKCoordinateSpan span; 
    span.latitudeDelta  = 1; 
    span.longitudeDelta = 1; 
    region.span = span;

    [self.mapView setRegion:region animated:YES];
}

---

您可以将

latitudeDelta

和

longitudeDelta

值设置为自定义缩放细节。增大表示缩放，减小表示缩小。

您可以设置

latitudeDelta

和

longitudeDelta

值以自定义缩放细节。增加表示缩放，减少表示缩小。

集合中的第一个

显示位置
视图中的
加载：
如下图所示

mapView.showsUserLocation = YES;

然后在
didUpdateToLocation:
中，用span设置区域，新位置如下所示

-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{
    MKCoordinateRegion region;
    region.center = newLocation.coordinate;
    MKCoordinateSpan span;
    span.latitudeDelta=0.04;
    span.longitudeDelta=0.04;

    region.span=span;  
    region.center = currentLocation; 
    [mapView setRegion:region animated:TRUE];
    [mapView regionThatFits:region]; // Set `regionThatFits:` with `region` like bellow...
}

集合中的第一个
在
视图中显示位置
加载：
如下图所示

mapView.showsUserLocation = YES;

然后在
didUpdateToLocation:
中，用span设置区域，新位置如下所示

-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{
    MKCoordinateRegion region;
    region.center = newLocation.coordinate;
    MKCoordinateSpan span;
    span.latitudeDelta=0.04;
    span.longitudeDelta=0.04;

    region.span=span;  
    region.center = currentLocation; 
    [mapView setRegion:region animated:TRUE];
    [mapView regionThatFits:region]; // Set `regionThatFits:` with `region` like bellow...
}

步骤：
1） 在视图中将出现

[self.mapView setMapType:MKMapTypeStandard];
[self.mapView setZoomEnabled:YES];
[self.mapView setScrollEnabled:YES];
[self.mapView setDelegate:self];
locationManager = [[CLLocationManager alloc] init] ;
BOOL locationAllowed = [CLLocationManager locationServicesEnabled];
if (locationAllowed == NO){
            //GPS DISABLED.
 }
 else{
 if(IS_IOS8_OR_LATER){
    [locationManager requestWhenInUseAuthorization];
    [locationManager requestAlwaysAuthorization];
}
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation]; 
}

2） 在viewController.h中声明MKCoordinateRegion

协调区域

3） 在didUpdateToLocation中：

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
 NSLog(@"current Latitude is %f",newLocation.coordinate.latitude);
 NSLog(@"current Longitude is %f",newLocation.coordinate.longitude);
 region.span.longitudeDelta  *= 0.05;
 region.span.latitudeDelta  *= 0.05;
 region.center.latitude = newLocation.coordinate.latitude;
 region.center.longitude = newLocation.coordinate.longitude;
 [self.mapView setRegion:region animated:YES];
 [locationManager stopUpdatingLocation];
}

步骤：
1） 在视图中将出现

[self.mapView setMapType:MKMapTypeStandard];
[self.mapView setZoomEnabled:YES];
[self.mapView setScrollEnabled:YES];
[self.mapView setDelegate:self];
locationManager = [[CLLocationManager alloc] init] ;
BOOL locationAllowed = [CLLocationManager locationServicesEnabled];
if (locationAllowed == NO){
            //GPS DISABLED.
 }
 else{
 if(IS_IOS8_OR_LATER){
    [locationManager requestWhenInUseAuthorization];
    [locationManager requestAlwaysAuthorization];
}
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation]; 
}

2） 在viewController.h中声明MKCoordinateRegion

协调区域

3） 在didUpdateToLocation中：

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
 NSLog(@"current Latitude is %f",newLocation.coordinate.latitude);
 NSLog(@"current Longitude is %f",newLocation.coordinate.longitude);
 region.span.longitudeDelta  *= 0.05;
 region.span.latitudeDelta  *= 0.05;
 region.center.latitude = newLocation.coordinate.latitude;
 region.center.longitude = newLocation.coordinate.longitude;
 [self.mapView setRegion:region animated:YES];
 [locationManager stopUpdatingLocation];
}

即使mapView的用户位置处于关闭状态，也可以进行更正和工作。即使mapView的用户位置处于关闭状态，也可以进行更正和工作。改进：您需要使用
CLLocationManagerDelegate
并侦听位置中的更改。在那里，您可以使用
newLocation
并更新到视图。改进：您需要使用
CLLocationManagerDelegate
并收听位置的更改。在那里，您可以使用
newLocation
并更新视图。