Core Location和MapKit的一些简单使用

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Core Location和MapKit的一些简单使用
Core Location

1. 基本对象是CLLocation，有属性coordinate, altitude, horizontal/vertical Accuracy, timestamp, speed, course

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typedef {

CLLocationDegrees latitude; // a double

CLLocationDegrees longitude; // a double

} CLLocationCoordinate2D; // 经纬度

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@property (readonly) CLLocationAccuracy horizontalAccuracy; // in meters

@property (readonly) CLLocationAccuracy verticalAccuracy;



kCLLocationAccuracyBestForNavigation;

kCLLocationAccuracyBest;

kCLLocationAccuracyNearestTenMeters;

kCLLocationAccuracyHundredMeters;

kCLLocationAccuracyKilometer;

kCLLocationAccuracyThreeKilometers;

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- (CLLocationDistance)distanceFromLocation:(CLLocation *)otherLocation; // in meters 两个位置之间的距离

2. 总是通过CLLocationManager来获取CLLocation（通过其代理），其一般的使用方法为：

（1）检查硬件是否支持你需要的位置更新

（2）创建一个CLLocationManager实例，并设置接收更新的代理对象

（3）根据你的需求对CLLocationManager进行配置

（4）启动CLLocationManager来监视改变。

3. Core Location Manager的一些设置

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@property CLLocationAccuracy desiredAccuracy; // always set this as low as possible

@property CLLocationDistance distanceFilter;



- (void)startUpdatingLocation;

- (void)stopUpdatingLocation;



- (void)startMonitoringSignificantLocationChanges;

- (void)stopMonitoringSignificantLocationChanges;

Core Location框架提供了三种用于追踪设备当前位置的服务

The significant-change location
service 提供了低耗电的方法来获取当前位置，当前位置改变时会发出通知

The standard location service 提供了一种可设置的方法来获取当前位置

Region monitoring 监视特定地区的跨越

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Listing 1 Starting the standard location service

- (void)startStandardUpdates

{

 // 创建location manager

 if (nil == locationManager)

 locationManager = [[CLLocationManager alloc] init];



 locationManager.delegate = self;



　　// 设置获取位置的精确度，越精确越耗电

 locationManager.desiredAccuracy = kCLLocationAccuracyKilometer;



 // 设置距离过滤器，超过次距离就更新一次位置

 locationManager.distanceFilter = 500;



 [locationManager startUpdatingLocation];

}

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Listing 2 Significant-Change Location Service



- (void)startSignificantChangeUpdates

{

 // Create the location manager if this object does not

 // already have one.

 if (nil == locationManager)

 locationManager = [[CLLocationManager alloc] init];



 locationManager.delegate = self;

 [locationManager startMonitoringSignificantLocationChanges];

}

4. 检查硬件

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+ (BOOL)locationServicesEnabled; // has the user enabled location monitoring in Settings?

+ (BOOL)headingAvailable; // can this hardware provide heading info (compass)?

+ (BOOL)significantLocationChangeMonitoringAvailable; // only if device has cellular?

+ (BOOL)regionMonitoringAvailable; // only certain iOS4 devices

+ (BOOL)regionMonitoringEnabled; // by the user in Settings

当程序初次使用位置服务时，会询问用户。可以提供一个string来描述使用目的。如果用户拒绝，则上面所有方法均返回NO

@property (copy) NSString *purpose

5. 获取位置更新

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// Delegate method from the CLLocationManagerDelegate protocol.

- (void)locationManager:(CLLocationManager *)manager

 didUpdateToLocation:(CLLocation *)newLocation

 fromLocation:(CLLocation *)oldLocation

{

 // If it's a relatively recent event, turn off updates to save power

 NSDate* eventDate = newLocation.timestamp;

 NSTimeInterval howRecent = [eventDate timeIntervalSinceNow];

 if (abs(howRecent) < 15.0)

 {

 NSLog(@"latitude %+.6f, longitude %+.6f ",

 newLocation.coordinate.latitude,

 newLocation.coordinate.longitude);

 }

 // else skip the event and process the next one.

}

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- (void)locationManager:(CLLocationManager *)manager

 didFailWithError:(NSError *)error;



typedef enum {

 kCLErrorLocationUnknown = 0,

 kCLErrorDenied, // 如果用户拒绝开启位置服务，那么应该停止location manager

 kCLErrorNetwork,

 kCLErrorHeadingFailure,

 kCLErrorRegionMonitoringDenied,

 kCLErrorRegionMonitoringFailure,

 kCLErrorRegionMonitoringSetupDelayed,

} CLError;

6. Geocoding Location Data

Geocoder对象使用网络服务来将经纬度转换为具体地址信息，iOS当前只支持经纬度转地址信息，不能将位置信息转换为经纬度

创建一个MKReverseGeocoder实例，设置代理，调用start方法。
代理会接受到 reverseGeocoder:didFindPlacemark:和reverseGeocoder:didFailWithError:

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@implementation MyGeocoderViewController (CustomGeocodingAdditions)

- (void)geocodeLocation:(CLLocation*)location forAnnotation:(MapLocation*)annotation

{

 MKReverseGeocoder* theGeocoder = [[MKReverseGeocoder alloc] initWithCoordinate:location.coordinate];



 theGeocoder.delegate = self;

 [theGeocoder start];

}



// Delegate methods

- (void)reverseGeocoder:(MKReverseGeocoder*)geocoder didFindPlacemark:(MKPlacemark*)place

{

 MapLocation* theAnnotation = [map annotationForCoordinate:place.coordinate];

 if (!theAnnotation)

 return;



 // Associate the placemark with the annotation.

 theAnnotation.placemark = place;



 // Add a More Info button to the annotation's view.

 MKPinAnnotationView* view = (MKPinAnnotationView*)[map viewForAnnotation:annotation];

 if (view && (view.rightCalloutAccessoryView == nil))

 {

 view.canShowCallout = YES;

 view.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];

 }

}



- (void)reverseGeocoder:(MKReverseGeocoder*)geocoder didFailWithError:(NSError*)error

{

 NSLog(@"Could not retrieve the specified place information. ");

}

@end



@implementation MKMapView (GeocoderAdditions)



- (MapLocation*)annotationForCoordinate:(CLLocationCoordinate2D)coord

{

 // Iterate through the map view's list of coordinates

 // and return the first one whose coordinate matches

 // the specified value exactly.

 id<MKAnnotation> theObj = nil;



 for (id obj in [self annotations])

 {

 if (([obj isKindOfClass:[MapLocation class]]))

 {

 MapLocation* anObj = (MapLocation*)obj;



 if ((anObj.coordinate.latitude == coord.latitude) &&

 (anObj.coordinate.longitude == coord.longitude))

 {

 theObj = anObj;

 break;

 }

 }

 }



 return theObj;

}

@end

MapKit
1. MKMapView 显示地图
2. 地图上可以显示注释（annotation），每个annotation由coordinate，title，subtitle构成，并由MKAnnotationView来显示

3. Annotation可以有一个callout，当annotation view被点击时显示，默认情况下只是显示title和subtitle，不过你可以添加左右accessory views

4. MKMapView显示一个遵守MKAnnotation协议的数组对象

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@property (readonly) NSArray *annotations; // contains id <MKAnnotation> objects

<pre name="code" class="plain">MKAnnotation protocol

@protocol MKAnnotation <NSObject>

@property (readonly) CLLocationCoordinate2D coordinate;

@optional

@property (readonly) NSString *title;

@property (readonly) NSString *subtitle;

@end

typedef {

 CLLocationDegrees latitude;

 CLLocationDegrees longitude;

} CLLocationCoordinate2D;</pre> 

 

<pre></pre>



<pre></pre>



5. 管理map view的annotations的方法



<pre name="code" class="plain">- (void)addAnnotation:(id <MKAnnotation>)annotation;

- (void)addAnnotations:(NSArray *)annotations;

- (void)removeAnnotation:(id <MKAnnotation>)annotation;

- (void)removeAnnotations:(NSArray *)annotations;</pre> 

6. MKMapView使用跟TableView类似的方法来重用annotation view



7. Annotations通过MKAnnotationView的子类显示在地图上，默认为MKPinAnnotationView 



8. 如果MKAnnotationView的canShowCallout设置为YES，那么点击会显示，同时会调用



<pre name="code" class="plain">- (void)mapView:(MKMapView *)sender didSelectAnnotationView:(MKAnnotationView *)aView;

//This is a great place to set up the MKAnnotationView‘s callout accessory views lazily.

</pre>



9. MKAnnotationViews的创建方法跟tableviewcell在tableview中的创建类似



<pre name="code" class="plain">- (MKAnnotationView *)mapView:(MKMapView *)sender

 viewForAnnotation:(id <MKAnnotation>)annotation

{

 MKAnnotationView *aView = [sender dequeueReusableAnnotationViewWithIdentifier:IDENT];

 if (!aView) {

 aView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation

 reuseIdentifier:IDENT];

 // set canShowCallout to YES and build aView’s callout accessory views here

 }

 aView.annotation = annotation; // yes, this happens twice if no dequeue

 // maybe load up accessory views here (if not too expensive)?

 // or reset them and wait until mapView:didSelectAnnotationView: to load actual data

 return aView;

}

</pre>



10. MKAnnotationView的一些属性



<pre name="code" class="plain">@property id <MKAnnotation> annotation; // the annotation; treat as if readonly

@property UIImage *image; // instead of the pin, for example

@property UIView *leftCalloutAccessoryView; // maybe a UIImageView

@property UIView *rightCalloutAccessoryView; // maybe a “disclosure” UIButton

@property BOOL enabled; // NO means it ignores touch events, no delegate method, no callout

@property CGPoint centerOffset; // where the “head of the pin” is relative to the image

@property BOOL draggable; // only works if the annotation implements setCoordinate:</pre> 

11. 如果你设置一个callout accessory view为一个UIControl





<pre name="code" class="plain">e.g. aView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];

The following MKMapViewDelegate method will get called when the accessory view is touched ...



- (void)mapView:(MKMapView *)sender

 annotationView:(MKAnnotationView *)aView

 calloutAccessoryControlTapped:(UIControl *)control;</pre> 

12. 使用一下代理方法来加载accessory views





<pre name="code" class="plain">-(void)mapView:(MKMapView *)sender didSelectAnnotationView:(MKAnnotationView *)aView

{

 if ([aView.leftCalloutAccessoryView isKindOfClass:[UIImageView class]]) {

 UIImageView *imageView = (UIImageView *)aView.leftCalloutAccessoryView;

 imageView.image = ...; // if you do this in a GCD queue, be careful, views are reused!

 }

}</pre>



13. 地图类型



<pre name="code" class="plain">@property MKMapType mapType;

<pre name="code" class="plain">enum {

 MKMapTypeStandard = 0,

 MKMapTypeSatellite,

 MKMapTypeHybrid

};

typedef NSUInteger MKMapType; </pre> 

<pre></pre>



<pre></pre>



14. 显示用户当前地址



<pre name="code" class="plain">@property BOOL showsUserLocation;

@property (readonly) BOOL isUserLocationVisible;

@property (readonly) MKUserLocation *userLocation;

MKUserLocation is an object which conforms to MKAnnotation which holds the user’s location.</pre> 

15.限制用户对地图的操作





<pre name="code" class="plain">@property BOOL zoomEnabled;

@property BOOL scrollEnabled;</pre> 

16. 控制地图的显示区域





<pre name="code" class="plain">@property MKCoordinateRegion region;

typedef struct {

 CLLocationCoordinate2D center;

 MKCoordinateSpan span;

} MKCoordinateRegion;



typedef struct {

 CLLocationDegrees latitudeDelta;

 CLLocationDegrees longitudeDelta;

}

- (void)setRegion:(MKCoordinateRegion)region animated:(BOOL)animated; // animate</pre>注意： 

你赋给region属性的值通常不是最终保存的值，在设置显示区域的时候同时也设置了缩放等级。map view不能显示任意的缩放等级，因此map view会选择一个能够尽可能显示你指定区域大小的缩放等级，然后根据此时显示的区域来保存。 

 

<pre name="code" class="plain">@property CLLocationCoordinate2D centerCoordinate;

- (void)setCenterCoordinate:(CLLocationCoordinate2D)center animated:(BOOL)animated;</pre> 

17. 地图载入通知





<pre name="code" class="plain">Remember that the maps are downloaded from Google earth.

- (void)mapViewWillStartLoadingMap:(MKMapView *)sender;

- (void)mapViewDidFinishLoadingMap:(MKMapView *)sender;

- (void)mapViewDidFailLoadingMap:(MKMapView *)sender withError:(NSError *)error;</pre>



18. 



 



 



 



 



 



 



 





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原文地址：https://www.cnblogs.com/Camier-myNiuer/p/3274847.html