MKMapView learning notes

I. Basic knowledge most mainstream smartphones currently support GoogleMap, and map programs on mobile phones can indeed bring great convenience to our travel. Using the MapKit framework on the iPhone can easily display Google Maps and add tags on maps.

Ii. Details

1. MKMapView display

(1) Create MKMapView

CGRect rect = CGRectMake(0, 20, 320, 460);MKMapView *mapView = [[MKMapView alloc] initWithFrame:rect];

(2) set the longitude and latitude

CLLocationCoordinate2D theCoordinate;theCoordinate.latitude=24.148926;theCoordinate.longitude=120.715542;

(3) set the display range

MKCoordinateSpan theSpan;theSpan.latitudeDelta=0.1;theSpan.longitudeDelta=0.1;

(4) set the center and range of Map Display

MKCoordinateRegion theRegion;theRegion.center=theCoordinate;theRegion.span=theSpan;

(5) set the map display type and display by range

[mapView setMapType:MKMapTypeStandard];[mapView setRegion:theRegion];

After completing these steps, you can add mapView to the current view.

2. add annotation (1) and annotation-related classes and protocols (a) MKAnnotation Protocol Annotation on MKMapView. This Protocol must be implemented and has three attributes: coordinate, title, and subtitle, the coordinate attribute must be set. @ Property (nonatomic, readonly) CLLocationCoordinate2D coordinate (B) MKAnnotationView after setting Annotation, you can use this to display the Annotation on the map,

- (id)initWithAnnotation:(id <MKAnnotation>)annotation reuseIdentifier:(NSString *)reuseIdentifier

Its important attributes include @ property (nonatomic, retain) UIImage * image, which is a custom image labeled on a map.

@ Property (nonatomic) BOOL canShowCallout setting click to bring up the Annotation

@ Property (retain, nonatomic) UIView * rightCalloutAccessoryViewproperty (retain, nonatomic) UIView * leftCalloutAccessoryView is set to display the attached View after clicking the left and right sides of the annotation.

(C) MKPinAnnotationView

This is a pin display annotation, inherited from MKAnnotationView, and added two attributes @ property (nonatomic) MKPinAnnotationColor pinColor to set the color of the pin, which can be red, green, or purple.

@ Property (nonatomic) BOOL animatesDrop: Specifies whether the PIN is displayed as a falling animation.

(2) Add Annotation on the map step (a) create a class that implements the MKAnnotation protocol, and set its coordinate attribute in the class's initialization function (B) create Annotation (c) using the above method Add the created Annotation to MapView using the addAnnotation method (d) to implement MKMapViewDelegate proxy. In the proxy Function

-(MKAnnotationView *) mapView :( MKMapView *) mView viewForAnnotation :( id <MKAnnotation>) in annotation, the Annotation is marked on the map as MKPinAnnotationView or MKAnnotationView.