Incorporate GeoJSON into Your Swift / iOS Map - Kodeco скачать в хорошем качестве

Incorporate GeoJSON into Your Swift / iOS Map - Kodeco

GeoJSON allows you to add rendering information to a map from regular JSON files. About the course: Level up your MapKit knowledge! Learn how to customize your maps by way of custom drawing. Discover the difference between an overlay and a renderer, and how you can use those components to expand the map by providing more information, or by creating an entirely map using your own map tiles. Course link: https://www.raywenderlich.com/1425535... - Join the Ray Wenderlich community here:   / discord   --- About MapKit: You use this class as-is to display map information and to manipulate the map contents from your application. You can center the map on a given coordinate, specify the size of the area you want to display, and annotate the map with custom information. When you initialize a map view, you specify the initial region for that map to display by setting the region property of the map. A region is defined by a center point and a horizontal and vertical distance, referred to as the span. The span defines how much of the map should be visible and is also how you set the zoom level. For example, specifying a large span results in the user seeing in a wide geographical area at a low zoom level, whereas specifying a small span results in a more narrow geographical area and a higher zoom level. In addition to setting the span programmatically, the MKMapView class supports many standard interactions for changing the position and zoom level of the map. In particular, map views support flick and pinch gestures for scrolling around the map and zooming in and out. Support for these gestures is enabled by default but can also be disabled using the isScrollEnabled and isZoomEnabled properties. You can also use projected map coordinates instead of regions to specify some values. When you project the curved surface of the globe onto a flat surface, you get a two-dimensional version of a map where longitude lines appear to be parallel. To specify locations and distances, you use the MKMapPoint, MKMapSize, and MKMapRect data types. Although you should not subclass the MKMapView class itself, you can get information about the map view’s behavior by providing a delegate object. The map view calls the methods of your custom delegate to let it know about changes in the map status and to coordinate the display of custom annotations, which are described in more detail in Annotating the Map. The delegate object can be any object in your application as long as it conforms to the MKMapViewDelegate protocol. For more information about implementing the delegate object, see MKMapViewDelegate. In macOS 10.14 and later, you can apply a light or dark appearance to your maps by modifying the appearance property of your map view (or one of its ancestor views). Even if you specify a custom appearance, users can use the Maps app to force all maps to adopt a light appearance. Use the map view's effectiveAppearance property to determine the actual appearance of your map. For information about how to set view appearances, see Choosing a Specific Appearance for Your macOS App. Annotating the Map The MKMapView class supports the ability to annotate the map with custom information. Because a map may have large numbers of annotations, map views differentiate between the annotation objects used to manage the annotation data and the view objects for presenting that data on the map. An annotation object is any object that conforms to the MKAnnotation protocol. Annotation objects are typically implemented using existing classes in your application’s data model. This allows you to manipulate the annotation data directly but still make it available to the map view. Each annotation object contains information about the annotation’s location on the map along with descriptive information that can be displayed in a callout. The presentation of annotation objects on the screen is handled by an annotation view, which is an instance of the MKAnnotationView class. An annotation view is responsible for presenting the annotation data in a way that makes sense. For example, the Maps application uses a marker icon to denote specific points of interest on a map. (The Map Kit framework offers the MKMarkerAnnotationView and MKPinAnnotationView classes for similar annotations in your own applications.) You could also create annotation views that cover larger portions of the map. Because annotation views are needed only when they are onscreen, the MKMapView class provides a mechanism for queueing annotation views that are not in use. Annotation views with a reuse identifier can be detached and queued internally by the map view when they move offscreen. This feature improves memory use by keeping only a small number of annotation views in memory at once and by recycling the views you do have. It also improves scrolling performance by alleviating the need to create new views while the map is scrolling.