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iOS 发布时间：2022-03-30 发布网站：大佬教程 code.js-code.com

大佬教程收集整理的这篇文章主要介绍了ios – 在MapKit中沿弧线为可视元素设置动画，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。

如何在arckit中创建的弧形视觉元素添加动画和动画？

以下代码将在两点之间创建一个漂亮的弧.想象一下,动画视觉将代表沿着这条弧线飞行的飞机.

@H_489_9@-(void)addArc { CLLOCATIOnCoordinate2D sanFrancisco = { 37.774929,-122.419416 }; CLLOCATIOnCoordinate2D newYork = { 40.714353,-74.005973 }; CLLOCATIOnCoordinate2D pointsArc[] = { sanFrancisco,newYork }; // MKGeodesicPolyline *geodesic; geodesic = [MKGeodesicPolyline polylineWithCoordinates:&pointsArc[0] count:2]; // [self.mapView addOverlay:geodesic]; }

解决方法

实际上,注释可能是最佳选择.使用可指定的坐标属性(或使用MKPointAnnotation)定义注记类.

令人惊讶的是,MKGeodesicPolyline类足以提供它计算的各个点,通过points属性(给出MKMapPoints)或getCoordinates：range：方法(给出CLLOCATIOnCoordinate2Ds)来创建弧.

(实际上,该属性和方法在MKMultiPoint类中,MKPolyline是MKPolyline的子类,而MKGeodesicPolyline是MKPolyline的子类.)

只需在计时器上更新注释的坐标属性,地图视图就会自动移动注释.

注意：对于这么长的弧,会有数千个点.

这是一个非常简单粗略的例子,使用points属性(比getCoordinates：range：方法更容易使用)和performSELEctor：withObject：afterDelay ::

@H_489_9@//declare these ivars: MKGeodesicPolyline *geodesic; MKPointAnnotation *thePlane; int planePositionIndex; //after you add the geodesic overlay,initialize the plane: thePlane = [[MKPointAnnotation alloc] init]; thePlane.coordinate = sanFrancisco; thePlane.title = @"Plane"; [mapView addAnnotation:thePlane]; planePositionIndex = 0; [self performSELEctor:@SELEctor(updatePlanePosition) withObject:nil afterDelay:0.5]; -(void)updatePlanePosition { //this example updates the position in increments of 50... planePositionIndex = planePositionIndex + 50; if (planePositionIndex >= geodesic.pointCount) { //plane has reached end,stop moving return; } MKMapPoint nextMapPoint = geodesic.points[planePositionIndex]; //convert MKMapPoint to CLLOCATIOnCoordinate2D... CLLOCATIOnCoordinate2D nextCoord = MKCoordinateForMapPoint(nextMapPoint); //update the plane's coordinate... thePlane.coordinate = nextCoord; //schedule the next update... [self performSELEctor:@SELEctor(updatePlanePosition) withObject:nil afterDelay:0.5]; }