我正在使用最新的 iOS 版谷歌地图 API 绘制折线。我正在逐点构建折线,但它无法正确渲染,因为当我缩小折线时,折线会从地图上消失(不是字面意义上的),而当我放大时,它只会显示该线。
这是我绘制折线的函数
RCPolyline *polyline = [[RCPolyline alloc] init];
[polyline drawPolylineFromPoint:self.selectedEmployee.location toPoint:location];
我已经覆盖
init:
RCPolyline 是这样的
- (instancetype)init {
self = [super init];
if (self) {
self.strokeWidth = 5.0f;
self.strokeColor = UIColor.redColor;
self.geodesic = YES;
self.map = [RCMapView sharedMapView];
}
return self;}
并且
drawPolylineFromPoint:toPoint:
会这样做
- (void)drawPolylineFromPoint:(CLLocation *)pointX toPoint:(CLLocation *)pointY {
GMSMutablePath *path = [GMSMutablePath path];
[path addCoordinate:pointX.coordinate];
[path addCoordinate:pointY.coordinate];
self.path = path;}
我发现了问题,我正在制作
RCPolyline
类的本地实例,并调用构造折线的方法,我想要的是为 RCPolyline 实例创建一个全局对象,并更新 GMSPath
类的 RCPolyline
实例
类似这样的:
- (instancetype)initWithMap:(GMSMapView *)mapView {
self = [super init];
if (self) {
self.strokeWidth = 4.0f;
self.strokeColor = [UIColor redColor];
self.geodesic = YES;
self.map = mapView;
self.mutablePath = [GMSMutablePath path];
}
return self;}
现在我从同一个实例调用这个方法。
- (void)appendPolylineWithCoordinate:(CLLocation *)location {
[self.mutablePath addCoordinate:location.coordinate];
self.path = self.mutablePath;}
PS:
RCPolyline
是GMSPolyline
的子类
试试这个代码。
- (void)fetchPolylineWithOrigin:(CLLocation *)origin destination:(CLLocation *)destination {
GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:lat longitude:longg zoom:12];
GMSMapView *mapView = [GMSMapView mapWithFrame:CGRectZero camera:camera];
mapView.myLocationEnabled = YES;
self.view = mapView;
GMSMarker *marker = [[GMSMarker alloc] init];
marker.position = CLLocationCoordinate2DMake(-33.86, 151.20);
marker.map = mapView;
NSString *originString = [NSString stringWithFormat:@"%f,%f", origin.coordinate.latitude, origin.coordinate.longitude];
NSString *destinationString = [NSString stringWithFormat:@"%f,%f", destination.coordinate.latitude, destination.coordinate.longitude];
NSString *directionsAPI = @"https://maps.googleapis.com/maps/api/directions/json?";
NSString *directionsUrlString = [NSString stringWithFormat:@"%@&origin=%@&destination=%@&mode=driving&key=%@&alternatives=true", directionsAPI, originString, destinationString,@"YOUR API KEY"];
NSURL *directionsUrl = [NSURL URLWithString:directionsUrlString];
NSURLSessionDataTask *fetchDirectionsTask = [[NSURLSession sharedSession] dataTaskWithURL:directionsUrl completionHandler:
^(NSData *data, NSURLResponse *response, NSError *error)
{
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
if(error)
{
return;
}
NSArray *routesArray = [json objectForKey:@"routes"];
GMSPolyline *polyline = nil;
int i=1;
for (id route in routesArray)
{
NSDictionary *routeDict = [route valueForKey:@"overview_polyline"];
NSString *points = [routeDict objectForKey:@"points"];
GMSCoordinateBounds *bounds = [[GMSCoordinateBounds alloc] init];
GMSPath *path = [GMSPath pathFromEncodedPath:points];
polyline = [GMSPolyline polylineWithPath:path];
polyline.strokeWidth = 3;
if(i==1)
{
polyline.strokeColor = [UIColor greenColor];
}else if(i==2)
{
polyline.strokeColor = [UIColor redColor];
}else{
polyline.strokeColor = [UIColor blueColor];
}
i = i+1;
bounds = [bounds includingCoordinate:marker.position];
polyline.map=mapView;
}
}];
[fetchDirectionsTask resume];
}
你有解决办法吗..?谷歌地图折线无法完美渲染