ios - 添加后 GMSMarker 未显示在 map 上

Question

我正在使用按钮在特定位置添加图钉，并且我的 map 已加载并显示在屏幕上。然后按下按钮没有响应，即使标记创建并分配坐标也是如此。

-(IBAction)addingMarkerOnMap:(id)sender
{
    CLLocationCoordinate2D position = CLLocationCoordinate2DMake(51.5, -0.127);
    GMSMarker *london = [GMSMarker markerWithPosition:position];
    london.title = @"London";
    london.icon = [UIImage imageNamed:@"Standard"];
    london.map = self.mapView;

}

Answer 1

试试这个代码:

-(IBAction)addingMarkerOnMap:(id)sender
{
  dispatch_async(dispatch_get_main_queue(), ^{
    CLLocationCoordinate2D position = CLLocationCoordinate2DMake(51.5, -0.127);
    GMSMarker *london = [GMSMarker markerWithPosition:position];
    london.title = @"London";
    london.icon = [UIImage imageNamed:@"Standard"];
    london.map = self.mapView;
 });
}