使用objective-c 指针绑定iOS 库错误？

试试下面的代码

   //ApiDefinition.cs
    [Static][Export ("polylineWithCoordinates:count:")][Internal]
 MGLPolyline PolylineWithCoordinates (IntPtr coords, nuint count);

// Extra.cs
public partial class MGLPolyline
{
    public static unsafe MGLPolyline PolylineWithCoordinates(CLLocationCoordinate2D[] coords)
    {
        MGLPolyline line = null;

        fixed(void* arrPtr = coords)
        {

            IntPtr ptr = new IntPtr(arrPtr);
            line = MGLPolyline.PolylineWithCoordinates(ptr, 2);   
        }

        return line;
    }
}