call method
Implementation
void call(ffi.Pointer<ffi.Void> arg0, objc.NSString? arg1) =>ref.pointer.ref.invoke.cast<ffi.NativeFunction<ffi.Void Function(ffi.Pointer<objc.ObjCBlockImpl> block, ffi.Pointer<ffi.Void> arg0, ffi.Pointer<objc.ObjCObject> arg1)>>()
.asFunction<void Function(ffi.Pointer<objc.ObjCBlockImpl> , ffi.Pointer<ffi.Void> , ffi.Pointer<objc.ObjCObject> )>()(
ref.pointer, arg0, arg1?.ref.pointer ?? ffi.nullptr);