call method
Implementation
int call(ffi.Pointer<ffi.Void> arg0) =>ref.pointer.ref.invoke.cast<ffi.NativeFunction<ffi.UnsignedLong Function(ffi.Pointer<objc.ObjCBlockImpl> block, ffi.Pointer<ffi.Void> arg0)>>()
.asFunction<int Function(ffi.Pointer<objc.ObjCBlockImpl> , ffi.Pointer<ffi.Void> )>()(
ref.pointer, arg0);