【Unity】PhotonNetwork.OnEventCallをAsObservableにする【PhotonRx】 ref: http://qiita.com/su10/items/1b7a792ce9bd90debdb0

file1.cs

// 使い方
PhotonNetwork.OnEventCall
    .AsObservable()
    .Subscribe(tuple =>
    {
        var eventCode = tuple.Item1;
        var content = tuple.Item2;
        var senderId = tuple.Item3;

        Debug.Log("OnEventCall");
    });

PhotonExtensions.cs

namespace UniRx
{
    public static class PhotonExtensions
    {
        public static IObservable<Tuple<byte, object, int>> AsObservable(this PhotonNetwork.EventCallback eventCallback)
        {
            return Observable.FromEvent<PhotonNetwork.EventCallback, Tuple<byte, object, int>>(
                h => (x, y, z) => h(Tuple.Create(x, y, z)),
                h => PhotonNetwork.OnEventCall += h,
                h => PhotonNetwork.OnEventCall -= h
            );
        }
    }
}