Once a variable change, call the function

Unity Engine
,
1

I am developing a multiplayer game with Photon. There is a string variable. I can change this string variable on my master client. I want to sync the string value to all clients, and as long as string value is updated, another function is invoked.
For example, I updated this string variable to “Hello there”, once the clients receives this change, another function is called. I know RPC call can sync the variable like the code below. However, I don’t know how I can invoke another function once the string value changes.

if (PhotonNetwork.isMasterClient)
photonView.RPC (“SendMessageRPC”, PhotonTargets.All, “Hello there!”);

Thanks for your help.

2

I’m not familiar if Photon has some built in functionality for this (haven’t tried Photon for more than a few hours), but you can pretty easily brute force this.

private string mySyncedString = "";   //This string is somehow synced using Photon, RPC I guess
private string mySyncedStringOld = "";  //old value of the synced string we retain for comparison

void Update()
{
    if (mySyncedString != mySyncedStringOld)  //Check if mySyncedString has changed
    {
        callMeWhenStringChanges();  //It changed, so call some function
    }
}

void callMeWhenStringChanges()
{
    //Do something useful here I assume


    //Set the old value of the string to the new value so we can check again in future frames for additional changes
    mySyncedStringOld = mySyncedString;
}
3

CustomProperties are probably the best way to go with this. There is a callback on all clients whenever a custom property value is changed, so you could call your function in that.