mirror of
https://github.com/MirrorNetworking/Mirror.git
synced 2024-11-18 11:00:32 +00:00
47 lines
1.9 KiB
Markdown
47 lines
1.9 KiB
Markdown
# SyncVar Hook
|
|
|
|
[](https://www.youtube.com/watch?v=T7AoozedYfI&list=PLkx8oFug638oBYF5EOwsSS-gOVBXj1dkP&index=5)
|
|
|
|
The hook attribute can be used to specify a function to be called when the SyncVar changes value on the client. This ensures that all clients receive the proper variables from other clients.
|
|
- The Hook method must have a two parameters of the same type as the SyncVar property. One for the old value, one for the new value.
|
|
- The Hook is always called after the value was set. You don't need to set it yourself.
|
|
- The Hook only fires for changed values, and changing a value in the inspector will not trigger an update.
|
|
|
|
Below is a simple example of assigning a random color to each player when they're spawned on the server. All clients will see all players in the correct colors, even if they join later.
|
|
|
|
> Note: The signature for hook methods was changed in version 7.0 (Feb 2020) to having 2 parameters (old and new values). If you're on an older version, hook methods just have one parameter (new value).
|
|
|
|
```cs
|
|
using UnityEngine;
|
|
using Mirror;
|
|
|
|
public class PlayerController : NetworkBehaviour
|
|
{
|
|
[SyncVar(hook = nameof(SetColor))]
|
|
Color playerColor = Color.black;
|
|
|
|
// Unity makes a clone of the Material every time GetComponent<Renderer>().material is used.
|
|
// Cache it here and Destroy it in OnDestroy to prevent a memory leak.
|
|
Material cachedMaterial;
|
|
|
|
public override void OnStartServer()
|
|
{
|
|
base.OnStartServer();
|
|
playerColor = Random.ColorHSV(0f, 1f, 1f, 1f, 0.5f, 1f);
|
|
}
|
|
|
|
void SetColor(Color oldColor, Color newColor)
|
|
{
|
|
if (cachedMaterial == null)
|
|
cachedMaterial = GetComponent<Renderer>().material;
|
|
|
|
cachedMaterial.color = newColor;
|
|
}
|
|
|
|
void OnDestroy()
|
|
{
|
|
Destroy(cachedMaterial);
|
|
}
|
|
}
|
|
```
|