Unity Timer

Run actions after a delay in Unity3D.

This library has been battle-tested and hardened throughout numerous projects, including the award-winning Pitfall Planet.

Written by Alexander Biggs + Adam Robinson-Yu.

Fork by GH-ZJ(wustzhangjie@gmail.com)

Basic Example

The Unity Timer package provides the following method for creating timers:

public static DelayTimer DelayAction(float duration, Action onComplete, Action<float> onUpdate = null, bool useRealTime = false, Object autoDestroyOwner = null);

public static DelayFrameTimer DelayFrameAction(int frame, Action onComplete, Action<float> onUpdate = null, Object autoDestroyOwner = null);

public static LoopTimer LoopAction(float interval, Action<int> onComplete, Action<float> onUpdate = null, bool useRealTime = false, bool executeOnStart = false, Object autoDestroyOwner = null);
        
public static LoopUntilTimer LoopUntilAction(float interval, Func<LoopUntilTimer, bool> loopUntil, Action<int> onComplete, Action<float> onUpdate = null, Action onFinished = null, bool useRealTime = false, bool executeOnStart = false, Object autoDestroyOwner = null);

public static LoopCountTimer LoopCountAction(float interval, int loopCount, Action<int> onComplete, Action<float> onUpdate = null, Action onFinished = null, bool useRealTime = false, bool executeOnStart = false, Object autoDestroyOwner = null);

public static DelayTimer PersistenceDelayAction(float duration, Action onComplete, Action<float> onUpdate = null, bool useRealTime = false, Object autoDestroyOwner = null);

public static DelayFrameTimer PersistenceDelayFrameAction(int frame, Action onComplete, Action<float> onUpdate = null, Object autoDestroyOwner = null);

public static LoopTimer PersistenceLoopAction(float interval, Action<int> onComplete, Action<float> onUpdate = null, bool useRealTime = false, bool executeOnStart = false, Object autoDestroyOwner = null);

public static LoopUntilTimer PersistenceLoopUntilAction(float interval, Func<LoopUntilTimer, bool> loopUntil, Action<int> onComplete, Action<float> onUpdate = null, Action onFinished = null, bool useRealTime = false, bool executeOnStart = false, Object autoDestroyOwner = null);

public static LoopCountTimer PersistenceLoopCountAction(float interval, int loopCount, Action<int> onComplete, Action<float> onUpdate = null, Action onFinished = null, bool useRealTime = false, bool executeOnStart = false, Object autoDestroyOwner = null);

Motivation

Out of the box, without this library, there are two main ways of handling timers in Unity:

1. Use a coroutine with the WaitForSeconds method.
2. Store the time that your timer started in a private variable (e.g. startTime = Time.time), then check in an Update call if Time.time - startTime >= timerDuration.

The first method is verbose, forcing you to refactor your code to use IEnumerator functions. Furthermore, it necessitates having access to a MonoBehaviour instance to start the coroutine, meaning that solution will not work in non-MonoBehaviour classes. Finally, there is no way to prevent WaitForSeconds from being affected by changes to the time scale.

The second method is error-prone, and hides away the actual game logic that you are trying to express.

This library alleviates both of these concerns, making it easy to add an easy-to-read, expressive timer to any class in your Unity project.

Features

• Make a timer repeat by call Timer.LoopAction.

private void Start()
{
   Timer.LoopAction(5, loopTime => { Debug.LogError("Timer Called: " + loopTime); });
}

• Make a loop timer execute when start by setting executeOnStart to true.

private void Start()
{
   Timer.LoopAction(5, loopTime => { Debug.LogError("Timer Called: " + loopTime); }, executeOnStart: true);
}

• Make a timer based on frame count by call Timer.DelayFrameAction.

private void Start()
{
   Timer.DelayFrameAction(5, () => { Debug.LogError("Timer Called"); });
}

• Measure time by realtimeSinceStartup instead of scaled game time by setting [Obsolete("Use updateMode to instead.")]useRealTime to true. Default is false.

private void Start()
{
   Timer.DelayAction(5, () => { Debug.LogError("Timer Called"); }, useRealTime: true);
}

• Measure time by time or unscaledTime or realtimeSinceStartup by setting updateMode to Timer.UpdateMode.GameTime or Timer.UpdateMode.UnscaledGameTime or Timer.UpdateMode.RealTime. Default is Timer.UpdateMode.GameTime.

private void Start()
{
   Timer.DelayAction(5, () => { Debug.LogError("Timer Called"); }, null, Timer.UpdateMode.UnscaledGameTime);
}

• Cancel a timer after calling it.

Timer timer;

void Start() {
   timer = Timer.LoopAction(5, _ => { Debug.LogError("Timer Called"); });
}

void Update() {
   if (Input.GetKeyDown(KeyCode.X)) {
      Timer.Cancel(timer);
   }
}

• Attach the timer to a UnityEngine.Object by setting autoDestroyOwner to the UnityEngine.Object, so that the timer is destroyed when the UnityEngine.Object is.

Very often, a timer called from a Component will manipulate that component's state. Thus, it is common practice to cancel the timer in the OnDestroy method of the Component. We've added a convenient extension method that attaches a Timer to a Component such that it will automatically cancel the timer when the Component is detected as null.

public class CoolMonoBehaviour : MonoBehaviour {

   private void Start()
   {
      //The timer will cancel when the Component is destroyed;
      Timer.DelayAction(5, () => { Debug.LogError("Timer Called"); }, useRealTime: true, autoDestroyOwner: this);
   }

   private void Update()
   {
      // This code could destroy the object at any time!
      if (Input.GetKeyDown(KeyCode.X)) {
         GameObject.Destroy(this.gameObject);
      }
   }
}

• Update a value gradually over time using the onUpdate callback.

// Change a color from white to red over the course of five seconds.
Color color = Color.white;
float transitionDuration = 5f;

Timer.DelayAction(transitionDuration,
   onUpdate: secondsElapsed => color.r = 255 * (secondsElapsed / transitionDuration),
   onComplete: () => Debug.Log("Color is now red"));

• A number of other useful features are included!

• timer.Pause()
• timer.Resume()
• timer.Cancel()
• timer.Restart()
• timer.GetTimeElapsed()
• timer.GetTimeRemaining()
• timer.GetRatioComplete()
• timer.isDone
• Timer.CancelAllRegisteredTimers()
• Timer.CancelAllRegisteredTimersByOwner(owner)
• Timer.PauseAllRegisteredTimers()
• Timer.ResumeAllRegisteredTimers()

• Make a timer not effect by Timer.XXXAllRegisteredTimers() function by call Timer.PersistenceXXX() function.

Timer timer;

void Start() {
   //The timer will not cancel when Timer.XXXAllRegisteredTimers();
   timer = Timer.PersistenceLoopAction(5, _ => { Debug.LogError("Timer Called"); });
}

void Update() {
   //No effect to timer
   if (Input.GetKeyDown(KeyCode.X))
      Timer.CancelAllRegisteredTimers();

   //Only this can cancel persistence timer
   if(Input.GetKeyDown(KeyCode.C))
      Timer.Cancel(timer);//same to timer?.Cancel();
}

• All timer generator functions can shortcut call by using Component/GameObject Extensions functions, and the timer will attach to the Component/GameObject so that the timer is destroyed when the Component/GameObject is.

void Start() {
   //The timer will attach to the Component instance.
   this.DelayAction(5, () => { Debug.LogError("Timer Called"); });
}

• A test scene + script demoing all the features is included with the package in the /Example folder.

Usage Notes / Caveats

• All timers will not destroy when change scene, because TimerManager is DontDestroyOnLoad.