Unity3D Application simulation enters the front and background and pauses

Foreword

At some point, the unity program runs in the background, and we need it to pause or close some functions, such as the currently playing animation, video, sound, etc., and continue to run the next time we return to the unity program.

Here we need to use two unity callback functions OnApplicationForcus and OnApplicationPause,Use the SendMessage method to send instructions, simulate and end the background operation, and automatically call OnApplicationForcus andOnApplicationPause method.

To close the background running of Unity3D for Windows, you can cancel Run In Background in PlayerSetting.

Reproduced below: https://blog.csdn.net/aa4790139/article/details/48087877

Normal progress:

OnApplicationFocus, isFocus=True

Normal Return:

OnApplicationQuit
Home out:

OnApplicationPause, isPause=True

OnApplicationFocus, isFocus=False

Home entry:

OnApplicationPause, isPause=False
OnApplicationFocus, _isFocus=True

Kill Process:

Double-click Home for the current application, then Kill:

OnApplicationQuit (IOS has a callback, android has no callback)

Jump out of the current application, then Kill:

OnApplicationQuit (no callback for IOS and Android)

Reproduced below: https://www.jianshu.com/p/cfa0263ea1b9

The easiest way to pause the game

Time.timeScale = 0;

When you want to continue playing

Time.timeScale = 1;

Note

When TimeScale is set to 0,

1. Update method will still be called
2. FixedUpdate method will not be called
3. Time.time will not continue to increase
4. Time.deltaTime will be affected

If you don't want to be affected by TimeScale

Time.unscaledDeltaTime replaces Time.deltaTime
Time.fixedUnscaledDeltaTime replaces Time.fixedDeltaTime
Time.unscaledTime replaces Time.time

Coroutines

Replace Time.deltaTime with Time.unscaledDeltaTime
Replace WaitForSeconds with WaitForSecondsRealtime

Animation Controller

CullingMode is set to UnscaledTime

How to pause audio playback

AudioListener.pause = true;

When the pause is over

AudioListener.pause = false;

What if I want to continue playing some sound effects when I paused?

AudioSource.ignoreListenerPause = true;

Simulation code snippet:

 void Update(){if (Input.GetKeyDown(KeyCode.A))SendMessageTest(true);else if (Input.GetKeyDown(KeyCode.S))SendMessageTest(false);}private void OnApplicationForcus(bool isForcus){if (isForcus){Debug.Log("isForcus:true");}else{Debug.Log("isForcus:false");}}private void OnApplicationPause(bool isPause){if (isPause){Debug.Log("isPause:true");Time.timeScale = 0;AudioListener.pause = true;}else{Debug.Log("isPause:false");Time.timeScale = 1;AudioListener.pause = false;}}void SendPause(bool isPause){transform.SendMessage("OnApplicationPause", isPause, SendMessageOptions.DontRequireReceiver);}void SendForcus(bool isForcus){transform.SendMessage("OnApplicationForcus", isForcus, SendMessageOptions.DontRequireReceiver);}public void SendMessageTest(bool pause){if (pause){SendPause(true);SendForcus(false);}else{SendPause(false);SendForcus(true);}}