實用的呼叫函式-Invoke() vs InvokeRepeating()

實用的呼叫函式-Invoke() vs InvokeRepeating()


Unity:
Version: 2020.3.12f1.590.2 Personal
Revision: 2020.3/release b3b2c6512326
Built: Tue, 08 Jun 2021 08:46:44 GMT

1.Invoke:

syntax:
Invoke(string MethodName,float t)
description:
Invoke the method MethodName() after t seconds.

[Note]
(1)Notice that "MethodName" is considered as MethodName() in compiler.
(2)Notice that because of (1), MethodName must be a string, so it must be quotated such as "MethodName".
(3)Notice that because of (1), the rule of naming of MethodName is almost same as the rule of naming of  a variable in C#. i.e. it only can contain a uppercase or lowercase or _ or digits in the string method name. It can not contain a bracket or other special character.
(4)Notice that if t is set to zero, the MethodName() will be called in the  beginning of then next Update() cycle.


[Review]
Debug.Log("a") means that a will be output in Unity Console.
more details on the website:

code 1:
void Start()
{
Debug.Log("Start.");
Invoke("MethodName",0f);
Debug.Log("end Start.");
}
void Update()
{
Debug.Log("Update.");
Debug.Log("end Update.");
}
private void MethodName()
{
Debug.Log("Mehod Name.");
}

ideal execution process:
Debug.Log("Start.");
Debug.Log("end Start.");
Debug.Log("Mehod Name.");
Debug.Log("Update.");
Debug.Log("end Update.");
Debug.Log("Update.");
Debug.Log("end Update.");

code 2:
void Start()
{
Debug.Log("Start.");
Debug.Log("end Start.");
}
void Update()
{
Debug.Log("Update.");
Invoke("MethodName",0f);
Debug.Log("end Update.");
}

ideal execution process:
Debug.Log("Start.");
Debug.Log("end Start.");
Debug.Log("Update.");
Debug.Log("end Update.");
Debug.Log("Mehod Name.");
Debug.Log("Update.");
Debug.Log("end Update.");
Debug.Log("Mehod Name.");
Debug.Log("Update.");
Debug.Log("end Update.");

2.InvokeRepeating:

syntax:
InvokeRepeating(string MethodName,float t,float rate)
description:
Invoke the method MethodName() after t seconds and repeat it infinitely with rate seconds.
i.e. after t seconds , the MethodName() will be called. after it was executed , MethodName() will be called in  rate seconds.

[Note]
Notice that if time scale is set to zero, the MethodName() will not be called.
Notice that if t is set to zero, the MethodName() will be called at the beginning of next Update() every time.


3. my code and description 

e.g.1
  void Start()
    {       
        
    }
    void Update()
    {
        Debug.Log("Update!");
        Invoke("InstantiateABullet", 0f);
        Debug.Log("end Update!");
    }
private void InstantiateABullet()
    {
            Debug.Log("Instantiate A Bullet!");
    }
execution process:
Debug.Log("Update!");
->
Debug.Log("end Update!");
->
Debug.Log("Instantiate A Bullet!");
->
Debug.Log("Update!");
->
Debug.Log("end Update!");
->
...etc

e.g.2
void Start()
    {       
Invoke("InstantiateABullet", 0f);
        Debug.Log("end Start!");
    }
    void Update()
    {
        Debug.Log("Update!");
        
        Debug.Log("end Update!");
    }
private void InstantiateABullet()
    {
            Debug.Log("Instantiate A Bullet!");
    }
execution process:
Debug.Log("end Start!");
->
Debug.Log("Instantiate A Bullet!");
->
Debug.Log("Update!");
->
Debug.Log("end Update!");
->
Debug.Log("Update!");
->
Debug.Log("end Update!");
->
...
e.g.3
void Start()
    {       
InvokeRepeating("InstantiateABullet", 1.0f,2f);
        Debug.Log("end Start!");
    }
    void Update()
    {
        Debug.Log("Update!");
        
        Debug.Log("end Update!");
    }
private void InstantiateABullet()
    {
            Debug.Log("Instantiate A Bullet!");
    }
execution process:
Debug.Log("end Start!");
Debug.Log("Instantiate A Bullet!");
Debug.Log("Update!");
->
Debug.Log("end Update!");
->
Debug.Log("Update!");
->
Debug.Log("end Update!");
->
...
->
Debug.Log("Instantiate A Bullet!");
->
Debug.Log("Update!");
->
Debug.Log("end Update!");
->
...
e.g.5
 void Start()
    {
        timer = 0f;
        Debug.Log("end Start!");
        Debug.Log("Time.deltaTime=" + Time.deltaTime.ToString());
    }
    
    void FixedUpdate()
    {
        InvokeRepeating("InstantiateABullet", 1.0f, 2f);
        Debug.Log("Update!");
        timer = Time.deltaTime;
        Debug.Log("Time.deltaTime=" + Time.deltaTime.ToString());       
        Debug.Log("end Update!");
    }
    private void InstantiateABullet()
    {
            Debug.Log("Instantiate A Bullet!");
    }
execution process:
Debug.Log("end Start!");
Debug.Log("Update!");
Debug.Log("end Update!");
Debug.Log("Update!");
Debug.Log("end Update!");
...
->
Debug.Log("Instantiate A Bullet!");
->
Debug.Log("Update!");
->
Debug.Log("end Update!");
->
...

e.g.6
 void Start()
    {
        timer = 0f;
        Debug.Log("end Start!");
        Debug.Log("Time.deltaTime=" + Time.deltaTime.ToString());
    }
    
    void FixedUpdate()
    {
        InvokeRepeating("InstantiateABullet", 1.0f, 0f);
        Debug.Log("Update!");
        timer = Time.deltaTime;
        Debug.Log("Time.deltaTime=" + Time.deltaTime.ToString());       
        Debug.Log("end Update!");
    }
    private void InstantiateABullet()
    {
            Debug.Log("Instantiate A Bullet!");
    }
execution process:
Debug.Log("end Start!");
Debug.Log("Update!");
->
Debug.Log("end Update!");
->
Debug.Log("Instantiate A Bullet!");
->
Debug.Log("Update!");
->
Debug.Log("end Update!");
->
...
->
Debug.Log("Instantiate A Bullet!");
->
Debug.Log("Update!");
->
Debug.Log("end Update!");
->
...
e.g.7
 void Start()
    {
        timer = 0f;
        Debug.Log("end Start!");
        Debug.Log("Time.deltaTime=" + Time.deltaTime.ToString());
    }
    
    void FixedUpdate()
    {
        InvokeRepeating("InstantiateABullet", 1.0f, 0f);
        Debug.Log("Update!");
        timer = Time.deltaTime;
        Debug.Log("Time.deltaTime=" + Time.deltaTime.ToString());       
        Debug.Log("end Update!");
    }
    private void InstantiateABullet()
    {
            Debug.Log("Instantiate A Bullet!");
    }
execution process:
Debug.Log("end Start!");
->
Debug.Log("Update!");
->
Debug.Log("end Update!");
->
Debug.Log("Instantiate A Bullet!");
->
Debug.Log("Update!");
->
Debug.Log("end Update!");
->
...
->
Debug.Log("Instantiate A Bullet!");
->
Debug.Log("Update!");
->
Debug.Log("end Update!");
->
...

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