Basic syntax of unity script (7) - member variables and instantiation

Member variables

In general , Variables defined outside the method are member variables , If this variable is public Type of , You can see in the property panel . If you modify its value in the property panel , Its value will be automatically maintained with the project

Public variables

public int a=1;

You can see this variable in the property panel , The name is a, The default value displayed is “1”, Readers can modify its value in the property panel at any time

If you declare a variable of component type ( similar GameObject、Transform、Rigidbody etc. ), You need to drag the game object to the variable in the property panel and determine its value .

public class variable : MonoBehaviour {
    

	public Transform ren;

	void Update () {
    

		if (Vector3.Distance(ren.position,transform.position) > 10)// If ren and transform The distance is greater than 10
		{
    
			Debug.Log(ren.position);
		}
		
	}
}

Private variables

Can pass private Keyword to create private variables , These variables are not displayed in the property panel , Can avoid being modified .

    private Transform ren;

	void Update () {
    

		if (Vector3.Distance(ren.position,transform.position) > 10)// If ren and transform The distance is greater than 10
		{
    
			Debug.Log(ren.position);
		}
		
	}

Static member variable

stay C# In the script, you can use static Keyword to create global variables , In this way, the variable can be called between different scripts .

public static int test;

If you call a variable from another script Test, Can pass “ Script name . Variable name ” Method to call .

public class Test:MonoBehaviour{
    
    void Start()
    {
    
      Test.test=1;// by Test Script test Variable assignment 
    }
}

Instantiate game object

stay Unity If you want to create game objects , You can create game objects in the scene through the create game object menu . These game objects are created when the scene is loaded ; You can also dynamically create game objects in scripts . In the course of the game , The method of instantiating game objects in scripts as needed is more flexible .

If you want to Unity Create many of the same objects in ( Like a bullet from a gun ) when , It can be instantiated (Instantiate) Fast implementation . The instantiated game object contains all the attributes of the object , This ensures that the required objects are created intact . Instantiate in Unity Many uses in , It is very necessary to use it reasonably .


Instantiation method

Destroy(gameObject,n) The method is in n Destroy the object in seconds . If you want to destroy the object immediately , have access to DestroyImmediate(gameObject,boolean), If the Boolean value of the parameter is true, Destroy the object immediately