Related use of unityc intermediate grammar

Tips ： The following is the main body of this article

Paradigm singleton

explain ： If you don't understand the paradigm, you can jump to Official model teaching
Or jump to my C# Basic to the model description in the introductory chapter

1、 establish 

public class Singleson<T> : MonoBehaviour where T :
{
    private static T instance;

    public static T Instance { get => instance; }

    // A virtual method of the parent class 
    protected virtual void Awake()
    {
        if (instance != null)
            Destroy(gameObject);
        else
            instance = (T)this;
    }
    // Judge whether it is empty / clear 
    protected virtual void OnDestroy()
    {
        if (instance == this)
        {
            instance = null;
        }
    }
    // Judge whether the single instance is empty 
    public static bool IsInitialized
    {
        get { return instance != null; }
    }
}
2、 Use 

public class GameManager : Singleson<GameManager>
{
    public int playerStats;

    public void RigisterPlayer(int player)
    {
        playerStats = player;
    }
    
3.  summary 
 You don't have to create one by one Instance Single case 
 If you want to use singleton, inherit Singleson<T> Singleton class 	
}

Use of interfaces

If you don't understand the interface, you can jump to Official single case teaching

1、 establish 
public interface IEndGameObsever
{

    public void EndObserve();

}
2、 Use 
public List<IEndGameObsever> endGameObsevers = new List<IEndGameObsever>();

public void AddObserve(IEndGameObsever observer)
{
    endGameObsevers.Add(observer);
}

public void RemoveObserve(IEndGameObsever observer)
{
    endGameObsevers.Remove(observer);
}

public void NotifyObserver()
{
    foreach (var item in endGameObsevers)
    {
        item.EndObserve();
    }
}
3、 effect 
 In a particular state   If you die, you can call NotifyObserver Inform those who use this interface to do something, such as playing victory animation 
public void EndObserve()
{
	/// < summary >
	///  The end is the interface of execution i
	/// </ summary >
	isWalk = false;
	isChase = false;
	// Perform animation of victory, etc 
	animator.SetBool("isVictory", true);
	attackTarget = null;
	isPlayerObserve = true;
}

Common and easy-to-use methods

And how to play with duohao →→→： You can jump to Official teaching
Use the code ：

 Create a static class 

public static class ExtensionMethod
{

    private const float distance = 0.5f;

    public static bool isFacingTarger(this Transform transform, Transform targer)
    {
        Vector3 diretion = targer.transform.position - transform.position;
        diretion.Normalize();
	 This method is to judge the right and left sides of the attack 0.5 Are there any enemies , If he runs behind the enemy before the blood deduction is triggered, he will not be attacked 
        var dot = Vector3.Dot(transform.forward, diretion);

        return dot > distance;
    }

}

explain ： You can run behind the enemy when the enemy cuts down , Then you won't be attacked ！

summary

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