Why GetComponent on Dropdown doesn't work?-CodePudding

I'm doing settings section in my game, and there is a screen mode dropdown. I did 2 variables of dropdown, because when i try match dropdown variable and dropdown game object, it doesn't work. So, i match dropdown game object as GameObject, then i get dropdown component from dropdown game object by GetComponent. But, unity gives me an error: NullReferenceException: Object reference not set to an instance of an object What did i do wrong? There is the code:

public GameObject ddgo;
public Dropdown dd;
void Start() {
dd = ddgo.GetComponent<Dropdown>(); 
}
public void DDScreenMode() {
    if (dd.value == 0) {
      Screen.fullScreen = true;
      Debug.Log("Dropdown value fullscreen!");
   }
   if (dd.value == 1) {
       Screen.fullScreen = false;
       Debug.Log("Dropdown value window!");
   }

}

CodePudding user response：

Check if the dropdown component is on the ddgo gameobject not a child of it (if it is a child use GetComponentInChildren<Dropdown>() instead), if it is all good check if you gave ddgo the right gameOBject

CodePudding user response：

.GetComponent<Dropdown>() can only get gameObject's own component.

If you want to get component in child gameOjbect,

you should use GetComponentInChildren<T>() instead of GetComponent<T>()

Check if GameObject ddgo has Dropdown script.