[英]Get a reference to a button from script in Unity
The script is attached to a prefab that is not in a scene. 该脚本附加到不在场景中的预制件。 The button has its tag. 按钮有标签。
I tried drag and dropping the button in the inspector, but the engine won't let me. 我试着在检查器中拖放按钮,但引擎不会让我。 I tried finding it by tag, but I get an exception "Cannot implicitly convert type UnityEngine.GameObject to UnityEngine.UI.Button " and when I cast I get an exception that I cannot convert these types via built-in conversion. 我尝试通过标签找到它,但我得到一个异常“不能隐式转换类型UnityEngine.GameObject到UnityEngine.UI.Button”,当我转换时,我得到一个异常,我无法通过内置转换转换这些类型。 Some help? 一些帮助? How do I get a reference to a button? 如何获得对按钮的引用? Here is the code : 这是代码:
using UnityEngine;
using System.Collections;
using UnityEngine.UI;
public class TankShooting : MonoBehaviour {
private Transform ShootingCameraTransform;
private PlayerTankMovement playerTankMovement;
public Button shootButton;
// Use this for initialization
void Start () {
shootButton = GameObject.FindGameObjectWithTag ("ShootButton") as Button;
shootButton.onClick.AddListener ((UnityEngine.Events.UnityAction)this.OnShootButtonClick);
playerTankMovement = GetComponent<PlayerTankMovement> ();
Transform t = transform;
foreach (Transform tr in t)
{
if (tr.tag == "ShootingCamera")
{
ShootingCameraTransform = tr.transform;
}
}
}
// Update is called once per frame
void Update () {
}
public void OnShootButtonClick()
{
Debug.Log ("Success");
}
}
Looking at your code, there is another problem: 查看您的代码,还有另一个问题:
shootButton = GameObject.FindGameObjectWithTag ("ShootButton") as Button;
You cannot cast Component( Button
) to GameObject like that. 你不能像这样将组件( Button
)强制转换为GameObject。 You have to use GetComponent
to get the Button
component from the GameObject. 您必须使用GetComponent
从GetComponent
获取Button
组件。
I cannot drag and drop the button in the inspector and when I find it by tag I cannot cast it from GameObject to Button 我无法在检查器中拖放按钮,当我通过标签找到它时,我无法将其从GameObject转换为Button
That's because the the GameObject you are dragging to the shootButton slot is not a Button or does not have the Button component attached to it. 那是因为您拖动到shootButton插槽的GameObject不是Button或者没有附加Button组件。 It must have the Button component for you to be able to drag it to the Button
(shootButton ) slot. 必须有Button组件才能将其拖动到Button
(shootButton)插槽。
You have to create a Button then drag that Button to the shootButton
slot. 您必须创建一个Button然后将该Button拖动到shootButton
插槽。
You can do that by first removing 你可以先删除
shootButton = GameObject.FindGameObjectWithTag ("ShootButton") as Button;
shootButton.onClick.AddListener ((UnityEngine.Events.UnityAction)this.OnShootButtonClick);
then drag the Button
to the shootButton
slot: 然后将Button
拖到shootButton
插槽:
OR 要么
get the reference from script: 从脚本中获取引用:
If you want to do this from script, replace 如果要从脚本执行此操作,请替换
shootButton = GameObject.FindGameObjectWithTag ("ShootButton") as Button;
shootButton.onClick.AddListener ((UnityEngine.Events.UnityAction)this.OnShootButtonClick);
with 同
shootButton = GameObject.FindGameObjectWithTag("ShootButton").GetComponent<Button>();
shootButton.onClick.AddListener(() => OnShootButtonClick());
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