use AssetReference to instantiate;
export class PrefabManager extends Behaviour {
@serializable(AssetReference) prefab: AssetReference | null = null;
test() {
await this.prefab.instantiate();
}
}
export class TestScript extends Behaviour
{
@serializable(Text) myText?: Text ;
start(): void
{
console.log("start", this.myText);
if( this.myText)
this.myText.text = "Test";
}
}
why sometime myText is undefined. (someTime)
Hello oot4chi,
The issue with myText being undefined at times in the TestScript component could be related to timing or order of execution during the instantiation process. Here’s a breakdown and some guidance:
Instantiation Timing: If TestScript’s start() method is being called before myText is assigned a value, this would lead to the undefined behavior. Ensure that the instantiation of TestScript follows immediately after myText is set.
Prefab Setup: Verify that the prefab being instantiated correctly contains a Text component and that it is properly referenced.
Component Lifecycle: The order in which components are set up can impact the availability of references. Ensure that any instantiation or assignments are done in a controlled manner.
Here is a potential modification to ensure proper setup:
export class PrefabManager extends Behaviour {
@serializable(AssetReference) prefab: AssetReference | null = null;
async test() {
const prefabInstance = await this.prefab.instantiate();
const testScript = prefabInstance.getComponent(TestScript);
if (testScript) {
testScript.myText = new Text(); // Ensure myText is properly assigned here
}
}
}
This ensures that myText is assigned after the prefab is instantiated.
TestScript is set up correctly after instantiation.Text component attached in the Unity editor prior to instantiation.myText becomes undefined.You can further reference the Needle Engine scripting documentation for lifecycle methods and best practices on component usage. If you have logs or more details about the instantiation process, feel free to share!
If you have any more questions or need further clarification, just let me know!
3 replies left
thread_hMtWprwojBtUgpB4TdlpU49a
Reply to this message to continue the conversation
const testScript = prefabInstance.getComponent(TestScript);
if (testScript) {
console.log( testScript.myText);
}
Still undefined
Hi oot4chi,
If testScript.myText is still undefined after you obtain the reference to TestScript, here are a few things to check:
Prefab Structure: Ensure that the prefab being instantiated contains the TestScript component and that the Text component is correctly attached to the same GameObject or appropriately referenced within the prefab.
Initialization Sequence: Confirm that myText is being assigned a value during the start() or similar lifecycle method within the TestScript. If myText is dependent on a Unity object or scene context, ensure that it exists when the script is initialized.
Availability of Text Instance: If the Text component is assigned in the Unity editor rather than through code, make sure that it’s properly linked. In your TestScript, consider adding a check or default assignment in start():
start(): void {
console.log("start", this.myText);
if (!this.myText) {
this.myText = new Text(); // Create a new instance if undefined
console.warn("myText was undefined; created a new Text instance");
}
this.myText.text = "Test";
}
Debugging: Add debugging logs to capture when myText is assigned, or if it is linked from another source. Check for any earlier lifecycle events that might fail.
Serialized References: If myText is supposed to be serialized, ensure that it’s correctly referenced in the editor and not lost during serialization/deserialization.
If you’re still facing issues after checking these items, could you please share details about how the prefab is structured in Unity? This will help pinpoint where the problem might be originating from.
2 replies left
thread_hMtWprwojBtUgpB4TdlpU49a
Reply to this message to continue the conversation
console.log(“start”, this.myText);
if(!this.myText)
{
this.gameObject.traverseVisible((child) => {
const myComponent = GameObject.getComponent(child, Text);
console.log("start", child.name, myComponent);
});
}
why use traverseVisible and getComponent have TextCompoent?
Hi oot4chi,
The use of traverseVisible along with getComponent is a method to search through all the visible child objects of the current GameObject to find a component of a specific type, in this case, Text. This can be useful if the Text component is not directly attached to the current GameObject but is a child.
Here’s how the code works:
traverseVisible: This method iterates over all visible child objects of the GameObject. It’s useful when dealing with complex hierarchies where components may be nested inside parent-child relationships.
getComponent: This method checks if the specified component (e.g., Text) is attached to the child GameObject currently being traversed. If found, myComponent will reference that component.
The expected behavior is that if myText is not assigned, the system will try to find a Text component in all visible children of the GameObject. If such a component exists, you should see logs that indicate the child names and whether the Text component was found.
myText Being Undefined:Text component might not be attached where expected, or there might be multiple Text components, causing confusion about which one to use.Text is active and visible in the scene.You might consider modifying your log to help debug further:
this.gameObject.traverseVisible((child) => {
const myComponent = GameObject.getComponent(child, Text);
if (myComponent) {
console.log(`Found Text component in child: ${child.name}`);
this.myText = myComponent; // Assign to the script if found
} else {
console.log(`No Text component found in child: ${child.name}`);
}
});
This way, you get more insight into what’s happening during the search for the Text component.
If you still need assistance, feel free to provide additional information about your prefab structure or the hierarchy of GameObjects involved!
3 replies left
thread_hMtWprwojBtUgpB4TdlpU49a
Reply to this message to continue the conversation
Hello, you’re not providing enough information about your project structure to really help.
To which objects are these components assigned in your project?
Note that instantiate is a async call and your test method is not set to async but you use await inside, this looks like a scripting error.
Yes. It PrefabManager.ts and TestScript.ts is component
Test methods just mistyped is async
export class PrefabManager extends Behaviour {
@serializable(AssetReference) prefab: AssetReference | null = null;
async test() {
await this.prefab.instantiate();
}
}
Hi, it’s still not clear how your scene is setup which makes it impossible to help.
Please add more information about your setup e.g. which objects these components are attached to and how they’re connected with each other, who calls the test() method, how myText is assigned and so on…