How Do I Detect Clicks and Touches on UI Elements and GameObjects in Unity?

Test the click and touch event of the UI elements and game objects in unity

This article introduces how to detect the clicks and touch events of UI elements and game objects in Unity.

UI incident processing

On the Android platform, the touch of the UI object in Canvas no longer uses the Input API. Instead, subscribe to the UI event or implement the interface based on the required events.

Image, rawimage and text components:

Implement the required interfaces (for example, , ) and rewrite its functions to handle the event.

button component: IPointerClickHandler IPointerDownHandler

Use the button event registration button click:

Enter the field component:

Register input field event:

<code class="language-C#">button1.onClick.AddListener(() => buttonCallBack(button1));</code>

slider component:

Detecting changes in the slider value:

<code class="language-C#">inputField.onEndEdit.AddListener(delegate { inputEndEdit(); });</code>

Drop -down menu component:

Register the change of the drop -down menu value:

<code class="language-C#">slider.onValueChanged.AddListener(delegate { sliderCallBack(slider.value); });</code>

Non -UI game objects

3D object (grid renderer/collision):

Add

<code class="language-C#">dropdown.onValueChanged.AddListener(delegate { callBack(); });</code>

to the camera and use events described in the previous UI object interface method.

2D object (the elves rendereer/collision):

Add to the camera and use events in the interface method.

Event system failure exclusion

PhysicsRaycaster

Click

Event system:

Make sure Physics2DRaycaster in the scene.

Gotic: UI components must be located under the canvas.

Radio projection:

For 3D objects, ensure that is attached to the camera. For 2D objects, ensure that is attached to the camera.

Script addition:

For UI objects using the interface function, ensure that the script is attached to the object to detect the click.
• UI level: Check whether there are any UI element to block the target object. EventSystem
Disable object:
• Verify whether the target object is not disabled.

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