Input action maps in Unity - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an Input Action Map in Unity's Input System?

An Input Action Map is a collection of input actions grouped together, usually representing a set of controls for a specific gameplay context, like player movement or UI navigation.

beginner

How do you create an Input Action Map in Unity's Input System?

You create an Input Action Map by opening the Input Actions asset, then adding a new Action Map and defining actions inside it with their bindings.

intermediate

What is the purpose of enabling and disabling Input Action Maps?

Enabling an Input Action Map activates its input actions so they respond to player input. Disabling stops them from responding, useful to switch control contexts.

intermediate

How can you listen for input events from an Input Action Map in code?

You can subscribe to the performed, started, or canceled events of actions inside the Input Action Map to run code when input happens.

intermediate

What is the benefit of using multiple Input Action Maps in a game?

Using multiple Input Action Maps lets you organize controls by game state or mode, like separate maps for gameplay, menus, or cutscenes, making input management cleaner.

What does enabling an Input Action Map do?

A Activates its input actions to respond to input

B Deletes the input actions

C Saves the input actions to disk

D Disables all other input maps

Enabling an Input Action Map makes its actions listen for player input.

Where do you define Input Action Maps in Unity?

A In the Player Settings

B In the Input Actions asset

C In the Scene Hierarchy

D In the Physics Settings

Input Action Maps are created and edited inside the Input Actions asset file.

Which event would you use to detect when a button is pressed?

A performed

B started

C canceled

D completed

The 'performed' event fires when the input action is triggered, like a button press.

Why use multiple Input Action Maps?

A To increase game performance

B To reduce file size

C To organize controls by game context

D To disable input completely

Multiple maps help separate controls for different game states or modes.

What happens if you disable an Input Action Map?

A It resets input bindings

B It deletes all actions

C It duplicates the map

D Its actions stop responding to input

Disabling a map stops its actions from listening to input.

Explain what an Input Action Map is and why it is useful in Unity's Input System.

Think about how you organize controls for different parts of a game.

Describe how you would switch between different Input Action Maps during gameplay.

Consider what happens when a player opens a menu or enters a cutscene.

Practice

1.

What is the main purpose of an Input Action Map in Unity's Input System?

easy

A. To handle audio playback

B. To render graphics on the screen

C. To store game settings permanently

D. To group related input actions for easier management

Solution

1. Step 1: Understand what Input Action Maps do

   Input Action Maps group related input actions, like movement or UI controls, to organize inputs.

2. Step 2: Compare with other options

   Rendering graphics, storing settings, and audio playback are unrelated to input action maps.

3. Final Answer:

   To group related input actions for easier management -> Option D

4. Quick Check:

   Input Action Maps = Group inputs [OK]

Hint: Remember: Action maps group inputs logically [OK]

Common Mistakes:

• Confusing input maps with graphics or audio systems
• Thinking action maps store data permanently
• Assuming action maps handle rendering

2.

Which of the following is the correct way to enable an InputActionMap named playerControls in C#?

?

easy

A. playerControls.Activate();

B. playerControls.Start();

C. playerControls.Enable();

D. playerControls.Run();

Solution

1. Step 1: Recall the method to enable input action maps

   The correct method to enable an InputActionMap is Enable().

2. Step 2: Verify other options

   Start(), Activate(), and Run() are not valid methods for InputActionMap.

3. Final Answer:

   playerControls.Enable(); -> Option C

4. Quick Check:

   Enable() activates input maps [OK]

Hint: Use Enable() to start input action maps [OK]

Common Mistakes:

• Using Start() instead of Enable()
• Confusing method names with other Unity components
• Forgetting to enable the action map before use

3.

Given the following code snippet, what will be the output when playerControls is enabled and the player presses the jump button?

var playerControls = new PlayerInputActions();
playerControls.Player.Jump.performed += ctx => Debug.Log("Jump pressed");
playerControls.Player.Enable();
// Player presses jump button

medium

A. Jump pressed

B. No output

C. NullReferenceException

D. Jump pressed twice

Solution

1. Step 1: Understand event subscription and enabling

   The code subscribes to the Jump action's performed event and enables the Player action map.

2. Step 2: Predict output on jump button press

   When the jump button is pressed, the subscribed lambda logs "Jump pressed" once.

3. Final Answer:

   Jump pressed -> Option A

4. Quick Check:

   Subscribed event triggers log once [OK]

Hint: Enabling action map triggers subscribed events [OK]

Common Mistakes:

• Forgetting to enable the action map
• Expecting multiple logs without multiple subscriptions
• Confusing event names or missing subscription

4.

What is wrong with this code snippet that tries to disable an input action map?

var controls = new PlayerInputActions();
controls.Player.Disable();
controls.Player.performed += ctx => Debug.Log("Action performed");

medium

A. The event subscription is on the action map instead of a specific action

B. Disable() method does not exist on InputActionMap

C. You cannot disable an action map before subscribing to events

D. The code should call Enable() before Disable()

Solution

1. Step 1: Check event subscription target

   The code subscribes to performed on controls.Player, which is an InputActionMap, not an InputAction.

2. Step 2: Understand correct subscription

   Events like performed belong to InputActions, e.g., controls.Player.Jump.performed, not the whole map.

3. Final Answer:

   The event subscription is on the action map instead of a specific action -> Option A

4. Quick Check:

   Subscribe events on actions, not maps [OK]

Hint: Subscribe events on actions, not action maps [OK]

Common Mistakes:

• Subscribing events on InputActionMap instead of InputAction
• Confusing Disable() method availability
• Assuming order of Enable/Disable affects subscription

5.

You want to switch between two control schemes, Keyboard and Gamepad, during gameplay using input action maps. Which approach correctly handles this switch?

?

hard

A. Use only one action map and ignore control schemes

B. Disable the current action map and enable the other action map

C. Create new input actions every time you switch

D. Enable both action maps at the same time

Solution

1. Step 1: Understand control scheme switching

   Switching control schemes means activating one input action map and deactivating the other to avoid conflicts.

2. Step 2: Evaluate options

   Enabling both maps causes input conflicts; creating new actions wastes resources; ignoring schemes loses flexibility.

3. Final Answer:

   Disable the current action map and enable the other action map -> Option B

4. Quick Check:

   Switch by toggling action maps [OK]

Hint: Toggle action maps to switch control schemes [OK]

Common Mistakes:

• Enabling multiple action maps causing input conflicts
• Recreating actions unnecessarily
• Ignoring control scheme differences