Class InputActionAsset

An asset containing action maps and control schemes.

Inheritance
System.Object
InputActionAsset
Namespace: UnityEngine.InputSystem
Syntax
public class InputActionAsset : ScriptableObject, IInputActionCollection, IEnumerable<InputAction>, IEnumerable
Remarks

Usually imported from JSON using .

Be aware that input action assets do not separate between static (configuration) data and dynamic (instance) data. For audio, for example, represents the static, shared data portion of audio playback whereas represents the dynamic, per-instance audio playback portion (referencing the clip through .

For input, such a split is less beneficial as the same input is generally not exercised multiple times in parallel. Keeping both static and dynamic data together simplifies using the system.

However, there are scenarios where you indeed want to take the same input action and exercise it multiple times in parallel. A prominent example of such a use case is local multiplayer where each player gets the same set of actions but is controlling them with a different device (or devices) each. This is easily achieved by simply instantiating the input action asset multiple times.

Note also that all action maps in an asset share binding state. This means that if one map in an asset has to resolve its bindings, all maps in the asset have to.

Fields

Extension

Declaration
public const string Extension = "inputactions"
Field Value
Type Description
System.String

Properties

actionMaps

List of action maps defined in the asset.

Declaration
public ReadOnlyArray<InputActionMap> actionMaps { get; }
Property Value
Type Description
ReadOnlyArray<InputActionMap>
See Also

bindingMask

Optional mask applied to all bindings in the collection.

Declaration
public InputBinding? bindingMask { get; set; }
Property Value
Type Description
System.Nullable<InputBinding>
Implements
Remarks

If this is not null, only bindings that match the mask will be used.

controlSchemes

List of control schemes defined in the asset.

Declaration
public ReadOnlyArray<InputControlScheme> controlSchemes { get; }
Property Value
Type Description
ReadOnlyArray<InputControlScheme>
Implements
See Also

devices

Devices to use with the actions in this collection.

Declaration
public ReadOnlyArray<InputDevice>? devices { get; set; }
Property Value
Type Description
System.Nullable<ReadOnlyArray<InputDevice>>
Implements
Remarks

If this is set, actions in the collection will exclusively bind to devices in the given list. For example, if two gamepads are present in the system yet only one gamepad is listed here, then a "<Gamepad>/leftStick" binding will only bind to the gamepad in the list and not to the one that is only available globally.

enabled

True if any action in the asset is currently enabled.

Declaration
public bool enabled { get; }
Property Value
Type Description
System.Boolean
See Also

Item[String]

Declaration
public InputAction this[string actionNameOrId] { get; }
Parameters
Type Name Description
System.String actionNameOrId
Property Value
Type Description
InputAction

Methods

AddActionMap(InputActionMap)

Add an action map to the asset.

Declaration
public void AddActionMap(InputActionMap map)
Parameters
Type Name Description
InputActionMap map

A named action map.
Exceptions
Type Condition
System.ArgumentNullException

map is null.
System.InvalidOperationException

map has no name or asset already contains a map with the same name.

AddControlScheme(InputControlScheme)

Declaration
public void AddControlScheme(InputControlScheme controlScheme)
Parameters
Type Name Description
InputControlScheme controlScheme

Contains(InputAction)

Declaration
public bool Contains(InputAction action)
Parameters
Type Name Description
InputAction action
Returns
Type Description
System.Boolean
Implements

Disable()

Declaration
public void Disable()
Implements

Enable()

Declaration
public void Enable()
Implements

FindAction(String)

Find an InputAction by its name in of of the InputActionMap in the asset.

Declaration
public InputAction FindAction(string actionNameOrId)
Parameters
Type Name Description
System.String actionNameOrId

Name of the action as either a "map/action" combination (e.g. "gameplay/fire") or a simple name. In the former case, the name is split at the '/' slash and the first part is used to find a map with that name and the second part is used to find an action with that name inside the map. In the latter case, all maps are searched in order and the first action that has the given name in any of the maps is returned. Note that name comparisons are case-insensitive.

Alternatively, the given string can be a GUID as given by id.
Returns
Type Description
InputAction

The action with the corresponding name or null if no matching action could be found.
Remarks

Does not allocate.

Examples
var asset = ScriptableObject.CreateInstance<InputActionAsset>();

var map1 = new InputActionMap("map1");
var map2 = new InputActionMap("map2");

asset.AddActionMap(map1);
asset.AddActionMap(map2);

var action1 = map1.AddAction("action1");
var action2 = map1.AddAction("action2");
var action3 = map2.AddAction("action3");

// Search all maps in the asset for any action that has the given name.
asset.FindAction("action1") // Returns action1.
asset.FindAction("action2") // Returns action2
asset.FindAction("action3") // Returns action3.

// Search for a specific action in a specific map.
asset.FindAction("map1/action1") // Returns action1.
asset.FindAction("map2/action2") // Returns action2.
asset.FindAction("map3/action3") // Returns action3.

Search by unique action ID.
asset.FindAction(action1.id.ToString()) // Returns action1.
asset.FindAction(action2.id.ToString()) // Returns action2.
asset.FindAction(action3.id.ToString()) // Returns action3.
Exceptions
Type Condition
System.ArgumentNullException

actionNameOrId is null or empty.

FromJson(String)

Declaration
public static InputActionAsset FromJson(string json)
Parameters
Type Name Description
System.String json
Returns
Type Description
InputActionAsset

GetActionMap(Guid)

Declaration
public InputActionMap GetActionMap(Guid id)
Parameters
Type Name Description
System.Guid id
Returns
Type Description
InputActionMap

GetActionMap(String)

Declaration
public InputActionMap GetActionMap(string name)
Parameters
Type Name Description
System.String name
Returns
Type Description
InputActionMap

GetControlScheme(String)

Declaration
public InputControlScheme GetControlScheme(string name)
Parameters
Type Name Description
System.String name
Returns
Type Description
InputControlScheme

GetControlSchemeIndex(String)

Declaration
public int GetControlSchemeIndex(string name)
Parameters
Type Name Description
System.String name
Returns
Type Description
System.Int32

GetEnumerator()

Declaration
public IEnumerator<InputAction> GetEnumerator()
Returns
Type Description
System.Collections.Generic.IEnumerator<InputAction>

LoadFromJson(String)

Replace the contents of the asset with the data in the given JSON string.

Declaration
public void LoadFromJson(string json)
Parameters
Type Name Description
System.String json

RemoveActionMap(String)

Declaration
public void RemoveActionMap(string nameOrId)
Parameters
Type Name Description
System.String nameOrId

RemoveActionMap(InputActionMap)

Declaration
public void RemoveActionMap(InputActionMap map)
Parameters
Type Name Description
InputActionMap map

RemoveControlScheme(String)

Declaration
public void RemoveControlScheme(string name)
Parameters
Type Name Description
System.String name

ToJson()

Return a JSON representation of the asset.

Declaration
public string ToJson()
Returns
Type Description
System.String

A string in JSON format that represents the static/configuration data present in the asset.
Remarks

This will not save dynamic execution state such as callbacks installed on InputAction or enabled/disabled states of individual maps and actions.

Use LoadFromJson(String) to deserialize the JSON data back into an InputActionAsset.

TryGetAction(Guid)

Declaration
public InputAction TryGetAction(Guid guid)
Parameters
Type Name Description
System.Guid guid
Returns
Type Description
InputAction

TryGetActionMap(Guid)

Declaration
public InputActionMap TryGetActionMap(Guid id)
Parameters
Type Name Description
System.Guid id
Returns
Type Description
InputActionMap

TryGetActionMap(String)

Declaration
public InputActionMap TryGetActionMap(string nameOrId)
Parameters
Type Name Description
System.String nameOrId
Returns
Type Description
InputActionMap

TryGetControlScheme(String)

Declaration
public InputControlScheme? TryGetControlScheme(string name)
Parameters
Type Name Description
System.String name
Returns
Type Description
System.Nullable<InputControlScheme>

TryGetControlSchemeIndex(String)

Declaration
public int TryGetControlSchemeIndex(string name)
Parameters
Type Name Description
System.String name
Returns
Type Description
System.Int32

Extension Methods