UnityGame/Library/PackageCache/com.unity.inputsystem/Documentation~/PlayerInputManager.md

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input-system-player-input-manager

The Player Input Manager component

NOTE: The Input System package comes with a sample called Simple Multiplayer which you can install from the package manager UI in the Unity editor. The sample demonstrates how to use PlayerInputManager to set up a simple local multiplayer scenario.

The Player Input system facilitates setting up local multiplayer games, where multiple players share a single screen and multiple controllers. You can set this up using the PlayerInputManager component, which automatically manages the creation and lifetime of PlayerInput instances as players join and leave the game.

Property	Description
Notification Behavior	How the PlayerInputManager component notifies game code about changes to the connected players. This works the same way as for the PlayerInput component.
Join Behavior	Determines the mechanism by which players can join when joining is enabled. See documentation on join behaviors.
Player Prefab	A prefab that represents a player in the game. The PlayerInputManager component creates an instance of this prefab whenever a new player joins. This prefab must have one PlayerInput component in its hierarchy.
Joining Enabled By Default	While this is enabled, new players can join via the mechanism determined by Join Behavior.
Limit Number of Players	Enable this if you want to limit the number of players who can join the game.
Max Player Count(Only shown when Limit number of Players is enabled.)	The maximum number of players allowed to join the game.
Enable Split-Screen	If enabled, each player is automatically assigned a portion of the available screen area. See documentation on split-screen multiplayer.

Join behaviors

You can use the Join Behavior property in the Inspector to determine how a PlayerInputManager component decides when to add new players to the game. The following options are available to choose the specific mechanism that PlayerInputManager employs.

Behavior	Description
Join Players When Button IsPressed	Listen for button presses on Devices that are not paired to any player. If a player presses a button and joining is allowed, join the new player using the Device they pressed the button on.
Join Players When Join Action Is Triggered	Similar to Join Players When Button IsPressed, but this only joins a player if the control they triggered matches a specific action you define. For example, you can set up players to join when pressing a specific gamepad button.
Join Players Manually	Don't join players automatically. Call JoinPlayer explicitly to join new players. Alternatively, create GameObjects with PlayerInput components directly and the Input System will automatically join them.

Split-screen

If you enable the Split-Screen option, the PlayerInputManager automatically splits the available screen space between the active players. For this to work, you must set the Camera property on the PlayerInput prefab. The PlayerInputManager then automatically resizes and repositions each camera instance to let each player have their own part of the screen.

If you enable the Split-Screen option, you can configure the following additional properties in the Inspector:

Property	Description
Maintain Aspect Ratio	A false value enables the game to produce screen areas that have an aspect ratio different from the screen resolution when subdividing the screen.
Set Fixed Number	If this value is greater than zero, the PlayerInputManager always splits the screen into a fixed number of rectangles, regardless of the actual number of players.
Screen Rectangle	The normalized screen rectangle available for allocating player split-screens into.

By default, any player in the game can interact with any UI elements. However, in split-screen setups, your game can have screen-space UIs that are restricted to just one specific camera. See the UI Input section on the Player Input component page on how to set this up using the Player Input component, InputSystemUIInputModule and MultiplayerEventSystem components.

PlayerInputManager notifications

PlayerInputManager sends notifications when something notable happens with the current player setup. These notifications are delivered according to the Notification Behavior property, in the same way as for PlayerInput.

Your game can listen to the following notifications:

Notification	Description
PlayerJoinedMessage	A new player joined the game. Passes the [PlayerInput](PlayerInput.mdPlayerInputManager sends a Player Joined notification for each of these.
PlayerLeftMessage	A player left the game. Passes the PlayerInput instance of the player who left.