Simple_StateMachine_Implement.cs

Public MainPlayerController : MonoBehavior
{
	CharacterState _currentState;
	
	void Start()
	{
		_currentState = CharacterState.Walk;
	}

	void Update()
	{
		switch (_currentState)
		{
			case CharacterState.WALK:
				UpdateWalkState();
			case CharacterState.JUMP:
				UpdateJumpState();
			case CharacterState.DEAD:
				UpdateDeadState();
		}
	}
	
	void UpdateWalkState()
	{
		// checking input to move character
		if (Input.GetKey(Keycode.A)) {//...}
		if (Input.GetKey(Keycode.D)) {//...}
		
		// change state
		if (Input.GetKeyDown(Keycode.Space))
		{
			// add force to rigidbody
			rigidbody.AddForce(...);
			// change state
			_currentState = CharacterState.JUMP;
		}
	}
	
	void UpdateJumpState()
	{
		// checking onGround
		if (IsOnGround()) _currentState = CharacterState.WALK;
	}
	
	void UpdateDeadState()
	{
	}
	
	bool IsOnGround()
	{
		// Use raycast, line cast ... to know
		// if character are on Platforms or not
	}
}