Модель Django с 2 внешними ключами от той же таблицы

Ваш игрок начинает с направления в touchesBegan и останавливает его на touchesEnded. Проблема в том, что вы не обрабатываете изменения направления на touchesMoves.

Давайте создадим глобальную переменную, которая сообщит нам, если мы изменили направление.

var previous_direction : Int = -1 // idle state

В функции касаний добавьте поведение previous_direction.

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    for touch in (touches as! Set<UITouch>) {

        // we start with previous_direction being the start direction

        if upRect.contains(location) {
            previous_direction = 0  // up
        } else if rightRect.contains(location) {
            previous_direction = 1  // right
        } else if downRect.contains(location) {
            previous_direction = 2  // down
        } else if leftRect.contains(location) {
            previous_direction = 3  // left
        }
    }
}

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
    for touch in (touches as! Set<UITouch>) {

        // we create a current_direction also
        var current_direction : Int = -1

        // get current_direction 
        if upRect.contains(location) {
            current_direction = 0 // up
        } else if rightRect.contains(location) {
            current_direction = 1 // right
        } else if downRect.contains(location) {
            current_direction = 2 // down
        } else if leftRect.contains(location) {
            current_direction = 0 // left
        }

        // now we compare if the current_direction is different from previous_direction
        if current_direction != previous_direction
        {
             player.removeAllActions()

             // attribute new direction
             if current_direction == 0 {
                   playerSprite.walkUpPlayer()
             } else if current_direction == 1 {
                   walkLRPlayer.walkLRPlayer()
             } else if current_direction == 2 {
                   walkLRPlayer.walkDownPlayer()
             } else if current_direction == 3 {
                   walkLRPlayer.walkLRPlayer() } 

             // we prepare previous_direction for the next time he enters this function
             previous_direction = current_direction  
        }
    }
 }

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    // reset previous_direction
    previous_direction = - 1 // idle state
}