SpriteKit - 与墙碰撞时停止对象移动

Question

我是SpriteKit的新手，我制作了简单的测试游戏，我遇到了碰撞对象的问题。

玩家必须与墙碰撞。目前玩家通过墙壁移动。以下是代码示例：

设置播放器：

SKSpriteNode *player = [SKSpriteNode spriteNodeWithImageNamed:@"player"];

player.name = playerCategoryName;

player.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:player.frame.size];
player.physicsBody.restitution = 0.1f;
player.physicsBody.friction = 0.0f;
player.physicsBody.dynamic = NO;

player.physicsBody.categoryBitMask = CollisionTypePlayer;
player.physicsBody.collisionBitMask = CollisionTypeNet ;
player.physicsBody.contactTestBitMask = CollisionTypeWall;

设置网络：

SKSpriteNode *wall = [SKSpriteNode spriteNodeWithColor:[UIColor redColor] size:CGSizeMake(20, 350)];

    wall.position = CGPointMake(CGRectGetMidX(self.frame), self.wall.frame.size.height * 0.6);
    wall.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:size];
    wall.physicsBody.dynamic = NO;
    wall.physicsBody.categoryBitMask = CollisionTypeWall;
    wall.physicsBody.contactTestBitMask = 0;
    wall.physicsBody.collisionBitMask = CollisionTypePlayer;

    [self addChild:wall];

任何帮助将不胜感激！