Question

我正在尝试制作一款与Jetpack Joyride略有相似的游戏。在某些点上，它将有一个玩家必须在其间飞行的物体 - 就像飞鸟上的管道一样。我已设法创建管道对象，但我希望对象在屏幕上上下移动，使玩家更难在其间跳跃。我放置对象的代码是：

// Maths
float availableSpace = HEIGHT(self) - HEIGHT(floor);
float maxVariance = availableSpace - (2*OBSTACLE_MIN_HEIGHT) - VERTICAL_GAP_SIZE;
float variance = [Math randomFloatBetween:0 and:maxVariance];

// Bottom object placement
float minBottomPosY = HEIGHT(floor) + OBSTACLE_MIN_HEIGHT - HEIGHT(self);
float bottomPosY = minBottomPosY + variance;
bottomPipe.position = CGPointMake(xPos,bottomPosY);
bottomPipe.physicsBody = [SKPhysicsBody bodyWithEdgeLoopFromRect:CGRectMake(0,0, WIDTH(bottomPipe) , HEIGHT(bottomPipe))];
bottomPipe.physicsBody.categoryBitMask = blockBitMask;
bottomPipe.physicsBody.contactTestBitMask = playerBitMask;

// Top object placement
topPipe.position = CGPointMake(xPos,bottomPosY + HEIGHT(bottomPipe) + VERTICAL_GAP_SIZE);
topPipe.physicsBody = [SKPhysicsBody bodyWithEdgeLoopFromRect:CGRectMake(0,0, WIDTH(topPipe), HEIGHT(topPipe))];

topPipe.physicsBody.categoryBitMask = blockBitMask;
topPipe.physicsBody.contactTestBitMask = playerBitMask;

我如何上下移动物体？感谢您的帮助:)）

Answer 1

节点上的所有此类操作都是使用SKAction个对象完成的。阅读SKAction课程here。

在您的情况下，使用SKAction上下移动节点将是这样的：

SKAction *actionMoveUp = [SKAction moveByX:0 y:20 duration:0.5];
SKAction *actionMoveDown = [actionMoveUp reversedAction];
SKAction *actionMoveUpDown = [SKAction sequence:@[actionMoveUp, actionMoveDown]];
SKAction *actionMoveDownRepeat = [SKAction repeatActionForever:actionMoveUpDown]; 

[bottomPipe runAction:actionMoveDownRepeat];
[topPipe runAction:actionMoveDownRepeat];

上面给出的代码会使您的上下管道反复上下移动20个像素。

iOS游戏上下移动物体

1 个答案: