一次运行两个 SKAction

问题描述

我正在使用一个序列来运行一个 SKAction 列表.然而，我想做的是运行一个 SKAction，然后一次运行两个，然后依次运行一个.

I'm using a sequence to run a list of SKActions. What I want to do however, is run an SKAction, then run two at once, then run one in sequence.

这是我的代码:

SKNode *ballNode = [self childNodeWithName:@"ball"];

    if (ballNode != Nil){
        ballNode.name = nil;

        SKAction *delay = [SKAction waitForDuration:3];
        SKAction *scale = [SKAction scaleTo:0 duration:1];
        SKAction *fadeOut = [SKAction fadeOutWithDuration:1];
        SKAction *remove = [SKAction removeFromParent];

        //put actions in sequence
        SKAction *moveSequence = [SKAction sequence:@[delay, (run scale and fadeout at the same time), remove]];

        //run action from node (child of SKLabelNode)
        [ballNode runAction:moveSequence];
    }

我怎样才能做到这一点?我假设我不能使用序列?

How can I accomplish this? I'm assuming I can't use a sequence?

推荐答案

使用组操作.

来自精灵套件编程指南:

From sprite kit programming guide:

组动作是一组动作，一旦组执行，所有动作都开始执行.当您希望操作同步时使用组

SKSpriteNode *wheel = (SKSpriteNode*)[self childNodeWithName:@"wheel"];
CGFloat circumference = wheel.size.height * M_PI;
SKAction *oneRevolution = [SKAction rotateByAngle:-M_PI*2 duration:2.0];
SKAction *moveRight = [SKAction moveByX:circumference y:0 duration:2.0];
SKAction *group = [SKAction group:@[oneRevolution, moveRight]];
[wheel runAction:group];

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