SpriteKit的相机抖动效果 [英] A camera shake effect for SpriteKit

问题描述

有没有人知道一些开箱即用的库可能会提供一些效果，例如相机抖动到 SKNode ？

Does anyone know some out of the box libraries that might provide effects such as camera shake to an SKNode?

如果没有，是否有一种简单的方法可以使用动作实现相机抖动？

If not is there an easy way to implement a camera shake using actions?

谢谢

推荐答案

我发现了一种使用SKAction的优雅方法，可以让你的节点震动。例如，使用水平摇动：

I found an elegant method using SKAction, that make shake your node. For example, with an horizontal shake:

-(void)shake:(NSInteger)times {
    CGPoint initialPoint = self.position;
    NSInteger amplitudeX = 32;
    NSInteger amplitudeY = 2;
    NSMutableArray * randomActions = [NSMutableArray array];
    for (int i=0; i<times; i++) {
        NSInteger randX = self.position.x+arc4random() % amplitudeX - amplitudeX/2;
        NSInteger randY = self.position.y+arc4random() % amplitudeY - amplitudeY/2;
        SKAction *action = [SKAction moveTo:CGPointMake(randX, randY) duration:0.01];
        [randomActions addObject:action];
    }

    SKAction *rep = [SKAction sequence:randomActions];

    [self runAction:rep completion:^{
        self.position = initialPoint;
    }];
}

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