SKShapeNode - 动画颜色变化

问题描述

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我正在使用SpriteKit进行游戏。我正在使用SKShapeNode绘制一个形状。现在我想设置其颜色变化的动画，但SKActions不适用于SKShapeNode。有没有办法做到这一点，或者我必须采用不同的方法？

I'm working on a game with SpriteKit. I'm drawing a shape with SKShapeNode. Now I want to animate its colour change but the SKActions is not working for SKShapeNode. Is there any way to do this or I have to use a different approach?

谢谢。

编辑：

感谢，我能够想出来这个快速（并且完全不完美）的解决方案。

Thanks to LearnCocos2D I was able to come up with this quick (and totally not perfect) solution.

int groundChangeInterval = 5;
SKColor *originalColor = [SKColor colorWithRed:0.92 green:0.87 blue:0.38 alpha:1.0];
SKColor *finalColor = [SKColor colorWithRed:0.29 green:0.89 blue:0.31 alpha:1.0];

CGFloat red1 = 0.0, green1 = 0.0, blue1 = 0.0, alpha1 = 0.0;
[originalColor getRed:&red1 green:&green1 blue:&blue1 alpha:&alpha1];

CGFloat red2 = 0.0, green2 = 0.0, blue2 = 0.0, alpha2 = 0.0;
[finalColor getRed:&red2 green:&green2 blue:&blue2 alpha:&alpha2];

SKAction *changeGroundColor = [SKAction customActionWithDuration:groundChangeInterval actionBlock:^(SKNode *node, CGFloat elapsedTime) {
    CGFloat step = elapsedTime/groundChangeInterval;

    CGFloat red3 = 0.0, green3 = 0.0, blue3 = 0.0;
    red3 = red1-(red1-red2)*step;
    green3 = green1-(green1-green2)*step;
    blue3 = blue1-(blue1-blue2)*step;

    [(SKShapeNode*)node setFillColor:[SKColor colorWithRed:red3 green:green3 blue:blue3 alpha:1.0]];
    [(SKShapeNode*)node setStrokeColor:[SKColor colorWithRed:red3 green:green3 blue:blue3 alpha:1.0]];
}];

我只需淡化两种特定颜色，因此它不是通用的解决方案，但现在已经足够了。

I only needed to fade two specific colours so it is not a universal solution but it is enough for now.

谢谢

推荐答案

使用 customActionWithDuration ：block：并更改 fillColor 或 strokeColor 属性。

我认为着色操作不起作用，因为SKShapeNode没有 color 属性。值得尝试将此属性添加到子类或类别中的类，并将其重定向到 fillColor 或 strokeColor 或两个。

I suppose the colorize actions won't work because SKShapeNode has no color property. It's worth a try to add this property to the class in a subclass or category and redirect it to fillColor or strokeColor or both.

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