SKTransition transitionWithCIFilter:duration: not animating

Question

我一直在尝试在SpriteKit中创建像这样的场景之间的翻页过渡:

+ (SKTransition *)pageTurnTransition {
    float w = 768.0;
    float h = 1024.0;
    CIVector *extent = [CIVector vectorWithX:0 Y:0 Z:w W:h];
    CIImage *shadingImage = [[CIImage alloc] initWithColor:[CIColor colorWithRed:0.2 green:0.2 blue:0.2]];
    CIImage *blankImage = [[CIImage alloc] initWithColor:[CIColor colorWithRed:1 green:1 blue:1]];
    CIFilter *pageCurlFilter = [CIFilter filterWithName:@"CIPageCurlTransition"
                                          keysAndValues:
                                @"inputExtent", extent,
                                @"inputShadingImage", shadingImage,
                                @"inputBacksideImage", blankImage,
                                @"inputAngle",[NSNumber numberWithFloat: -0.2*M_PI],
                                @"inputRadius", [NSNumber numberWithFloat: 70],
                                nil
                                ];
    return [SKTransition transitionWithCIFilter:pageCurlFilter duration:1];
}

我是这样调用过渡的:

SKScene *spaceshipScene = [[SpaceshipScene alloc] initWithSize:self.size];
[[self view] presentScene:spaceshipScene transition:[HelloScene pageTurnTransition]];

问题是，过渡没有动画，它只是停留在原始场景的指定(1秒)的过渡持续时间，然后突然显示下一个场景。

有谁知道我做错了什么吗?我已经在iPad模拟器iOS 7.1中测试过了。

Answer 1

我试了你的代码，它可以重现你的问题。

这似乎是一个问题与CurlTransition。如果你使用一个内建的过渡，它可以工作:

return [SKTransition doorsCloseVerticalWithDuration:2];

你确定shadingImage不能是透明的吗?