CATransform3D透视图不工作于CATransformLayer

Question

注意:请忽略颜色，渐变和大小！我关心的是透视图不像预期的那样工作，

我正试着像下面这样实现输出，

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但是，当我运行我的代码时，它给了我以下输出

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请看一下我的代码：

CATransformLayer *baseLayer = [CATransformLayer layer];
baseLayer.anchorPoint = CGPointZero;
baseLayer.bounds = self.view.bounds;
baseLayer.position = CGPointMake(CGRectGetMidX(self.view.bounds), CGRectGetMidY(self.view.bounds));

[self.view.layer addSublayer:baseLayer];

CALayer *redLayer = [CALayer layer];
redLayer.backgroundColor = [UIColor redColor].CGColor;
redLayer.frame = CGRectMake(0, 0, 100, 100);
redLayer.position = CGPointMake(0,0);
redLayer.anchorPoint = CGPointMake(1, 0.5); // right
[baseLayer addSublayer:redLayer];

CALayer *blueLayer = [CALayer layer];
blueLayer.backgroundColor = [UIColor blueColor].CGColor;
blueLayer.bounds = CGRectMake(0, 0, 600, 100);
blueLayer.anchorPoint = CGPointMake(1, 0.5); // right
blueLayer.position = CGPointMake(-50,0);
[baseLayer addSublayer:blueLayer];

CATransform3D transform = CATransform3DIdentity;
transform.m34 = -1/80;
transform = CATransform3DRotate(transform, -M_PI_2, 0, 1, 0);
blueLayer.transform = transform;

baseLayer.sublayerTransform = CATransform3DRotate(CATransform3DIdentity, degreesToRadians(80), 0, 1, 0);

Answer 1

我不知道是什么使这个问题得到解决，但这是我更新的代码，它正在按预期工作。

CATransformLayer *baseLayer = [CATransformLayer layer];
baseLayer.anchorPoint = CGPointZero;
baseLayer.bounds = self.view.bounds;
baseLayer.position = CGPointMake(CGRectGetMidX(self.view.bounds), CGRectGetMidY(self.view.bounds));

CALayer *redLayer = [CALayer layer];
redLayer.backgroundColor = [UIColor redColor].CGColor;
redLayer.frame = CGRectMake(0, 0, 1000, 250);
redLayer.position = CGPointMake(0,0);
redLayer.anchorPoint = CGPointMake(0, 0.5); // right
redLayer.transform = CATransform3DRotate(CATransform3DIdentity, M_PI_2,0.0f, 1.0f, 0.0f);
[baseLayer addSublayer:redLayer];

CALayer *blueLayer = [CALayer layer];
blueLayer.backgroundColor = [UIColor blueColor].CGColor;
blueLayer.bounds = CGRectMake(0, 0, 125, 250);
blueLayer.anchorPoint = CGPointMake(0, 0.5); // right
blueLayer.position = CGPointMake(0,0);
[baseLayer addSublayer:blueLayer];

CGFloat perspective = -1000.0; //This relates to the m34 perspective matrix.

CATransform3D rotationAndPerspectiveTransform = CATransform3DIdentity;
rotationAndPerspectiveTransform.m34 = 1.0 / perspective;
rotationAndPerspectiveTransform = CATransform3DRotate(newTransform, degreesToRadians(10) , 0.0f, 1.0f, 0.0f);


baseLayer.sublayerTransform = rotationAndPerspectiveTransform;