固体对象

“固态的3D对象（实际上是一个技术上所谓的空洞对象，但它以固态呈现）”

效果图

实现

- (void)viewDidLoad {[super viewDidLoad];CATransform3D perspective = CATransform3DIdentity;perspective.m34 = -1.0 / 500.0;//以相机角度查看  perspective = CATransform3DRotate(perspective, -M_PI_4, 1, 0, 0);perspective = CATransform3DRotate(perspective, -M_PI_4, 0, 1, 0);self.containerView.layer.sublayerTransform = perspective;//add cube face 1CATransform3D transform = CATransform3DMakeTranslation(0, 0, 50);[self addFace:0 withTransform:transform];//add cube face 2transform = CATransform3DMakeTranslation(50, 0, 0);transform = CATransform3DRotate(transform, M_PI_2, 0, 1, 0);[self addFace:1 withTransform:transform];//add cube face 3transform =  CATransform3DMakeTranslation(0, -50, 0);transform = CATransform3DRotate(transform, M_PI_2, 1, 0, 0);[self addFace:2 withTransform:transform];//add cube face 4transform = CATransform3DMakeTranslation(0, 50, 0);transform = CATransform3DRotate(transform, -M_PI_2, 1, 0, 0);[self addFace:3 withTransform:transform];//add cube face 5transform = CATransform3DMakeTranslation(-50, 0, 0);transform = CATransform3DRotate(transform, -M_PI_2, 0, 1, 0);[self addFace:4 withTransform:transform];//add cube face 6transform = CATransform3DMakeTranslation(0, 0, -50);transform = CATransform3DRotate(transform, M_PI, 0, 1, 0);[self addFace:5 withTransform:transform];// Do any additional setup after loading the view.}- (void)addFace:(NSInteger)index withTransform:(CATransform3D)transform{//get the face view and add it to the containerUIView *face = self.faces[index];[self.containerView addSubview:face];//center the face view within the containerCGSize containerSize = self.containerView.bounds.size;face.center = CGPointMake(containerSize.width / 2.0, containerSize.height / 2.0);// apply the transformface.layer.transform = transform;}

光亮和阴影

- (void)applyLightingToFace:(CALayer *)face{//add lighting layerCALayer *layer = [CALayer layer];layer.frame = face.bounds;[face addSublayer:layer];//convert the face transform to matrix//(GLKMatrix4 has the same structure as CATransform3D)//译者注：GLKMatrix4和CATransform3D内存结构一致，但坐标类型有长度区别，所以理论上应该做一次float到CGFloat的转换，感谢[@zihuyishi](https://github.com/zihuyishi)同学~CATransform3D transform = face.transform;GLKMatrix4 matrix4 = *(GLKMatrix4 *)&transform;GLKMatrix3 matrix3 = GLKMatrix4GetMatrix3(matrix4);//get face normalGLKVector3 normal = GLKVector3Make(0, 0, 1);normal = GLKMatrix3MultiplyVector3(matrix3, normal);normal = GLKVector3Normalize(normal);//get dot product with light directionGLKVector3 light = GLKVector3Normalize(GLKVector3Make(LIGHT_DIRECTION));float dotProduct = GLKVector3DotProduct(light, normal);//set lighting layer opacityCGFloat shadow = 1 + dotProduct - AMBIENT_LIGHT;UIColor *color = [UIColor colorWithWhite:0 alpha:shadow];layer.backgroundColor = color.CGColor;}

上述代码未实行效果图 GLKit框架有待学习

点击事件

将上面添加视图代码,视图3放在最后添加,避免其他视图覆盖上面,影响事件的传递,或者将上面的视图的userInteractionEnabled设置为NO