模拟tvOS中的3D浮动效果动画

• 涉及到的技术点
  • CATransform3DRotate
  • 转换坐标系
• 整体视图的层级结构
  • tvOSCardView
  • cardImageView
  • cardParallaxView
• 转换坐标系的代码

CGFloat xFactor = MIN(1, MAX(-1, (touchPoint.x - (self.bounds.size.width / 2)) / (self.bounds.size.width / 2)));
CGFloat yFactor = MIN(1, MAX(-1, (touchPoint.y - (self.bounds.size.height / 2)) / (self.bounds.size.height / 2)));
        
 cardImageView.layer.transform = [self transformWithM34:1.0 / -500 xf:xFactor yf:yFactor];
 cardParallaxView.layer.transform = [self transformWithM34:1.0 / -250 xf:xFactor yf:yFactor];
        
  CGFloat zFactor = 180 * atan(yFactor / xFactor) / M_PI + 90;

• tvOSCardAnimation动画的运行结果

运行结果图8.gif