IOS 实现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;