涉及到的技術點

1. CATransform3DRotate
2. 轉換坐標系
   

整體視圖的層級結構

1. tvOSCardView
2. cardImageView
3. cardParallaxView
   

轉換坐標系的代碼

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動畫的運行結果

文／JoyceZhao（簡書作者）
原文鏈接：http://www.jianshu.com/p/42770b5cee0d
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