iOS动画特效之立方体翻转

//*******添加scrollView*******
  [self createScrollView];

//******创建立方体视图组******
  [self createCubicViewArray];

//添加视图到scrollView上
  for (int i=0; i<_viewArray.count; i++) {

    UIImageView *transView=_viewArray[i];

    //视图在scrollView上对应的位置
    transView.x=self.view.bounds.size.width * i;

#pragma mark - scrollView滑动事件
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{

  //当前页数
  NSInteger currentPage=_currentPage;

  //当前视图
  UIView *currentView=_viewArray[currentPage];

  //上一个视图
  UIView *lastView=nil;

  if (currentPage-1>=0) {

    lastView=_viewArray[currentPage-1];
  }

  //下一个视图控制器视图
  UIView *nextView;

  if (currentPage+1<=3) {

    nextView=_viewArray[currentPage+1];
  }

  //本次偏移距离
  CGFloat currentOffset=scrollView.contentOffset.x-currentPage*self.view.bounds.size.width;

  //本次偏移角度
  CGFloat deltaAngle=currentOffset/self.view.bounds.size.width * M_PI_2;

  //****************当前视图移动变幻***************

  //设置锚点
  currentView.layer.anchorPoint=CGPointMake(0.5, 0.5);

  //向屏幕前方移动
  CATransform3D move = CATransform3DMakeTranslation(0, 0, self.view.bounds.size.width/2);

  //旋转
  CATransform3D rotate = CATransform3DMakeRotation(-deltaAngle, 0, 1, 0);

  //平移
  CATransform3D plaintMove=CATransform3DMakeTranslation( currentOffset, 0, 0);

  //向屏幕后方移动
  CATransform3D back = CATransform3DMakeTranslation(0, 0, -self.view.bounds.size.width/2);

  //连接
  CATransform3D cOncat=CATransform3DConcat( CATransform3DConcat(move, CATransform3DConcat(rotate, plaintMove)),back);

  CATransform3D transform=CATransform3DPerspect(concat, CGPointMake(currentOffset/2, self.view.bounds.size.height), 5000.0f);

  //添加变幻特效
  currentView.layer.transform=transform;

  //****************下一个视图移动变幻***************

  //设置锚点
  nextView.layer.anchorPoint=CGPointMake(0.5, 0.5);

  //向屏幕前方移动
  CATransform3D move2 = CATransform3DMakeTranslation(0, 0, self.view.bounds.size.width/2);

  //旋转
  CATransform3D rotate2 = CATransform3DMakeRotation(-deltaAngle+M_PI_2, 0, 1, 0);

  //平移
  CATransform3D plaintMove2=CATransform3DMakeTranslation( currentOffset-self.view.bounds.size.width, 0, 0);

  //向屏幕后方移动
  CATransform3D back2 = CATransform3DMakeTranslation(0, 0, -self.view.bounds.size.width/2);

  //拼接
  CATransform3D concat2=CATransform3DConcat( CATransform3DConcat(move2, CATransform3DConcat(rotate2, plaintMove2)),back2);

  CATransform3D transform2=CATransform3DPerspect(concat2, CGPointMake(self.view.bounds.size.width/2+currentOffset/2, self.view.bounds.size.height), 5000.0f);

  //添加变幻特效
  nextView.layer.transform=transform2;

  //****************上一个视图移动变幻***************

  //设置锚点
  lastView.layer.anchorPoint=CGPointMake(0.5, 0.5);

  //向屏幕前方移动
  CATransform3D move3 = CATransform3DMakeTranslation(0, 0, self.view.bounds.size.width/2);

  //旋转
  CATransform3D rotate3 = CATransform3DMakeRotation(-deltaAngle-M_PI_2, 0, 1, 0);

  //平移
  CATransform3D plaintMove3=CATransform3DMakeTranslation( currentOffset+self.view.bounds.size.width, 0, 0);

  //向屏幕后方移动
  CATransform3D back3 = CATransform3DMakeTranslation(0, 0, -self.view.bounds.size.width/2);

  //拼接
  CATransform3D concat3=CATransform3DConcat(CATransform3DConcat(move3, CATransform3DConcat(rotate3, plaintMove3)),back3);

  CATransform3D transform3=CATransform3DPerspect(concat3, CGPointMake(-self.view.bounds.size.width/2+currentOffset/2, self.view.bounds.size.height), 5000.0f);

  //添加变幻特效
  lastView.layer.transform=transform3;
}

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{

  //改变选中页序号
  [self changeIndex];

  //3D变幻恢复原状态
  for (UIView * view in _viewArray) {

    view.layer.transform=CATransform3DIdentity;
  }
}

//3D透视函数
CATransform3D CATransform3DMakePerspective(CGPoint center, float disZ)
{
  CATransform3D transToCenter = CATransform3DMakeTranslation(-center.x, -center.y, 0);
  CATransform3D transBack = CATransform3DMakeTranslation(center.x, center.y, 0);
  CATransform3D scale = CATransform3DIdentity;
  scale.m34 = -1.0f/disZ;
  return CATransform3DConcat(CATransform3DConcat(transToCenter, scale), transBack);
}