iOS 视图180度翻转

+ (void)transformViewController1:(UIViewController* )vc1 withViewController2:(UIViewController* )vc2{
    
    __weak typeof(UIViewController* ) weakSelf = vc1;
    [UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{

        UIWindow *window = [UIApplication sharedApplication].keyWindow;
        window.backgroundColor = [UIColor whiteColor];
        window.layer.transform = CATransform3DMakeRotation(M_PI/2.0, 0, 1, 0);
    } completion:^(BOOL finished) {
        [weakSelf presentViewController:vc2 animated:NO completion:nil];
        
        [UIView animateWithDuration:0 animations:^{
            vc2.view.layer.transform = CATransform3DMakeRotation(3*M_PI/2, 0, 1, 0);// 先将页面翻转270度。此时是你看不见这个控制器的，设置了alpha
        } completion:^(BOOL finished) {
            vc2.view.alpha = 1;
            [UIView animateWithDuration:0.5 animations:^{
                // 先将window 翻转270.
                UIWindow *window = [UIApplication sharedApplication].keyWindow;
                window.backgroundColor = [UIColor whiteColor];
                window.layer.transform = CATransform3DRotate(window.layer.transform,M_PI*3/2.0, 0, 1, 0);
                vc2.view.layer.transform = CATransform3DRotate(vc2.view.layer.transform, M_PI/2, 0, 1, 0);
            } completion:^(BOOL finished) {
            }];
        }];
    }];
}

+ (void)transformViewController2:(UIViewController* )vc2 withViewController1:(UIViewController* )vc1{
    
    __weak typeof(UIViewController* ) weakSelf = vc2;
    [UIView animateWithDuration:0.5 delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{
        
        weakSelf.view.layer.transform = CATransform3DMakeRotation(M_PI/2.0, 0, 1, 0);  // 当前view，这句代码可以不要。这是我的需求
        
        UIWindow *window = [UIApplication sharedApplication].keyWindow;
        window.backgroundColor = [UIColor whiteColor];
        window.layer.transform = CATransform3DMakeRotation(M_PI/2.0, 0, 1, 0);
    } completion:^(BOOL finished) {
        
        [weakSelf dismissViewControllerAnimated:NO completion:nil];
        
        [UIView animateWithDuration:0 animations:^{
            vc1.view.layer.transform = CATransform3DMakeRotation(3*M_PI/2, 0, 1, 0);// 先将页面翻转270度。此时是你看不见这个控制器的，设置了alpha
        } completion:^(BOOL finished) {
            vc1.view.alpha = 1;
            [UIView animateWithDuration:0.5 animations:^{
                // 先将window 翻转270.
                UIWindow *window = [UIApplication sharedApplication].keyWindow;
                window.backgroundColor = [UIColor whiteColor];
                window.layer.transform = CATransform3DRotate(window.layer.transform,M_PI*3/2.0, 0, 1, 0);
                vc1.view.layer.transform = CATransform3DRotate(vc1.view.layer.transform, M_PI/2, 0, 1, 0);
            } completion:^(BOOL finished) {
            }];
        }];
    }];
}