1. 在屏幕旋转的动画中，需要保持播放器之外的界面布局
2. 全屏切换到小屏，小屏需要回到原先位置

- (void)enterFullscreen {
    
    if (self.movieView.state != MovieViewStateSmall) {
        return;
    }
    
    self.movieView.state = MovieViewStateAnimating;
    
    /*
     * 记录进入全屏前的parentView和frame
     */
    self.movieView.movieViewParentView = self.movieView.superview;
    self.movieView.movieViewFrame = self.movieView.frame;
    
    /*
     * movieView移到window上
     */
    CGRect rectInWindow = [self.movieView convertRect:self.movieView.bounds toView:[UIApplication sharedApplication].keyWindow];
    [self.movieView removeFromSuperview];
    self.movieView.frame = rectInWindow;
    [[UIApplication sharedApplication].keyWindow addSubview:self.movieView];
    
    /*
     * 执行动画
     */
    [UIView animateWithDuration:0.5 animations:^{
        self.movieView.transform = CGAffineTransformMakeRotation(M_PI_2);
        self.movieView.bounds = CGRectMake(0, 0, CGRectGetHeight(self.movieView.superview.bounds), CGRectGetWidth(self.movieView.superview.bounds));
        self.movieView.center = CGPointMake(CGRectGetMidX(self.movieView.superview.bounds), CGRectGetMidY(self.movieView.superview.bounds));
    } completion:^(BOOL finished) {
        self.movieView.state = MovieViewStateFullscreen;
    }];
    
    [self refreshStatusBarOrientation:UIInterfaceOrientationLandscapeRight];
}

- (void)exitFullscreen {
    
    if (self.movieView.state != MovieViewStateFullscreen) {
        return;
    }
    
    self.movieView.state = MovieViewStateAnimating;
    
    CGRect frame = [self.movieView.movieViewParentView convertRect:self.movieView.movieViewFrame toView:[UIApplication sharedApplication].keyWindow];
    [UIView animateWithDuration:0.5 animations:^{
        self.movieView.transform = CGAffineTransformIdentity;
        self.movieView.frame = frame;
    } completion:^(BOOL finished) {
        /*
         * movieView回到小屏位置
         */
        [self.movieView removeFromSuperview];
        self.movieView.frame = self.movieView.movieViewFrame;
        [self.movieView.movieViewParentView addSubview:self.movieView];
        self.movieView.state = MovieViewStateSmall;
    }];
    
    [self refreshStatusBarOrientation:UIInterfaceOrientationPortrait];
}

- (void)refreshStatusBarOrientation:(UIInterfaceOrientation)interfaceOrientation {
    [[UIApplication sharedApplication] setStatusBarOrientation:interfaceOrientation animated:YES];
}

- (BOOL)shouldAutorotate {
    return NO;
}

在iOS8.1-8.3上可以通过系统只允许竖屏来避免全屏右半边无法点击的问题;
具体做法: 在进入视频播放vc时(在viewWillAppear:)中设置-application:supportedInterfaceOrientationsForWindow:的返回值为UIInterfaceOrientationMaskAllButUpsideDown. 然后在viewWillDisappear:中设置-application:supportedInterfaceOrientationsForWindow:返回UIInterfaceOrientationMaskAllButUpsideDown;