[_handoutButton setImage: [UIImage imageNamed:IMG_PUBLIC_VideoView_Handout] forState:UIControlStateNormal];[_handoutButton setImage: [UIImage imageNamed:IMG_PUBLIC_VideoView_Handout_Cancel] forState:UIControlStateSelected];
[_handoutButton addTarget:self action:@selector(handoutButtonAction) forControlEvents:UIControlEventTouchUpInside];

//讲义开关按钮- (void)handoutButtonAction{        if (self.isOpenHandout) {        self.isOpenHandout = NO;        [_handoutButton setSelected:NO];    }else{        self.isOpenHandout = YES;        [_handoutButton setSelected:YES];    }}