状态栏的隐藏以及再现需动画过度效果较好

- (void)viewWillDisappear:(BOOL)animated
{
    [self.navigationController
setNavigationBarHidden:NO
animated:animated];
}
- (void)viewWillAppear:(BOOL)animated
{
    [self.navigationController
setNavigationBarHidden:YES
animated:animated];
}

引导页的UIScrollView 用  JT3DScrollView 滑动界面漂亮（pod search 'JT3DScrollView'）
初始化时：
self.scrollView.effect =
JT3DScrollViewEffectCards;
    self.scrollView.delegate =
self;
往 JT3DScrollView 上面添加图片就OK了。

/**
 *  更换自定义pageControl
 */

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    
    self.pageControlImage.image = [UIImage
imageNamed:[NSString
stringWithFormat:@"%d_footprints",(int)(self.scrollView.contentOffset.x
/ SCREEN_WIDTH + .5) +
1]];
}