UIScrollView添加多个UIViewController并滑动

UIScrollView添加多个UIViewController，并进行左右滑动，相关代码如下：

@interface DiscoverHomeViewController ()<UIScrollViewDelegate>{
    DiscoverHotViewController *_hotVc;
    DiscoverPageViewController *_discoverVc;
}
@property (strong,nonatomic) UIScrollView *scrollView;
@end

@implementation DiscoverHomeViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self initUI];
}

/* 初始化UI */
- (void) initUI{
    _scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 64, self.view.bounds.size.width,self.view.bounds.size.height - 64)];
    _scrollView.bounces = NO;
    _scrollView.showsHorizontalScrollIndicator = NO;
    _scrollView.showsVerticalScrollIndicator = NO;
    _scrollView.pagingEnabled = YES;
    _scrollView.scrollEnabled = NO;
    _scrollView.contentOffset = CGPointMake(0, 0);
    _scrollView.contentSize = CGSizeMake(_scrollView.bounds.size.width * 2, _scrollView.bounds.size.height);
    _scrollView.delegate = self;
    _scrollView.backgroundColor = [UIColor yellowColor];
    //热门页面
    _hotVc = [StoryboardUtil getVCWithSbIden:@"Discover" identify:@"DiscoverHotViewController"];
    [_hotVc.view setFrame:CGRectMake(0, 0, _scrollView.bounds.size.width, _scrollView.bounds.size.height)];
    [_scrollView addSubview:_hotVc.view];
    [self addChildViewController:_hotVc];
    //发现页面
    _discoverVc = [StoryboardUtil getVCWithSbIden:@"Discover" identify:@"DiscoverPageViewController"];
    [_discoverVc.view setFrame:CGRectMake(_scrollView.bounds.size.width, 0, _scrollView.bounds.size.width,  _scrollView.bounds.size.height)];
    [_scrollView addSubview:_discoverVc.view];
    [self addChildViewController:_discoverVc];
    //添加scrollView
    [self.view addSubview:_scrollView];
}

/* 热门 */
- (IBAction)btnHotAction:(id)sender {
    //设按钮颜色
    [self.btnDiscover setTitleColor:ContentTextColor forState:UIControlStateNormal];
    [self.btnHot setTitleColor:[ColorUtil colorFromHexRGB:@"#000000"] forState:UIControlStateNormal];
    [_scrollView setContentOffset:CGPointMake(0, 0) animated:YES];
}

/* 发现 */
- (IBAction)btnDiscoverAction:(id)sender {
    //设按钮颜色
    [self.btnDiscover setTitleColor:[ColorUtil colorFromHexRGB:@"#000000"] forState:UIControlStateNormal];
    [self.btnHot setTitleColor:ContentTextColor forState:UIControlStateNormal];
    [_scrollView setContentOffset:CGPointMake(_scrollView.bounds.size.width, 0) animated:YES];
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


@end