复杂首页结构

#import <UIKit/UIKit.h>
#import "JXCategoryBaseView.h"

#define WindowsSize [UIScreen mainScreen].bounds.size

@interface ViewController : UIViewController

@property (nonatomic, strong) JXCategoryBaseView *categoryView;

@property (nonatomic, strong) UIScrollView *scrollView;


- (Class)preferredCategoryViewClass;

- (NSUInteger)preferredListViewCount;

- (CGFloat)preferredCategoryViewHeight;

@end

#import "ViewController.h"
#import "JXCategoryTitleView.h"
#import "VerticalViewController.h"

@interface ViewController ()<JXCategoryViewDelegate>

@property (nonatomic, strong) NSArray *titles;
@property (nonatomic, strong) JXCategoryTitleView *myCategoryView;

@end

@implementation ViewController

- (void)viewDidLoad {
    _titles = @[@"螃蟹", @"麻辣小龙虾", @"苹果", @"营养胡萝卜", @"葡萄", @"美味西瓜", @"香蕉", @"香甜菠萝", @"鸡肉", @"鱼", @"海星"];
    [super viewDidLoad];
    
    self.myCategoryView.titles = self.titles;
    
    self.view.backgroundColor = [UIColor whiteColor];
    self.edgesForExtendedLayout = UIRectEdgeNone;
    
    CGFloat naviHeight = 64;
    if (@available(iOS 11.0, *)) {
        if (WindowsSize.height == 812) {
            naviHeight = [UIApplication sharedApplication].keyWindow.safeAreaInsets.top + 44;
        }
    }
    
    NSUInteger count = [self preferredListViewCount];
    CGFloat categoryViewHeight = [self preferredCategoryViewHeight];
    CGFloat width = WindowsSize.width;
    CGFloat height = WindowsSize.height - naviHeight - categoryViewHeight;
    self.scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, categoryViewHeight, width, height)];
    self.scrollView.pagingEnabled = YES;
    self.scrollView.contentSize = CGSizeMake(width*count, height);
    [self.view addSubview:self.scrollView];
    
    for (int i = 0; i < count; i ++) {
        VerticalViewController *listVC = [[VerticalViewController alloc] init];
        [self addChildViewController:listVC];
        listVC.view.frame = CGRectMake(i*width, 0, width, height);
        [self.scrollView addSubview:listVC.view];
    }
    
    self.categoryView.frame = CGRectMake(0, 0, WindowsSize.width, categoryViewHeight);
    self.categoryView.delegate = self;
    self.categoryView.contentScrollView = self.scrollView;
    
    [self.view addSubview:self.categoryView];
}

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    
    self.navigationController.interactivePopGestureRecognizer.enabled = (self.categoryView.selectedIndex == 0);
}

- (JXCategoryTitleView *)myCategoryView {
    return (JXCategoryTitleView *)self.categoryView;
}

- (NSUInteger)preferredListViewCount {
    return self.titles.count;
}

- (Class)preferredCategoryViewClass {
    return [JXCategoryTitleView class];
}

- (JXCategoryBaseView *)categoryView {
    if (_categoryView == nil) {
        _categoryView = [[[self preferredCategoryViewClass] alloc] init];
    }
    return _categoryView;
}

- (CGFloat)preferredCategoryViewHeight {
    return 50;
}

#pragma mark - JXCategoryViewDelegate

- (void)categoryView:(JXCategoryBaseView *)categoryView didSelectedItemAtIndex:(NSInteger)index {
    [self.scrollView setContentOffset:CGPointMake(self.scrollView.bounds.size.width*index, 0) animated:YES];
    //侧滑手势处理
    self.navigationController.interactivePopGestureRecognizer.enabled = (index == 0);
}

@end