HorizontalTableView

#import "ViewController.h"
#import "LyTableViewController.h"

@interface ViewController ()<UITableViewDelegate, UITableViewDataSource>
{
    UITableView *_tableView;
    NSMutableArray *_vcArray;
    NSMutableArray *_btnArray;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [self configUI];
}

#pragma mark - configUI

- (void)configUI {
    
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 64, self.view.frame.size.width, 40)];
    _btnArray = [NSMutableArray array];
    NSArray *titles = @[@"头条", @"娱乐", @"热点", @"体育"];
    for (NSInteger i = 0; i < titles.count; i ++) {

        UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
        btn.frame = CGRectMake(i * self.view.frame.size.width / titles.count, 0, self.view.frame.size.width / titles.count, 40);
        [btn setTitle:titles[i] forState:UIControlStateNormal];
        [btn setTitleColor:[UIColor colorWithRed:0.8 green:0.8 blue:0.8 alpha:1.0] forState:UIControlStateNormal];

        if (i == 0) {
            [btn setTitleColor:[UIColor colorWithRed:0.8 green:0 blue:0 alpha:1.0] forState:UIControlStateNormal];
        }

        btn.tag = 1000 + i;
        btn.titleLabel.font = [UIFont systemFontOfSize:15];
        [btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
        [view addSubview:btn];
        [_btnArray addObject:btn];
    }
    [self.view addSubview:view];
    
    _vcArray = [NSMutableArray array];

    for (NSInteger i = 0; i < _btnArray.count; i ++) {
        LyTableViewController *lytabVc = [[LyTableViewController alloc] init];
        lytabVc.index = i;
        lytabVc.stringstring = titles[i];
        [_vcArray addObject:lytabVc];
        [self addChildViewController:lytabVc];
    }

    self.automaticallyAdjustsScrollViewInsets = NO;
    _tableView = [[UITableView alloc] init];
    _tableView.pagingEnabled = YES;
    _tableView.bounces = NO;

    // 去除分割线
    _tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
    _tableView.transform = CGAffineTransformMakeRotation(-M_PI_2);
    _tableView.frame = CGRectMake(0, 64 + 40, self.view.frame.size.width, self.view.frame.size.height - 64 - 40);
    _tableView.showsVerticalScrollIndicator = NO;
    _tableView.delegate = self;
    _tableView.dataSource = self;
    [_tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cellId"];
    [self.view addSubview:_tableView];
}

- (void)btnClick:(UIButton *)btn {
    NSLog(@"haha");
    // 第btnNum个btn
//    NSInteger btnNum = btn.tag - 1000;
}

#pragma mark - UITableViewDataSource, UITableViewDelegate
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return _vcArray.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *cellId = @"cellId";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellId forIndexPath:indexPath];
    cell.selectionStyle = UITableViewCellSelectionStyleNone;
    cell.transform = CGAffineTransformMakeRotation(M_PI_2);
//    cell.textLabel.text = [NSString stringWithFormat:@"%ld, %ld", (long)indexPath.section, (long)indexPath.row];

    for (UIView *view in cell.contentView.subviews) {
        [view removeFromSuperview];
    }

    LyTableViewController *lyTabVc = _vcArray[indexPath.row];
    lyTabVc.view.frame = cell.contentView.bounds;
    [cell.contentView addSubview:lyTabVc.view];
    return cell;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return self.view.frame.size.width;
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    // tableView偏移量
    CGFloat horizontalOffset = scrollView.contentOffset.y;
    // 屏幕宽度
    CGFloat screenWidth = self.view.frame.size.width;
    // 比例
    CGFloat offsetRatio = (NSInteger)horizontalOffset % (NSInteger)screenWidth / screenWidth;
    // 当前页
    NSInteger curIndex = (horizontalOffset + screenWidth / 2) / screenWidth;

    // 过滤滚动结束
    if (curIndex * screenWidth != horizontalOffset) {
        NSInteger animateIndex = horizontalOffset > curIndex * screenWidth ? curIndex + 1 : curIndex - 1;

        if (curIndex > animateIndex) {
            offsetRatio = 1 - offsetRatio;
        }

        UIButton *curBtn = _btnArray[curIndex];
        UIButton *animateBtn = _btnArray[animateIndex];
        [curBtn setTitleColor:[UIColor colorWithRed:0.8 green:0.8 * offsetRatio blue:0.8 * offsetRatio alpha:1.0] forState:UIControlStateNormal];
        [animateBtn setTitleColor:[UIColor colorWithRed:0.8 green:0.8 * (1 - offsetRatio) blue:0.8 * (1 - offsetRatio) alpha:1.0] forState:UIControlStateNormal];
    }
}

@end