多表视图滑动切换（类似今日头条）

思路

1. 导航条下面放一个滑动条sliderScrollView，sliderScrollView内部顺序摆放标题按钮。sliderScrollView下面放一个contentScrollView，contentScrollView内部顺序摆放内容视图view，view与屏幕齐宽，view数量与标题的数量相等。
2. 选中的标题位置居中、文字颜色为红色
3. 红色的下标移动到选中标题的下面
4. 选中某一标题，内容视图切换到对应的view
5. 切换内容视图的同时切换选中的按钮

效果

020BA2E9-EAB2-41C6-889A-34BD6037BA26.png

代码

#import "XSMultilistSlideController.h"

#define SCREEN_WIDTH [UIScreen mainScreen].bounds.size.width
#define SCREEN_HEIGHT [UIScreen mainScreen].bounds.size.height
#define SLIDER_HEIGHT 50 // 滑动条高度
#define STAANDNAV_HEIGHT 64 // 状态栏加导航栏的高度
#define BUTTON_WIDTH 80 // 按钮的宽度
#define TIPVIEW_HEIGHT 3 // 标识条的高度
#define LINE_HEIGHT 0.5 // 滑动条底部线条高度

@interface XSMultilistSlideController ()  {
    UIView *_tipView;
    UIScrollView *_sliderScrollView;
    UIScrollView *_contentScrollView;
}

@property (nonatomic, strong) NSMutableArray *dataArray;

@end

@implementation XSMultilistSlideController

- (NSMutableArray *)dataArray {
    if (!_dataArray) {
        _dataArray = [NSMutableArray array];
        for (int i = 0; i < 20; i++) {
            NSString *str = [NSString stringWithFormat:@"标题%d", i];
            [_dataArray addObject:str];
        }
    }
    return _dataArray;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor whiteColor];
    self.navigationItem.title = @"多表视图滑动切换";
    self.automaticallyAdjustsScrollViewInsets = NO;
    
    [self setupUI];
}

- (void)setupUI {
    // 滑动条
    _sliderScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, STAANDNAV_HEIGHT, [UIScreen mainScreen].bounds.size.width, SLIDER_HEIGHT)];
    _sliderScrollView.showsHorizontalScrollIndicator = NO;
    _sliderScrollView.contentSize = CGSizeMake(BUTTON_WIDTH * self.dataArray.count, SLIDER_HEIGHT);
    [self.view addSubview:_sliderScrollView];
    
    // 滑动条上的按钮
    for (int i = 0; i < self.dataArray.count; i++) {
        UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
        button.frame = CGRectMake(BUTTON_WIDTH * i, 0, BUTTON_WIDTH, SLIDER_HEIGHT);
        [button setTitle:[self.dataArray objectAtIndex:i] forState:UIControlStateNormal];
        [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
        [button setTitleColor:[UIColor redColor] forState:UIControlStateSelected];
        [button addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
        [_sliderScrollView addSubview:button];
        button.tag = i + 1;
        
        // 设置起始的选中状态
        if (i == 0) {
            button.selected = YES;
        } else {
            button.selected = NO;
        }
        
    }
    
    // 滑动条底部线条
    UIView *line = [[UIView alloc] initWithFrame:CGRectMake(0, STAANDNAV_HEIGHT + SLIDER_HEIGHT - LINE_HEIGHT, SCREEN_WIDTH, LINE_HEIGHT)];
    line.backgroundColor = [UIColor lightGrayColor];
    [self.view addSubview:line];
    
    // 按钮下面的标识条
    _tipView = [[UIView alloc] initWithFrame:CGRectMake(0, SLIDER_HEIGHT - TIPVIEW_HEIGHT, BUTTON_WIDTH, TIPVIEW_HEIGHT)];
    _tipView.backgroundColor = [UIColor redColor];
    [_sliderScrollView addSubview:_tipView];
    
    // 内容视图
    _contentScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, STAANDNAV_HEIGHT + SLIDER_HEIGHT, SCREEN_WIDTH, SCREEN_HEIGHT - (STAANDNAV_HEIGHT + SLIDER_HEIGHT))];
    _contentScrollView.contentSize = CGSizeMake(SCREEN_WIDTH * self.dataArray.count, SCREEN_HEIGHT - (STAANDNAV_HEIGHT + SLIDER_HEIGHT));
    _contentScrollView.pagingEnabled = YES;
    _contentScrollView.showsHorizontalScrollIndicator = NO;
    _contentScrollView.delegate = self;
    [self.view addSubview:_contentScrollView];
    
    // 每个页面添加一个view
    for (int i = 0; i < self.dataArray.count; i++) {
        UIView *view = [[UIView alloc] initWithFrame:CGRectMake(i * SCREEN_WIDTH, 0, SCREEN_WIDTH, SCREEN_HEIGHT - (STAANDNAV_HEIGHT + SLIDER_HEIGHT))];
        [_contentScrollView addSubview:view];
        
        if (i % 3 == 0) {
            view.backgroundColor = [UIColor cyanColor];
        } else if (i %3 == 1) {
            view.backgroundColor = [UIColor whiteColor];
        } else {
            view.backgroundColor = [UIColor yellowColor];
        }
    }
}

// 按钮点击事件
- (void)btnClick:(UIButton *)btn {
    // 1.将标识条移到选中的按钮下
    [self moveTipview:btn];
    
    // 2.将选中的按钮字体变色
    [self changeBtnColor:btn];
    
    // 3.将选中的按钮移到中间
    [self moveSlider:btn];
    
    // 4.将�内容视图调整到对应的页面
    [self moveContentScrollView:btn];
}

- (void)moveSlider:(UIButton *)btn {
    CGPoint contentOffset = _sliderScrollView.contentOffset;
    contentOffset.x += (btn.frame.origin.x + BUTTON_WIDTH / 2) - _sliderScrollView.contentOffset.x - SCREEN_WIDTH / 2;
    
    if (contentOffset.x < 0) {
        contentOffset.x = 0;
    }
    
    if (contentOffset.x + SCREEN_WIDTH > _sliderScrollView.contentSize.width) {
        contentOffset.x = _sliderScrollView.contentSize.width - SCREEN_WIDTH;
    }
    
    [UIView animateWithDuration:0.5f animations:^{
        _sliderScrollView.contentOffset = contentOffset;
    }];

}

- (void)changeBtnColor:(UIButton *)btn {
    for (UIView *view in _sliderScrollView.subviews) {
        for (int i = 1; i <= self.dataArray.count; i++) {
            if (view.tag == i) {
                UIButton *elseBtn = (UIButton *)view;
                btn.selected = YES;
                elseBtn.selected = NO;
            }
        }
    }
    
}

- (void)moveTipview:(UIButton *)btn {
    [UIView animateWithDuration:0.1f animations:^{
        CGRect frame = _tipView.frame;
        frame.origin.x = btn.frame.origin.x;
        _tipView.frame = frame;
    }];
}

- (void)moveContentScrollView:(UIButton *)btn {
    CGPoint contentOffset = _contentScrollView.contentOffset;
    contentOffset.x = (btn.tag - 1) * SCREEN_WIDTH;
    [UIView animateWithDuration:0.1f animations:^{
        _contentScrollView.contentOffset = contentOffset;
    }];
}

#pragma mark - UIScrollViewDelegate
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
    int index = scrollView.contentOffset.x / SCREEN_WIDTH + 1;
    
    for (UIView *view in _sliderScrollView.subviews) {
        if (view.tag == index) {
            UIButton *button = (UIButton *)view;
            
            // 1.将标识条移到选中的按钮下
            [self moveTipview:button];
            
            // 2.将选中的按钮字体变色
            [self changeBtnColor:button];
            
            // 3.将选中的按钮移到中间
            [self moveSlider:button];
        }
    }
    
}

@end