view可以跟随滑动，且滑过一定高度固定在头部

来源：互联网发布：下载手机加速软件编辑：程序博客网时间：2024/04/30 10:02
下载地址Demo下载
- (void)viewDidLoad {    [super viewDidLoad];    [self loadData];    //创建TableView    [self createTableView];}//创建数据源- (void)loadData{    dataArray=[[NSMutableArray alloc]init];    for (int i = 0; i < 30; i++) {        NSString * string=[NSString stringWithFormat:@"第%d行",i];        [dataArray addObject:string];    }}- (UIView *)headIView{    if (!headView) {        headView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, WIDTH, 240)];        headView.backgroundColor = [UIColor greenColor];        //图片        UIImageView *img_view = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, WIDTH, 200)];        img_view.image = [UIImage imageNamed:@"1.jpg"];        img_view.backgroundColor = [UIColor redColor];        [headView addSubview:img_view];        //分类        [lbl_scroll removeFromSuperview];        lbl_scroll = [[UILabel alloc]initWithFrame:CGRectMake(0, 200, WIDTH, 40)];        lbl_scroll.text = @"我就在这了！";        lbl_scroll.backgroundColor = [UIColor cyanColor];        [headView addSubview:lbl_scroll];        return headView;    }    else    {        return nil;    }}- (void)createTableView{    if (!_tableView) {        _tableView=[[UITableView alloc]initWithFrame:CGRectMake(0, 64, WIDTH, HEIGHT-64) style:UITableViewStylePlain];        _tableView.backgroundColor=[UIColor clearColor];        _tableView.showsVerticalScrollIndicator=NO;        _tableView.dataSource=self;        _tableView.delegate=self;        [self.view addSubview:_tableView];    }    [_tableView setTableHeaderView:[self headIView]];}- (void)scrollViewDidScroll:(UIScrollView *)scrollView{    //int contentOffsety = scrollView.contentOffset.y;    if (scrollView.contentOffset.y > 200)    {        [lbl_scroll removeFromSuperview];        lbl_scroll = [[UILabel alloc]initWithFrame:CGRectMake(0, 64, WIDTH, 40)];        lbl_scroll.text = @"我就在这了！";        lbl_scroll.backgroundColor = [UIColor cyanColor];        [self.view addSubview:lbl_scroll];    }    else    {        [lbl_scroll removeFromSuperview];        lbl_scroll = [[UILabel alloc]initWithFrame:CGRectMake(0, 200, WIDTH, 40)];        lbl_scroll.text = @"我就在这了！";        lbl_scroll.backgroundColor = [UIColor cyanColor];        [headView addSubview:lbl_scroll];    }}- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{    return 3;}- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{    return [NSString stringWithFormat:@"第%ld区",section];}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    return dataArray.count;}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{    //创建一个静态标识符  来给每一个cell 加上标记  方便我们从复用队列里面取到 名字为该标记的cell    static NSString *reusID=@"ID";    //我创建一个cell 先从复用队列dequeue 里面 用上面创建的静态标识符来取    UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:reusID];    //做一个if判断  如果没有cell  我们就创建一个新的 并且 还要给这个cell 加上复用标识符    if (!cell) {        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:reusID];    }    cell.textLabel.textColor = [UIColor magentaColor];    cell.detailTextLabel.textColor = [UIColor purpleColor];    cell.textLabel.text = [dataArray objectAtIndex:indexPath.row];    cell.detailTextLabel.text = [dataArray objectAtIndex:indexPath.row];    return cell;}
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