UItableview里面的header、footer

#import "ViewController.h"
#import "MJRefresh.h"
@interface ViewController ()
{
    UITableView *table;
    NSArray * arr;
    UIView * headerView;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    arr =@[@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"10",@"11",@"12",@"13",@"14",@"15",@"16",@"17",@"18",@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"10",@"11",@"12",@"13",@"14",@"15",@"16",@"17",@"18"];
    self.view.backgroundColor = [UIColor grayColor];
    UILabel * label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 200, 30)];
    label.text =@"ffff";
    label.textColor =[UIColor blackColor];
    headerView =[[UIView alloc]initWithFrame:CGRectMake(0, 64, [UIScreen mainScreen].bounds.size.width,100)];
    headerView.backgroundColor =[UIColor greenColor];
    [headerView addSubview:label];
    [self.view addSubview:headerView];
    
    
    table = [[UITableView alloc]initWithFrame:CGRectMake(0, 174, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height) style:UITableViewStylePlain];
    table.delegate = self;
    table.dataSource = self;
 
    [table.mj_header  beginRefreshing];
    table.mj_header = [MJRefreshNormalHeader headerWithRefreshingTarget:self refreshingAction:@selector(downRefresh)];

    table.backgroundColor = [UIColor cyanColor];
    [self.view addSubview:table];

}

-(void)downRefresh{
    [table.mj_header endRefreshing];

}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    return  arr.count;
}


-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 2;
}
-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    
    
    static NSString  *CellIdentifier = @"CellIdentifier";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
     if (cell == nil) {
     cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
     }
    cell.textLabel.text = arr [indexPath.row];
    return  cell;
}

//-(NSString*)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{
//    
//    return @"为什么";
//}
//


-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{
    
    return 50;
}
-(CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section{
    return 50;
}
-(UIView*)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section{
    
    if (section==0) {

    UIView * view = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 100, 50)];
    view.backgroundColor = [UIColor redColor];
    UILabel * footerlabel = [[UILabel alloc]initWithFrame:view.frame];
    footerlabel.text = @"footer1";
    footerlabel.textAlignment = NSTextAlignmentCenter;
    [view addSubview:footerlabel];
        return view;
    }
    else{
        UIView * view = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 100, 50)];
        UILabel * footerlabel = [[UILabel alloc]initWithFrame:view.frame];
        footerlabel.text = @"footer2";
        view.backgroundColor = [UIColor redColor];
        footerlabel.textAlignment = NSTextAlignmentCenter;
        [view addSubview:footerlabel];
        return view;
        
    }
}
-(UIView*)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section{
    
    if (section==0) {
        UIView *Iview =[[UIView alloc]initWithFrame:CGRectMake(0, 0, 200, 50)];
        Iview.backgroundColor =[UIColor orangeColor];
        UILabel * footerlabel = [[UILabel alloc]initWithFrame:Iview.frame];
        footerlabel.text = @"header1";
        footerlabel.textAlignment = NSTextAlignmentCenter;
        [Iview addSubview:footerlabel];
        return Iview;
    }
    else{
        UIView *Iview =[[UIView alloc]initWithFrame:CGRectMake(0, 0, 200, 50)];
        Iview.backgroundColor =[UIColor cyanColor];
        UILabel * footerlabel = [[UILabel alloc]initWithFrame:Iview.frame];
        footerlabel.text = @"header2";
        footerlabel.textAlignment = NSTextAlignmentCenter;
        [Iview addSubview:footerlabel];
        return Iview;
        
    }
    
}


-(void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    if (scrollView.tag == 100102) {
        UITableView *tableview = (UITableView *)scrollView;
        CGFloat sectionHeaderHeight = 200;
        CGFloat sectionFooterHeight = 10;
        CGFloat offsetY = tableview.contentOffset.y;
        if (offsetY >= 0 && offsetY <= sectionHeaderHeight)
        {
            tableview.contentInset = UIEdgeInsetsMake(-offsetY, 0, -sectionFooterHeight, 0);
        }else if (offsetY >= sectionHeaderHeight && offsetY <= tableview.contentSize.height - tableview.frame.size.height - sectionFooterHeight)
        {
            tableview.contentInset = UIEdgeInsetsMake(-sectionHeaderHeight, 0, -sectionFooterHeight, 0);
        }else if (offsetY >= tableview.contentSize.height - tableview.frame.size.height - sectionFooterHeight && offsetY <= tableview.contentSize.height - tableview.frame.size.height)
        {
            tableview.contentInset = UIEdgeInsetsMake(-offsetY, 0, -(tableview.contentSize.height - tableview.frame.size.height - sectionFooterHeight), 0);
        }
    }
}