////  ImageCell.h//  TableView////  Created by YouXianMing on 15/2/1.//  Copyright (c) 2015年 YouXianMing. All rights reserved.//#import <UIKit/UIKit.h>@interface ImageCell : UITableViewCell@end

////  ImageCell.m//  TableView////  Created by YouXianMing on 15/2/1.//  Copyright (c) 2015年 YouXianMing. All rights reserved.//#import "ImageCell.h"@implementation ImageCell- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {    if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {        UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, -72, 320, 72 * 2)];        imageView.image        = [UIImage imageNamed:@"1"];        [self addSubview:imageView];    }        return self;}@end

////  ViewController.m//  TableView////  Created by YouXianMing on 15/2/1.//  Copyright (c) 2015年 YouXianMing. All rights reserved.//#import "ViewController.h"#import "ImageCell.h"#define CELL_FLAG  @"Cell"#define IMAG_FLAG  @"Imag"typedef enum : NSUInteger {    SECTION_ONE = 0,    SECTION_TWO,        MAX_SECTION,} EViewController;@interface ViewController ()<UITableViewDataSource, UITableViewDelegate>@property (nonatomic, strong) UITableView *tableView;@property (nonatomic, strong) UIView      *blockView;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];     CGRect rect       = self.view.bounds;    rect.origin.y    += 72;    rect.size.height -= 72;        self.tableView            = [[UITableView alloc] initWithFrame:rect];    self.tableView.delegate   = self;    self.tableView.dataSource = self;    self.tableView.layer.masksToBounds = NO;    [self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:CELL_FLAG];    [self.tableView registerClass:[ImageCell class] forCellReuseIdentifier:IMAG_FLAG];    [self.view addSubview:self.tableView];        self.blockView                 = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 72)];    self.blockView.backgroundColor = [UIColor blackColor];    self.blockView.alpha           = 0.f;    [self.view addSubview:self.blockView];}#pragma mark scrollView位移- (void)scrollViewDidScroll:(UIScrollView *)scrollView {    CGFloat offsetY = scrollView.contentOffset.y;    CGFloat percent = offsetY / 72.f;    if (percent <= 0) {        percent = 0;    } else if (percent >= 1) {        percent = 1;    }        self.blockView.alpha = percent;}#pragma mark 每个区row的个数- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {    if (section == SECTION_ONE) {        return 1;    } else if (section == SECTION_TWO) {        return 7;    } else {        return 0;    }}#pragma mark 几个区- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {    return MAX_SECTION;}#pragma mark 重用cell- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {        if (indexPath.section == SECTION_ONE) {        ImageCell *cell = [tableView dequeueReusableCellWithIdentifier:IMAG_FLAG];        return cell;    } else if (indexPath.section == SECTION_TWO) {        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CELL_FLAG];        return cell;    } else {        return nil;    }}#pragma mark 返回headerView- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {    if (section == SECTION_ONE) {        return nil;    } else if (section == SECTION_TWO) {        UIView *view         = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 40)];        view.backgroundColor = [UIColor redColor];        return view;    } else {        return nil;    }}#pragma mark row高度- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {    if (indexPath.section == SECTION_ONE) {        return 72;    } else if (indexPath.section == SECTION_TWO) {        return 200;    } else {        return 0;    }}#pragma mark header高度- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {    if (section == SECTION_ONE) {        return 0.f;    } else if (section == SECTION_TWO) {        return 40;    } else {        return 0;    }}@end