用tableView实现的一种加载数据的布局

//
//  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