iOSテーブルビューは、プルダウン画像の拡大効果を実現します。

#import "ViewController.h"
#define kScreenbounds [UIScreen mainScreen].bounds
#define kScreenWidth [UIScreen mainScreen].bounds.size.width
#define kScreenHeight [UIScreen mainScreen].bounds.size.height
//        
#define pictureHeight 200
@interface ViewController ()<UITableViewDataSource, UITableViewDelegate>
@property (nonatomic, strong) UITableView *tableView;
@property (nonatomic, strong) UIImageView *pictureImageView;
@property (nonatomic, strong) UIView *header;
@end

@implementation ViewController

- (void)viewDidLoad {
  [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.
  
  self.navigationItem.title = @"        ";
  //            translucent NO,         
  self.edgesForExtendedLayout = UIRectEdgeNone;
  self.automaticallyAdjustsScrollViewInsets = NO;
  [self createTableView];
  
}
- (void)createTableView
{
  self.tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, kScreenWidth, kScreenHeight - 64) style:UITableViewStylePlain];
  _tableView.delegate = self;
  _tableView.dataSource = self;
  [_tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cell"];
  
  //              ImageView
  self.header = [[UIView alloc] initWithFrame:CGRectMake(0, 0, kScreenWidth, pictureHeight)];
  _pictureImageView = [[UIImageView alloc] initWithFrame:_header.bounds];
  _pictureImageView.image = [UIImage imageNamed:@"picture"];
  /* 
          
   */
  //                                  UIViewContentModeScaleAspectFill                                 UIView
  _pictureImageView.contentMode = UIViewContentModeScaleAspectFill;
  //                    YES ，               .       _pictureImageView  _header     .
  _pictureImageView.clipsToBounds = YES;
  [_header addSubview:_pictureImageView];
  self.tableView.tableHeaderView = _header;
  [self.view addSubview:_tableView];
  
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{

  return 20;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

  UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
  cell.textLabel.text = @"    ";
  return cell;
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
  
  /**
   *           contentInset           0            
   */
  
  //    tableView   
  CGFloat Offset_y = scrollView.contentOffset.y;
  //                
    if ( Offset_y < 0) {
      //         
      CGFloat totalOffset = pictureHeight - Offset_y;
      //       
      CGFloat scale = totalOffset / pictureHeight;
      CGFloat width = kScreenWidth;
      //        
      _pictureImageView.frame = CGRectMake(-(width * scale - width) / 2, Offset_y, width * scale, totalOffset);
    }

}

- (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.
}

@end