#import "TableViewController.h"

@interface TableViewController ()
@property (nonatomic, retain) UIImageView *headerImageView;
@end

@implementation TableViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self layoutHeaderImageView];
}

- (void)layoutHeaderImageView {
    UIView *headerView = [[UIView alloc] initWithFrame:(CGRectMake(0, 0, self.view.frame.size.width, 200))];
    self.headerImageView = [[UIImageView alloc] initWithFrame:(CGRectMake(0, 0, self.view.frame.size.width, 200))];
    self.headerImageView.image  = [UIImage imageNamed:@"pic5093_sc115.com.jpg"]; // 自己選擇的圖片
    [headerView addSubview:self.headerImageView];
    self.tableView.tableHeaderView = headerView;
    
}

// 下拉后圖片拉伸的效果方法下載這個(gè)里面
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    CGFloat width = self.view.frame.size.width; // 圖片寬度
    CGFloat yOffset = scrollView.contentOffset.y;  // 偏移的y值
    if (yOffset < 0) {
        CGFloat totalOffset = 200 + ABS(yOffset);
        CGFloat f = totalOffset / 200;
        self.headerImageView.frame =  CGRectMake(- (width * f - width) / 2, yOffset, width * f, totalOffset); //拉伸后的圖片的frame應(yīng)該是同比例縮放。
    }
}

這個(gè)方法是有效的，我自己在剛才又重新寫(xiě)了一遍