UITableView 下拉放大

//

//  TableViewController.m

//  atest

//

//  Copyright (c) 2015年 Person. All rights reserved.

//

#import "TableViewController.h"

#define ImageHight 200.0f

@interface TableViewController ()<UIScrollViewDelegate>

@property UIImageView*contentImage;

@property UIView*headerView;

@end

@implementation TableViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    _headerView = [[UIView alloc] initWithFrame:CGRectMake(0, -ImageHight, 320, ImageHight)];

    _headerView.backgroundColor = [UIColor orangeColor];

    self.tableView.contentInset = UIEdgeInsetsMake(ImageHight, 0, 0, 0);

    _contentImage = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"a.png"]];

    _contentImage.frame = CGRectMake(0, 0, self.view.frame.size.width, ImageHight);

    _contentImage.contentMode = UIViewContentModeScaleToFill;

    UILabel*label = [[UILabel alloc] initWithFrame:CGRectMake(10, -60, 100, 40)];

    label.backgroundColor = [UIColor redColor];

    [self.tableView addSubview:_headerView];

    [_headerView addSubview:_contentImage];

    self.tableView.rowHeight = 44.0f;

}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{

    

    CGFloat y = scrollView.contentOffset.y;

    if (y < -ImageHight) {

        CGRect frame = _headerView.frame;

        frame.origin.y = y;

        frame.size.height =-y;

        CGFloat newWidth = -y/ImageHight*self.view.frame.size.width;

        frame.origin.x=(self.view.frame.size.width-newWidth)/2;

        frame.size.width =newWidth;

        _headerView.frame = frame;

        _contentImage.frame = _headerView.bounds;

    }

}

@end