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#import "TableViewController.h"

@interface TableViewController ()
{
    UIView *_headerView;
    UIImageView *imagee;
}
@end

@implementation TableViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    _headerView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, [[UIScreen mainScreen] bounds].size.width, 200)];
    UIImage *image = [UIImage imageNamed:@"1"];
   imagee = [[UIImageView alloc]initWithFrame:CGRectMake(([[UIScreen mainScreen] bounds].size.width / 2) - 40 , 25, 80, 80)];
    imagee.image = image;
    [_headerView addSubview:imagee];
    self.tableView.tableHeaderView = _headerView;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
    CGFloat yOffset = self.tableView.contentOffset.y;
    //向上偏移量变正  向下偏移量变负
    if (yOffset < -64) {
        CGFloat factor = ABS(yOffset)+200-64;
        CGRect f = CGRectMake(-([[UIScreen mainScreen] bounds].size.width*factor/200-[[UIScreen mainScreen] bounds].size.width)/2,-ABS(yOffset)+64, [[UIScreen mainScreen] bounds].size.width*factor/200, factor);
        imagee.frame = f;
    }else {
        CGRect f = _headerView.frame;
        f.origin.y = 0;
        _headerView.frame = f;
        imagee.frame = CGRectMake(0, f.origin.y, [[UIScreen mainScreen] bounds].size.width, 200);
    }
}
#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
#warning Potentially incomplete method implementation.
    // Return the number of sections.
    return 0;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
#warning Incomplete method implementation.
    // Return the number of rows in the section.
    return 0;
}