tableView 拉伸图片

#define sclae 2.5
#define HeadViewHeight (SCREEN_WIDTH/sclae)

@interface PersonalCenterViewController

@property (nonatomic,strong) UIImageView* headView;

@property (strong, nonatomic) UITableView *tableView;
@property (nonatomic,assign) CGRect oldFrame;

@end

- (void)creatHeadView{

    self.headView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, HeadViewHeight)];
    self.headView.backgroundColor = [UIColor clearColor];
    self.oldFrame = self.headView.frame;
//    _headView.contentMode = UIViewContentModeScaleAspectFit;

    [self.view addSubview:_headView];
     _headView.image = [UIImage imageNamed:@"背景"];

    [self.view bringSubviewToFront:self.tableView];
    self.tableView.backgroundColor = [UIColor clearColor];

UIView *tabHead = [[UIView alloc] initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, HeadViewHeight)];
self.tableView.tableHeaderView = tabHead;

}

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#pragma mark delegate

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

    //self.navgationBar.backgroundImage = [UIImage imageNamed:@""];
    CGFloat yOffset = scrollView.contentOffset.y;
    NSLog(@"%f",yOffset);

    if (scrollView == self.tableView) {
        if (yOffset<HeadViewHeight) {
            CGFloat alpha = yOffset/HeadViewHeight;
            //self.navgationBar.backgroundColor = [[UIColor whiteColor]colorWithAlphaComponent:alpha];
        }else{

           // self.navgationBar.backgroundColor = [UIColor whiteColor];
        }

    }

    if (yOffset>=0) {

        CGRect frame = self.oldFrame;
        frame.origin.y = frame.origin.y - yOffset;
        self.headView.frame = frame;

    }else{

        CGRect frame = self.oldFrame;
        frame.size.height = frame.size.height - yOffset;
        frame.size.width = frame.size.height * sclae;
        frame.origin.x = self.oldFrame.origin.x - (frame.size.width -self.oldFrame.size.width)/2;
        self.headView.frame = frame;
    }
}

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