- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view.

    //使图片两边不拉伸，中间拉伸

    UIImage *image = [UIImage imageNamed:@"1.jpg"];

    image = [image stretchableImageWithLeftCapWidth:floorf(image.size.width/2) topCapHeight:floorf(image.size.height/2)];

    UIImageView *imageView=[[UIImageView alloc]initWithFrame:CGRectMake(50, 100, 200, 200)];

    imageView.backgroundColor=[UIColor redColor];

    imageView.image=image;

    [self.view addSubview:imageView];

}