简单的图片拉伸

    UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(10, 10, self.view.frame.size.width - 20, self.view.frame.size.height - 20)];
    UIImage *image = [UIImage imageNamed:@"adfn"];
    UIEdgeInsets edgeInsets = UIEdgeInsetsMake(10, 10, 10, 10);
    image = [image resizableImageWithCapInsets:edgeInsets resizingMode:UIImageResizingModeStretch];
    imageView.image = image;
    [self.view addSubview:imageView];


//UIImageResizingModeTile, 平铺模式
//UIImageResizingModeStretch,拉伸模式