UIImage *image = [UIImage imageNamed:@"ncf_rectangle"];
/// 图片重绘
UIGraphicsBeginImageContextWithOptions(sectionFrame.size, NO, 0.f);
/// 设置重绘不变形区域
image = [image resizableImageWithCapInsets:UIEdgeInsetsMake(35, 35, 35, 35) resizingMode:UIImageResizingModeStretch];
[image drawInRect:CGRectMake(0, 0, sectionFrame.size.width, sectionFrame.size.height)];
UIImage *lastImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();