resizableImageWithCapInsets: resizingMode:拉伸图片

- (UIImage *)resizableImageWithCapInsets:(UIEdgeInsets)capInsets resizingMode:(UIImageResizingMode)resizingMode NS_AVAILABLE_IOS(6_0); // the interior is resized according to the resizingMode

+ (UIImage *)resizableImageWithName:(NSString *)imageName

{

    

    // 加载原有图片

    UIImage *norImage = [UIImage imageNamed:imageName];

    // 获取原有图片的宽高的一半

    CGFloat w = norImage.size.width * 0.5;

    CGFloat h = norImage.size.height * 0.5;

    // 生成能够拉伸指定位置的图片

    UIImage *newImage = [norImage resizableImageWithCapInsets:UIEdgeInsetsMake(h, w, h, w) resizingMode:UIImageResizingModeStretch];

    

    return newImage;

}