iOS加载拉伸的图片

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+ (UIImage*)stretchImage:(NSString *)imageName {
    
    UIImage *image = [UIImage imageNamed:imageName];
    if ([image respondsToSelector:@selector(resizableImageWithCapInsets:)]) {
        CGSize imageSize = image.size;
        image = [image resizableImageWithCapInsets:UIEdgeInsetsMake(imageSize.height/2,
                                                                    imageSize.width/2,
                                                                    imageSize.height/2,
                                                                    imageSize.width/2)];
    }
    else{
        image = [image stretchableImageWithLeftCapWidth:1 topCapHeight:1];
    }
    
    return image;
}