Question

SDWebImage是将URL转换为图像的绝佳库。它工作得很好。但是，我有以下问题

//对于imageview，我们设置为

eventImageView.sd_setImage(with: URL(string: imageUrl), placeholderImage: UIImage(named: "placeholder.png"))

    // but, for Image as UIColor,

Showing compiler error if I use like following

self.scrollView.backgroundColor = UIColor(patternImage: sd_setImage(with: URL(string: imageUrl), placeholderImage:UIImage(named: "placeholder.png")))

即使我尝试过跟随

    let imageBG = sd_setImage(with: URL(string: image), placeholderImage: UIImage(named: "placeholder.png"))

    self.scrollView.backgroundColor = UIColor(patternImage: imageBG)

并显示以下错误

使用未解析的标识符＆＃39; sd_setImage＆＃39;

有人可以建议我如何解决这个问题吗？

Answer 1

您需要先使用SDWebImageManager下载图片，然后在UIColor(patterImage:)构造函数中使用它。请尝试以下代码：

 SDWebImageManager.shared().loadImage(with: URL(string: imageUrl), options: [], progress: nil, completed: { (image, data, error, cacheType, success, url) in
                    DispatchQueue.main.async {
                        guard let image = image else {                            
                            return
                        }
                        self.scrollView.backgroundColor = UIColor(patternImage: image)
                    }
                })

Answer 2

发生这种情况是因为0b101010 UIImageView 方法（sd_setImage应该是eventImageView），http://php.net/manual/language.types.integer.php声明是：

UIImageView

表示init(patternImage image: UIImage)参数为patternImage 而非 UIImage。

要解决此问题，首先应加载图像视图，加载完成后，您可以将颜色指定为图像视图的UIImageView：

image

或（没有占位符）：

eventImageView.sd_setImage(with: URL(string: imageUrl), placeholderImage: UIImage(named: "placeholder.png")) { (image, error, cache, url) in
      self.scrollView.backgroundColor = UIColor(patternImage: image)
}

Answer 3

sd_setImage(with适用于UIImageView

创建结构为 -

  struct ImageSetter {
        static func setImage(scrollView: UIScrollView,myImageView: UIImageView,imageUrl: URL,placeHolderImage: UIImage){
            myImageView.sd_setImage(with: imageUrl, placeholderImage: placeHolderImage, options: [], completed: { (imageBackground, error, cache, url) in
                scrollView.backgroundColor = UIColor.init(patternImage: imageBackground ?? UIImage(named: "place-holder-image")!)
            })
        }
    }

使用 -

ImageSetter.setImage(scrollView: scrollView, myImageView: testImageView, imageUrl: url, placeHolderImage: image)

SDWebImage

如何在Swift中显示背景颜色的SDWebimage

3 个答案: