Kingfisher：“setBackgroundImage(with:for:placeholder:options:progressBlock:completionHandler:)”的使用不明确

Question

我一直在尝试使用 Kingfisher 设置按钮的背景图像，但我收到了一个快速编译器错误：

'setBackgroundImage(with:for:placeholder:options:progressBlock:completionHandler:)' 的使用不明确

这个表达有歧义怎么办？我查看了 KF 文档，我认为这就是您的称呼。

var options: KingfisherOptionsInfo = []
options.append(.forceRefresh)
button.kf.setBackgroundImage(with: URL(string: picture), for: .normal, placeholder: nil, options: options, progressBlock: nil, completionHandler: nil)

Answer 1

该错误是因为您需要处理completionHandler而不是传递nil。尝试下面的代码：

button.kf.setBackgroundImage(with: URL(string: picture), for: .normal, placeholder: nil, options: options, progressBlock: nil) { result in
    // result is either a .success(RetrieveImageResult) or a .failure(KingfisherError)
    switch result {
    case .success(let value):
        // The image was set to image view:
        print(value.image)

        // From where the image was retrieved:
        // - .none - Just downloaded.
        // - .memory - Got from memory cache.
        // - .disk - Got from disk cache.
        print(value.cacheType)

        // The source object which contains information like `url`.
        print(value.source)

    case .failure(let error):
        print(error) // The error happens
    }
}