抽茧剥丝系列-Kingfisher

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  • 因为涉及到UI的改变，所以要在主线程调用该function
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public func setImage(
        with source: Source?,
        placeholder: Placeholder? = nil,
        options: KingfisherOptionsInfo? = nil,
        progressBlock: DownloadProgressBlock? = nil,
        completionHandler: ((Result<RetrieveImageResult, KingfisherError>) -> Void)? = nil) -> DownloadTask?
    {
    }
  • Resource是一个protocol，URL遵守该protocol，并将absoluteString当做CacheKey，如需自定义cacheKey、downloadURL，使用ImageResource替代Resource
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    extension URL: Resource {
        public var cacheKey: String { return absoluteString }
        public var downloadURL: URL { return self }
    }