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我对 swift 和 iOS 开发完全陌生。我正在尝试做一个 webview 应用程序，我需要更新缓存，因为网站可以更改，但我还需要能够在离线时访问它。有没有我可以使用的预制缓存策略来实现这一点？
根据 Apple 开发支持成员的说法，NSURLCache was designed as a general purpose cache and doesn’t have the infrastructure needed to reliably support an offline mode. 这意味着如果你想创建一个离线模式，你必须自己实现缓存。
NSURLCache was designed as a general purpose cache and doesn’t have the infrastructure needed to reliably support an offline mode
来源：NSURLRequest.CachePolicy 线程