在 UIWebView 上获取 HTTP 响应标头

问题描述

如何从 WebView 获取 HTTP 标头响应?我找到了半解决方案在 Stackoverflow，但它是用 Objective-C 编写的，无法将其转换为 Swift (我已经尝试过使用我糟糕的 Obj-C 知识).

How can I get HTTP headers response from WebView? I've found semi-solutions at Stackoverflow, but it's written on Objective-C and can't convert it to Swift (I've tried with my poor Obj-C knowledge).

Objective-C 代码:

Objective-C code:

- (void)webViewDidFinishLoad:(UIWebView *)webView {
    NSCachedURLResponse *resp = [[NSURLCache sharedURLCache] cachedResponseForRequest:webView.request];
    NSLog(@"%@",[(NSHTTPURLResponse*)resp.response allHeaderFields]);
}

1. 该代码将如何看待 Swift?
2. 也许现在我们有更好的方法来做到这一点?缓存并不总是启用.

推荐答案

Swift

Swift 更严格；你想保护自己免受 nil 指针和 optionals:

Swift is more stringent ; you want to protect yourself against nil pointers and optionals:

• 检查 webView 是否确实有 request
• 检查 request 是否确实有 NSCachedURLResponse
• 根据 NSHTTPURLResponse
对响应进行类型检查

• check that the webView actually has a request
• check that the request actually has a NSCachedURLResponse
• type-check the response against NSHTTPURLResponse

func webViewDidFinishLoad(webView: UIWebView) {
    if let request = webView.request {
        if let resp = NSURLCache.sharedURLCache().cachedResponseForRequest(request) {
            if let response = resp.response as? NSHTTPURLResponse {
                print(response.allHeaderFields)
            }
        }
    }
}

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