iPhone - 我如何知道 URL 是否是资源文件？

Question

我在 shouldStartLoadWithRequest 中捕获了一个 url。

我如何知道它是否是我正在尝试打开的项目资源之一(例如使用 [self.webView loadHTMLString:htmlContentFinal baseURL:[NSURL fileURLWithPath:bundlePath]];)，或者其他什么？

Answer 1

您可以检查 URL 字符串是否以 file:// 开头:

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    if (request.URL.isFileURL) {
        // do some stuff
    }
}

---

How may I ensure that I am the one who loaded that file? The user could wrote that url in the url field himself.

您可以实现 -textFieldDidBeginEditing 或 -textFieldDidEndEditing 并将一些 bool 属性设置为 YES:

- (void)textFieldDidEndEditing:(UITextField *)textField {
    if ([[textField.text substringToIndex:7] isEqualToString:@"file://"]) {
        self.fileUrlEnteredManually = YES;
    } else {
        self.fileUrlEnteredManually = NO;
    }
}

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    if (request.URL.isFileURL) {
        if (self.fileUrlEnteredManually) {
            // user entered "file://" manually
        } else {
            // user didn't
        }
    }
}

- (void)viewDidload {

    // ...

    fileUrlEnteredManually = NO;
    [webView loadRequest:yourLocalRequest];

}