[NSURL URLWithString:stringContainingSpecialCharacters]

发布于 2024-10-14 02:22:45 字数 1947 浏览 3 评论 0原文

假设我有一个地址栏，它是一个名为 textField 的 UITextField 和一个名为 webView 的 UIWebView。大多数情况下，以下代码有效：

[webView loadURL:[NSURL URLWithString:textField.text]];

当我输入一些带有特殊字符的长字符串时，URLWithString: 仅返回null。可读性书签就是一个很好的例子：

javascript:(function(){readConvertLinksToFootnotes=true;readStyle='style-newspaper';readSize='size-medium';readMargin='margin-wide';_readability_script=document.createElement('script');_readability_script.type='text/javascript';_readability_script.src='http://lab.arc90.com/experiments/readability/js/readability.js?x='+(Math.random());document.documentElement.appendChild(_readability_script);_readability_css=document.createElement('link');_readability_css.rel='stylesheet';_readability_css.href='http://lab.arc90.com/experiments/readability/css/readability.css';_readability_css.type='text/css';_readability_css.media='all';document.documentElement.appendChild(_readability_css);_readability_print_css=document.createElement('link');_readability_print_css.rel='stylesheet';_readability_print_css.href='http://lab.arc90.com/experiments/readability/css/readability-print.css';_readability_print_css.media='print';_readability_print_css.type='text/css';document.getElementsByTagName('head')[0].appendChild(_readability_print_css);})();

根据这个答案，我可以使用stringByAddingPercentEscapesUsingEncoding来转义字符串，实际上它对于这种情况工作得很好。

我的问题是：在将字符串传递给 webView 之前始终调用 stringByAddingPercentEscapesUsingEncoding: 是否安全？以下情况有什么后果吗？

[webView loadURL:[NSURL URLWithString:[textField.text stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]]

谢谢！

编辑：我所说的“安全”是指，虽然这适用于包含 Unicode 字符的 URL，但它仍然适用于“正常”URL 吗？

编辑2：如果这是“安全”的，为什么它不是默认行为？

原文

Say, I have an address bar which is a UITextField called textField, and a UIWebView named webView. Most of the time the follow code works:

[webView loadURL:[NSURL URLWithString:textField.text]];

When I put in some long string with special characters, URLWithString: simply returns null. The Readability bookmarklet is a good example:

javascript:(function(){readConvertLinksToFootnotes=true;readStyle='style-newspaper';readSize='size-medium';readMargin='margin-wide';_readability_script=document.createElement('script');_readability_script.type='text/javascript';_readability_script.src='http://lab.arc90.com/experiments/readability/js/readability.js?x='+(Math.random());document.documentElement.appendChild(_readability_script);_readability_css=document.createElement('link');_readability_css.rel='stylesheet';_readability_css.href='http://lab.arc90.com/experiments/readability/css/readability.css';_readability_css.type='text/css';_readability_css.media='all';document.documentElement.appendChild(_readability_css);_readability_print_css=document.createElement('link');_readability_print_css.rel='stylesheet';_readability_print_css.href='http://lab.arc90.com/experiments/readability/css/readability-print.css';_readability_print_css.media='print';_readability_print_css.type='text/css';document.getElementsByTagName('head')[0].appendChild(_readability_print_css);})();

According to this answer, I can use stringByAddingPercentEscapesUsingEncoding to escape the string, and indeed it works fine for this case.

My question is: Is this safe to always call stringByAddingPercentEscapesUsingEncoding: before passing the string to the webView? Does the following have any consequences?

[webView loadURL:[NSURL URLWithString:[textField.text stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]]

Thanks!

EDIT: What I mean by 'safe' is that while this works with URLs containing Unicode characters, does it still work fine with 'normal' URLs?

EDIT 2: If this is 'safe', why isn't it the default behaviour?

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妥活 2024-10-21 02:22:45

由于我的问题没有其他答案，我决定使用以下 - (NSURL *)URLValue 方法而不是 - (NSURL *)URLWithString: 作为安全措施：

- (NSURL *)URLValue {
    NSURL *URL = [NSURL URLWithString:self];

    if (URL) return URL;

    return [NSURL URLWithString:[self stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
}

Since there's no other answers to my question, I decided to use the following - (NSURL *)URLValue method instead of - (NSURL *)URLWithString: as a safe measure:

- (NSURL *)URLValue {
    NSURL *URL = [NSURL URLWithString:self];

    if (URL) return URL;

    return [NSURL URLWithString:[self stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
}

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