blocks|key|1317324|text|您可以使用下面的代码获取param|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1317325|func+getQueryStringParameter(url:+String,+param:+String)+->+String?+{
++guard+let+url+=+URLComponents(string:+url)+else+{+return+nil+}
++return+url.queryItems?.first(where:+{+$0.name+==+param+})?.value
}|code-block|syntax|javascript|1317326|调用类似于let+test1+=+getQueryStringParameter(url,+param:+"test1")的方法|offset|length|style|CODE|1317327|具有扩展的其他方法：|BOLD|1317328|extension+URL+{
++++public+var+queryParameters:+[String:+String]?+{
++++++++guard
++++++++++++let+components+=+URLComponents(url:+self,+resolvingAgainstBaseURL:+true),
++++++++++++let+queryItems+=+components.queryItems+else+{+return+nil+}
++++++++return+queryItems.reduce(into:+[String:+String]())+{+(result,+item)+in
++++++++++++result[item.name]+=+item.value
++++++++}
++++}
}|1317329|entityMap^0|0|0|5|1K|0|5|5|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|U|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|V|8|@$I|W|J|X|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|Y|8|@$I|Z|J|10|K|O]]|9|@]|A|$]]|$1|P|3|Q|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|R|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|S|$]]

You can use the below code to get the param
<pre><code>func getQueryStringParameter(url: String, param: String) -&gt; String? {
 guard let url = URLComponents(string: url) else { return nil }
 return url.queryItems?.first(where: { $0.name == param })?.value
}
</code></pre>
Call the method like <code>let test1 = getQueryStringParameter(url, param: &quot;test1&quot;)</code>
Other method with extension:
<pre><code>extension URL {
 public var queryParameters: [String: String]? {
 guard
 let components = URLComponents(url: self, resolvingAgainstBaseURL: true),
 let queryItems = components.queryItems else { return nil }
 return queryItems.reduce(into: [String: String]()) { (result, item) in
 result[item.name] = item.value
 }
 }
}
</code></pre>

blocks|key|108445|text|步骤1:创建URL扩展|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|108446|extension+URL+{
++++func+valueOf(_+queryParameterName:+String)+->+String?+{
++++++++guard+let+url+=+URLComponents(string:+self.absoluteString)+else+{+return+nil+}
++++++++return+url.queryItems?.first(where:+{+$0.name+==+queryParameterName+})?.value
++++}
}|code-block|syntax|javascript|108447|步骤2:如何使用扩展|108448|let+newURL+=+URL(string:+"http://mysite3994.com?test1=blah&test2=blahblah")!

newURL.valueOf("test1")+//+Output+i.e+"blah"
newURL.valueOf("test2")+//+Output+i.e+"blahblah"|108449|entityMap^0|0|4|0|0|0|4|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

Step 1: Create URL extension
<pre><code>extension URL {
 func valueOf(_ queryParameterName: String) -&gt; String? {
 guard let url = URLComponents(string: self.absoluteString) else { return nil }
 return url.queryItems?.first(where: { $0.name == queryParameterName })?.value
 }
}
</code></pre>
Step 2: How to use the extension
<pre><code>let newURL = URL(string: &quot;http://mysite3994.com?test1=blah&amp;test2=blahblah&quot;)!

newURL.valueOf(&quot;test1&quot;) // Output i.e &quot;blah&quot;
newURL.valueOf(&quot;test2&quot;) // Output i.e &quot;blahblah&quot;
</code></pre>

blocks|key|108276|text|我还做了一个URL扩展，但是将查询param查找放入下标。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|108277|extension+URL+{
++++subscript(queryParam:String)+->+String?+{
++++++++guard+let+url+=+URLComponents(string:+self.absoluteString)+else+{+return+nil+}
++++++++return+url.queryItems?.first(where:+{+$0.name+==+queryParam+})?.value
++++}
}|code-block|syntax|javascript|108278|用法：|108279|let+url+=+URL(string:+"http://some-website.com/documents/127/?referrer=147&mode=open")!

let+referrer+=+url["referrer"]++//+"147"
let+mode+++++=+url["mode"]++++++//+"open"|108280|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I also made a URL extension, but put the query param lookup into a subscript.

<pre><code>extension URL {
 subscript(queryParam:String) -&gt; String? {
 guard let url = URLComponents(string: self.absoluteString) else { return nil }
 return url.queryItems?.first(where: { $0.name == queryParam })?.value
 }
}
</code></pre>

Usage:

<pre><code>let url = URL(string: "http://some-website.com/documents/127/?referrer=147&amp;mode=open")!

let referrer = url["referrer"] // "147"
let mode = url["mode"] // "open"
</code></pre>

blocks|key|1317367|text|看来，当链接指向在角上创建的网站时，现有的答案都不起作用。这是因为角的路径通常在所有链接中都包含一个#+(散列)符号，这导致url.queryItems总是返回零。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1317368|如果链接如下所示：http://example.com/path/#/morepath/aaa?test1=blah&test2=blahblah|1317369|然后，参数只能从url.fragment中得到。在@Matt的扩展中添加了一些额外的解析逻辑，更通用的代码如下所示：|1317370|extension+URL+{
++++subscript(queryParam:+String)+->+String?+{
++++++++guard+let+url+=+URLComponents(string:+self.absoluteString)+else+{+return+nil+}
++++++++if+let+parameters+=+url.queryItems+{
++++++++++++return+parameters.first(where:+{+$0.name+==+queryParam+})?.value
++++++++}+else+if+let+paramPairs+=+url.fragment?.components(separatedBy:+"?").last?.components(separatedBy:+"&")+{
++++++++++++for+pair+in+paramPairs+where+pair.contains(queryParam)+{
++++++++++++++++return+pair.components(separatedBy:+"=").last
++++++++++++}
++++++++++++return+nil
++++++++}+else+{
++++++++++++return+nil
++++++++}
++++}
}|code-block|syntax|javascript|1317371|用法保持不变：|1317372|let+url+=+URL(string:+"http://example.com/path/#/morepath/aaa?test1=blah&test2=blahblah")!

let+referrer+=+url["test1"]++//+"blah"
let+mode+++++=+url["test2"]++//+"blahblah"|1317373|entityMap^0|1E|1|1Q|E|0|9|1S|0|8|C|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|12|8|@$9|13|A|14|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|15|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|16|8|@]|D|@]|E|$]]|$1|Q|3|R|5|L|7|17|8|@]|D|@]|E|$M|N]]|$1|S|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|T|$]]

It appears that none of existing answers work when the link leads to a web site created on Angular. This is because Angular's paths often include a <code>#</code> (hash) symbol in all links, which results in <code>url.queryItems</code> always returning nil.

If a link looks like this: <code>http://example.com/path/#/morepath/aaa?test1=blah&amp;test2=blahblah</code>

Then the parameters can only be obtained from <code>url.fragment</code>. With some additional parsing logic added to @Matt's extension, a more universal code would look like this:

<pre><code>extension URL {
 subscript(queryParam: String) -&gt; String? {
 guard let url = URLComponents(string: self.absoluteString) else { return nil }
 if let parameters = url.queryItems {
 return parameters.first(where: { $0.name == queryParam })?.value
 } else if let paramPairs = url.fragment?.components(separatedBy: "?").last?.components(separatedBy: "&amp;") {
 for pair in paramPairs where pair.contains(queryParam) {
 return pair.components(separatedBy: "=").last
 }
 return nil
 } else {
 return nil
 }
 }
}
</code></pre>

Usage remains same:

<pre><code>let url = URL(string: "http://example.com/path/#/morepath/aaa?test1=blah&amp;test2=blahblah")!

let referrer = url["test1"] // "blah"
let mode = url["test2"] // "blahblah"
</code></pre>

blocks|key|108493|text|另一种方法是在URL上创建一个扩展来返回组件，然后在URLQueryItem上创建一个扩展来从queryItems中检索值。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|108494|extension+URL+{
++++var+components:+URLComponents?+{
++++++++return+URLComponents(url:+self,+resolvingAgainstBaseURL:+false)
++++}
}

extension+Array+where+Iterator.Element+==+URLQueryItem+{
++++subscript(_+key:+String)+->+String?+{
++++++++return+first(where:+{+$0.name+==+key+})?.value
++++}
}|code-block|syntax|javascript|108495|这是一个如何使用它的例子：|108496|if+let+urlComponents+=+URL(string:+"http://mysite3994.com?test1=blah&test2=blahblah")?.components,
++++let+test1Value+=+urlComponents.queryItems?["test1"]+{
++++print(test1Value)
}|108497|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Another way of doing this is to create an extension on URL to return the components, and then create an extension on [URLQueryItem] to retrieve the value from the queryItems.

<pre><code>extension URL {
 var components: URLComponents? {
 return URLComponents(url: self, resolvingAgainstBaseURL: false)
 }
}

extension Array where Iterator.Element == URLQueryItem {
 subscript(_ key: String) -&gt; String? {
 return first(where: { $0.name == key })?.value
 }
}
</code></pre>

And this is an example of how this could be used:

<pre><code>if let urlComponents = URL(string: "http://mysite3994.com?test1=blah&amp;test2=blahblah")?.components,
 let test1Value = urlComponents.queryItems?["test1"] {
 print(test1Value)
}
</code></pre>

I am trying to get the parameters from a URL using Swift. Let's say I have the following URL:

<pre><code>http://mysite3994.com?test1=blah&amp;test2=blahblah
</code></pre>

How can I get the values of test1 and test2?

Get the value of URL Parameters

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

我正在尝试使用Swift从URL中获取参数。假设我有以下URL：http://mysite3994.com?test1=blah&test2=blahblah如何获得test1和test2的值？

问获取URL参数的值
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问获取URL参数的值EN