改变Alamofire函数调用的属性值_swift 在alamofire函数调用中更改属性值-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_43866238/article/details/85069598

本文探讨了使用Alamofire发送GET请求时遇到的变量修改问题。作者尝试在一个测试类中通过调用Alamofire的request方法并传入自定义URL执行GET请求，在回调函数中修改实例变量i的值，期望输出为22，但实际结果为12。文章详细描述了代码实现过程及预期与实际结果的对比，引发读者对异步请求中变量作用域及修改时机的思考。

最近我开始Alamofire。我想用Alamofire发送一个简单的GET请求:

<span style="color:#393318"><code><span style="color:#101094">import</span> <span style="color:#2b91af">Alamofire</span>

<span style="color:#101094">class</span> <span style="color:#2b91af">Test</span><span style="color:#303336">{</span>
    <span style="color:#101094">var</span><span style="color:#303336"> url</span><span style="color:#303336">:</span><span style="color:#2b91af">String</span> <span style="color:#303336">=</span> <span style="color:#7d2727">"www.github.com"</span>
    <span style="color:#101094">var</span><span style="color:#303336"> i</span><span style="color:#303336">:</span> <span style="color:#2b91af">Int</span> <span style="color:#303336">=</span> <span style="color:#7d2727">1</span>

    <span style="color:#101094">func</span><span style="color:#303336"> change</span><span style="color:#303336">(){</span>
        <span style="color:#2b91af">Alamofire</span><span style="color:#303336">.</span><span style="color:#303336">request</span><span style="color:#303336">(</span><span style="color:#303336">url</span><span style="color:#303336">,</span><span style="color:#303336"> method</span><span style="color:#303336">:.</span><span style="color:#101094">get</span><span style="color:#303336">).</span><span style="color:#303336">responseString </span><span style="color:#303336">{</span><span style="color:#303336"> response </span><span style="color:#101094">in</span>
            <span style="color:#101094">self</span><span style="color:#303336">.</span><span style="color:#303336">i </span><span style="color:#303336">+=</span> <span style="color:#7d2727">1</span><span style="color:#303336">
            print</span><span style="color:#303336">(</span><span style="color:#101094">self</span><span style="color:#303336">.</span><span style="color:#303336">i</span><span style="color:#303336">)</span>
        <span style="color:#303336">}</span><span style="color:#303336">
        print</span><span style="color:#303336">(</span><span style="color:#303336">i</span><span style="color:#303336">)</span>
    <span style="color:#303336">}</span>
<span style="color:#303336">}</span></code></span>

我想改变属性iAlamofire类测试从1到2的函数调用。控制台和打印结果,看看会发生什么。我期望的输出