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        <div class="chatlog__header"><span class="chatlog__author" style="color:rgb(155,89,182)" title="norio_nomura" data-user-id="127674083331538944">norio_nomura</span> <a href="/channels/346503087256502274?category=開発以外&amp;channel=zatsu&amp;message_id=356640291857629185"><span class="chatlog__timestamp" title="Monday, September 11, 2017 3:20 AM"></span></a><a href="#chatlog__message-container-356640099804512268">9/11/2017 3:20 AM</a></div>
        <div class="chatlog__content chatlog__markdown"><span class="chatlog__markdown-preserve"><a href="https://developer.apple.com/videos/play/wwdc2017/406/?time=160">https://developer.apple.com/videos/play/wwdc2017/406/?time=160</a>
            <code class="chatlog__markdown-pre chatlog__markdown-pre--multiline nohighlight">The main thread checker is a completely new tool in Xcode 9 and it detects violations of some commonly used APIs. And specifically it focuses on UI updates and multithreading. Some APIs require that you only use them from the main thread.</code></span> <span class="chatlog__edited-timestamp" title="Monday, September 11, 2017 3:20 AM">(edited)</span></div>
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                <div class="chatlog__embed-title"><a class="chatlog__embed-title-link" href="https://developer.apple.com/videos/play/wwdc2017/406/?time=160">
                    <div class="chatlog__markdown chatlog__markdown-preserve">Finding Bugs Using Xcode Runtime Tools - WWDC 2017 - Videos - Apple Developer</div>
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                  <div class="chatlog__markdown chatlog__markdown-preserve">Learn how to use Xcode 9 runtime tools to help find issues and bugs, ranging from missing and unintended UI updates to integer overflows...</div>
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        <div class="chatlog__short-timestamp" title="Monday, September 11, 2017 3:21 AM">3:21 AM</div>
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        <div class="chatlog__content chatlog__markdown"><span class="chatlog__markdown-preserve">Some APIs</span></div>
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