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<!doctype html>
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Code snippets, save time
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Posted on
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<p>WWDC上Apple的工程师经常在demo的时候拖自己的code snippet，为什么不用completion shortcut，是提醒懒人们多用这功能吗？</p>
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Communications between sandbox apps in Mac
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<p>由于 Mac 对 Sandbox 的种种限制，使得 Sandb app 间的通信方式与普通 non Sandbox app 间的通信方式有所不同，普通的通信方式，如 <em><code>NSDistributedNotification</code></em>、<em><code>Distributed Objects</code></em>、 <em><code>XPC</code></em> 等不能直接套用到 Sandbox 机制上。</p>
<p>Mac 引入了 <em><code>Sandbox App Group</code></em> 的机制，使得同属于一个 app group 的不同 app 间有了合适的通信方式。</p>
<h3 id="Sandbox_App_Group_是什么">Sandbox App Group 是什么</h3><p>Sandbox App Group 表示由同一个 Developer ID 签名的 app group。每个 Developer ID 可以签名多个 Sandbox App Group，每个 Sandbox App Group 可以包含若干个 Sandbox app。</p>
<p>如果想要声明一个 Sandbox app 属于某个 Sandbox App Group，需要在该 app 的 <em><code>.entitlements</code></em> 中添加一个 <em><code>com.apple.security.application-groups</code></em> array，它的每个元素表示该 app 属于的某个 Sandbox app group，用 Group Bundle ID 表示。</p>
<p><strong><code>Group Bundle ID</code></strong> := <Team-ID>.com.company.XXX，<Team-ID> 其实也可以不用，但 Apple 的标准用法是以 <Team-ID> 作为 Group Bundle ID 的 prefix。</p>
<p>每个 Sandbox App Group 会在 <em><code>~/Library/Group Containers</code></em> 下生成一个对应的目录，以 Group Bundle ID 命名。该目录的结构与 Sandbox app 的 Container 目录结构相同。该目录可以被属于该 group 的所有 Sandbox app 访问，没有限制。访问该目录的方法是调用 <em><code>[[NSFileManager defaultManager] containerURLForSecurityApplicationGroupIdentifier:]</code></em>。</p>
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