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遇到的 XC 8 中的两个小坑.html
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遇到的 XC 8 中的两个小坑.html
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遇到的 XC 8 中的两个小坑
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<p>今天可能时运不济，一次碰到了两个小坑，趁着现在 pod repo update 的时候记一下。<br><a id="more"></a></p>
<h2 id="Background-Fetch"><a href="#Background-Fetch" class="headerlink" title="Background Fetch"></a>Background Fetch</h2><p>今天在一开始在写和 Background Fetch 相关的代码。把 performFetchWithCompletionHandler 写好，然后其他的配置做好之后，连上手机准备测试。因为一般 Background Fetch 发生都需要时间，而且这个调用的时间间隔是系统定的，即使设定了 setMinimumBackgroundFetchInterval(UIApplicationBackgroundFetchIntervalMinimum) 可能也要蛮久一段时间系统才会调用。所以一般都会点 Xcode -> Debug -> Simulate Background Fetch 让 Background Fetch 能立即执行来方便调试。</p>
<p>所以我当然也是要点的。<br>结果我期待的结果并没有和以前一样发生，程序居然奔溃退出了，就像这样。</p>
<p><img src="http://p1.bpimg.com/4851/100d68e61bc45fa2.png" alt="Markdown preferences pane"></p>
<p>我开始以为是自己代码有问题，于是调试了一会儿，最后发现即使我在方法里什么都不做调用的时候还是会奔溃。有点懵。然后我在模拟器上试了一发，结果发现并没有任何问题！调用是成功的！</p>
<p>Google 了一发，在 Apple Developer Forums 里看到了一篇贴 ( <a href="https://forums.developer.apple.com/thread/51361" target="_blank" rel="external">https://forums.developer.apple.com/thread/51361</a> )，也有人在 Xcode 8 上遇到了一样的情况：</p>
<p><img src="http://p1.bpimg.com/4851/544f7a16ca99aeee.png" alt="Markdown preferences pane"></p>
<p>然而最后是怎么解决的呢？当然不是等20分钟让他自然发生调用。你会发现在真机上点击后的奔溃是 Xcode 自己断开的，然后你再轻轻的点一下继续执行按钮，它就把我的 Background Fetch 执行好了。</p>
<p><img src="http://p1.bpimg.com/4851/6cef865f9bef302d.png" alt="Markdown preferences pane"></p>
<p>Fun.</p>
<h2 id="UNNotificationSound"><a href="#UNNotificationSound" class="headerlink" title="UNNotificationSound"></a>UNNotificationSound</h2><p>还有就是关于 UNNotificationSound 的问题。</p>
<p>我在尝试用 iOS 10 新的 UserNotification 来创建通知，一个本地通知，其他的一切都没有问题，然而自定义的提醒通知的声音就是无法播放。并且以前创建通知写法的代码是没有问题可以播放的。</p>
<p><img src="http://p1.bpimg.com/4851/960c9bffa8db51e8.png" alt="Markdown preferences pane"></p>
<p>从苹果的文档 ( <a href="https://developer.apple.com/reference/usernotifications/unnotificationsound" target="_blank" rel="external">https://developer.apple.com/reference/usernotifications/unnotificationsound</a> ) 看到 UNNotificationSound 支持由 Linear PCM ／ MA4 (IMA/ADPCM)／ µLaw ／ aLaw 封装成的 aiff, wav, caf 几种格式的文件。我也转换了几种格式都试了下想确定是不是格式的问题，而无论怎么测试，系统始终播放的是默认的三连音：哒哒哒。</p>
<p>然后我又遇到了一样处境的人（这次的人比较多），还是在 Apple Developer Forums 里的帖子（ <a href="https://forums.developer.apple.com/thread/49512" target="_blank" rel="external">https://forums.developer.apple.com/thread/49512</a> ）。</p>
<p>有人好像找到了暂时解决的方法：重启 iOS 设备，卸载 App ，然后重新安装，自定义的铃声就可以生效了。但是有人说这种方法在你使用 Xcode 再装 App 的时候又会失效了。</p>
<p><img src="http://p1.bpimg.com/4851/313c960e725367c2.png" alt="Markdown preferences pane"></p>
<p>但是无论如何，我的自定义铃声一直没有播出来。<br>Magic.</p>
<h3 id="？？？"><a href="#？？？" class="headerlink" title="？？？"></a>？？？</h3><p>天冷了，Macbook 的散热变好了。</p>
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