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杭城小刘
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# iOS应用启动性能优化资料汇总
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[WWDC](https://everettjf.github.io/2018/08/06/ios-launch-performance-collection/#wwdc)
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[文章](https://everettjf.github.io/2018/08/06/ios-launch-performance-collection/#%E6%96%87%E7%AB%A0)
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[工具](https://everettjf.github.io/2018/08/06/ios-launch-performance-collection/#%E5%B7%A5%E5%85%B7)
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[代码](https://everettjf.github.io/2018/08/06/ios-launch-performance-collection/#%E4%BB%A3%E7%A0%81)
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[偏门古董](https://everettjf.github.io/2018/08/06/ios-launch-performance-collection/#%E5%81%8F%E9%97%A8%E5%8F%A4%E8%91%A3)
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[书籍](https://everettjf.github.io/2018/08/06/ios-launch-performance-collection/#%E4%B9%A6%E7%B1%8D)
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[总结](https://everettjf.github.io/2018/08/06/ios-launch-performance-collection/#%E6%80%BB%E7%BB%93)
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发现好资料就整理到这里，_随时更新，最后一次更新2018年8月6日_
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# WWDC
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1. Optimizing App Startup Time
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必看官方资料，从底层到上层[https://developer.apple.com/videos/play/wwdc2016/406/](https://developer.apple.com/videos/play/wwdc2016/406/)
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2. App Startup Time: Past, Present, and Future
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dyld层面的优化[https://developer.apple.com/videos/play/wwdc2017/413/](https://developer.apple.com/videos/play/wwdc2017/413/)
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3. Optimizing I/O for Performance and Battery Life
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IO是启动性能的重要影响部分[https://developer.apple.com/videos/play/wwdc2016/719/](https://developer.apple.com/videos/play/wwdc2016/719/)
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4. Practical Approaches to Great App Performance
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现场一步一步解决性能问题[https://developer.apple.com/videos/play/wwdc2018/407/](https://developer.apple.com/videos/play/wwdc2018/407/)
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5. Using Time Profiler in Instruments
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TimeProfiler是必备好帮手[https://developer.apple.com/videos/play/wwdc2016/418/](https://developer.apple.com/videos/play/wwdc2016/418/)
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6. High Performance Auto Layout
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App首页如果是AutoLayout的，那么以后看来不是问题了[https://developer.apple.com/videos/play/wwdc2018/220/](https://developer.apple.com/videos/play/wwdc2018/220/)
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7. Core Image: Performance, Prototyping, and Python
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首页当然也有大量的图片，了解Core Image[https://developer.apple.com/videos/play/wwdc2018/719/](https://developer.apple.com/videos/play/wwdc2018/719/)
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# 文章
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**以下文章仅仅是收集，各家之谈，不要全信，也不要反对，各有道理，学习思路即可。**
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1. 即刻技术团队：iOS app 启动速度研究实践
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地址[https://zhuanlan.zhihu.com/p/38183046?from=1086193010&wm=3333\_2001&weiboauthoruid=1690182120](https://zhuanlan.zhihu.com/p/38183046?from=1086193010&wm=3333_2001&weiboauthoruid=1690182120)学习思路。
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2. iOS Dynamic Framework 对App启动时间影响实测
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[https://www.jianshu.com/p/3263009e9228](https://www.jianshu.com/p/3263009e9228)动态库的测试。可知：启动过程中尽量不要加载动态库了。
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3. Optimizing Facebook for iOS start time
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[https://code.fb.com/ios/optimizing-facebook-for-ios-start-time/](https://code.fb.com/ios/optimizing-facebook-for-ios-start-time/)Facebook的思路。虽然Facebook的启动很慢。
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4. Bugly: iOS App 启动性能优化
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[https://mp.weixin.qq.com/s/Kf3EbDIUuf0aWVT-UCEmbA](https://mp.weixin.qq.com/s/Kf3EbDIUuf0aWVT-UCEmbA)这篇文章最后透露了一个很给力的思路。强烈推荐仔细看文章最后。
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5. 今日头条iOS客户端启动速度优化
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[https://techblog.toutiao.com/2017/01/17/iosspeed/](https://techblog.toutiao.com/2017/01/17/iosspeed/)文章开头的信息很多，但减少代码量，貌似很难行得通。
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6. 如何精确度量 iOS App 的启动时间
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[https://www.jianshu.com/p/c14987eee107](https://www.jianshu.com/p/c14987eee107)文章的思路可参考。
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7. 优化 App 的启动时间
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[http://yulingtianxia.com/blog/2016/10/30/Optimizing-App-Startup-Time/](http://yulingtianxia.com/blog/2016/10/30/Optimizing-App-Startup-Time/)主要是对WWDC的笔记，但仍然很给力。南萧玉，北子棋。这篇文章就是南萧玉所作。
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8. 手淘iOS性能优化探索
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[https://github.com/izhangxb/GMTC/blob/master/%E5%85%A8%E7%90%83%E7%A7%BB%E5%8A%A8%E6%8A%80%E6%9C%AF%E5%A4%A7%E4%BC%9AGMTC%202017%20PPT/%E6%89%8B%E6%B7%98iOS%E6%80%A7%E8%83%BD%E4%BC%98%E5%8C%96%E6%8E%A2%E7%B4%A2%20.pdf](https://github.com/izhangxb/GMTC/blob/master/%E5%85%A8%E7%90%83%E7%A7%BB%E5%8A%A8%E6%8A%80%E6%9C%AF%E5%A4%A7%E4%BC%9AGMTC%202017%20PPT/%E6%89%8B%E6%B7%98iOS%E6%80%A7%E8%83%BD%E4%BC%98%E5%8C%96%E6%8E%A2%E7%B4%A2%20.pdf)这是GMTC 2017手机淘宝专家的技术分享，可以参考。
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9. iOS应用启动性能优化\(1\)-premain
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[https://everettjf.github.io/2018/05/26/ios-app-launch-performance-part1/](https://everettjf.github.io/2018/05/26/ios-app-launch-performance-part1/)仅仅是pre-main阶段的思路。作者说有后续的文章，但很久没动静了，不知道在搞什么。
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10. 一种 hook objective c +load 的方法
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[https://everettjf.github.io/2017/01/06/a-method-of-hook-objective-c-load/](https://everettjf.github.io/2017/01/06/a-method-of-hook-objective-c-load/)这篇文章的hook比较麻烦，其实还可以参考上面的一篇文章[https://www.jianshu.com/p/c14987eee107](https://www.jianshu.com/p/c14987eee107)，这里有批量hook +load的代码。（未来我也有计划会把这些相关代码整理到一个repo中）
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11. 一种 hook C++ static initializers 的方法
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[https://everettjf.github.io/2017/02/06/a-method-of-hook-static-initializers/](https://everettjf.github.io/2017/02/06/a-method-of-hook-static-initializers/)这篇文章的hook方法，有较大的可能是我首创，强烈推荐。手淘的分享中也提了这个方法。
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12. 一种延迟 premain code 的方法
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[https://everettjf.github.io/2017/03/06/a-method-of-delay-premain-code/](https://everettjf.github.io/2017/03/06/a-method-of-delay-premain-code/)通过学习Facebook的App中特有的section（参考文章[https://everettjf.github.io/2016/08/20/facebook-explore-section-fbinjectable/](https://everettjf.github.io/2016/08/20/facebook-explore-section-fbinjectable/)），发现的一种思路。
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# 工具
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1. TimeProfiler
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都知道是啥。
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2. AppleTrace
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[https://github.com/everettjf/AppleTrace](https://github.com/everettjf/AppleTrace)使用 HookZz hook了objc\_msgSend，会有较大性能损耗，但可根据相对比例来知道大概的耗时占比。另外也手动定义开始结尾生成chrome tracing。
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3. DTrace
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只能用于模拟器。使用方法可参考这本书：Advanced Apple Debugging & Reverse Engineering[https://store.raywenderlich.com/products/advanced-apple-debugging-and-reverse-engineering](https://store.raywenderlich.com/products/advanced-apple-debugging-and-reverse-engineering)
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4. Xcode 环境变量
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DYLD\_PRINT\_STATISTIC 及其他类似环境变量[https://developer.apple.com/library/archive/documentation/DeveloperTools/Conceptual/DynamicLibraries/100-Articles/LoggingDynamicLoaderEvents.html](https://developer.apple.com/library/archive/documentation/DeveloperTools/Conceptual/DynamicLibraries/100-Articles/LoggingDynamicLoaderEvents.html)
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# 代码
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1. FastImageCache
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[https://github.com/path/FastImageCache](https://github.com/path/FastImageCache)优化图片加载的速度。空间换时间。
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# 偏门古董
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1. Code Size Performance Guidelines
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[https://developer.apple.com/library/archive/documentation/Performance/Conceptual/CodeFootprint/Articles/MachOOverview.html](https://developer.apple.com/library/archive/documentation/Performance/Conceptual/CodeFootprint/Articles/MachOOverview.html)页面最下面提出的思路很好，但文章是gcc时代的了。有没有clang时代对应的呢。 Improving Locality of Reference[https://developer.apple.com/library/archive/documentation/Performance/Conceptual/CodeFootprint/Articles/ImprovingLocality.html\#//apple\_ref/doc/uid/20001862-CJBJFIDD](https://developer.apple.com/library/archive/documentation/Performance/Conceptual/CodeFootprint/Articles/ImprovingLocality.html#//apple_ref/doc/uid/20001862-CJBJFIDD)
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# 书籍
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1. Pro iOS Apps Performance Optimization
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貌似比较古老，仅参考。
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2. iOS and macOS Performance Tuning
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很细致，我正在看。有中文翻译版。
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3. High Performance iOS Apps
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有中文翻译版。
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# 总结
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上面的文章我都看过，或者至少是正在看，总结下来，辅助大家优化启动性能。
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---
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转载于：https://everettjf.github.io/2018/08/06/ios-launch-performance-collection/
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