xcode Apple 推荐的 Swift 日志记录方法
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Apple Recommended Logging approach for Swift
提问by user1046037
Note:
笔记：
This is not a duplicate of the linked questions
这不是链接问题的重复
Goal:
目标：
- I am not looking for a
printvsNSLogdifferences - In fact I don't want to use either of them (presently using
print) - I am looking for an Apple recommended way, just can't seem to find the command / documentation, I just know it exists.
- 我不是找一个
printVSNSLog差异 - 事实上，我不想使用它们中的任何一个（目前正在使用
print） - 我正在寻找 Apple 推荐的方式，只是似乎找不到命令/文档，我只知道它存在。
Present implementation:
目前的实现：
Presently I am using printstatements with some global functions
目前我正在使用print带有一些全局函数的语句
Question
题
- What is the recommended way / approach to handle errors (I don't want to use NSLog as they would write into the device's console)
- This is only for debugging purposes during development
- 处理错误的推荐方式/方法是什么（我不想使用 NSLog，因为它们会写入设备的控制台）
- 这仅用于开发期间的调试目的
回答by Honey
Take a look at os_log. It offers all the things you're looking for.
看看os_log。它提供了您正在寻找的所有东西。
Disclaimer:
免责声明：
I highly recommend you see this thread from Swift forums. tl;dr
我强烈建议您从 Swift 论坛中查看此主题。tl;博士
Even though it's' Apple's recommendation, its usage is debated due concerns about retrieving logs:
尽管这是 Apple 的推荐，但由于对检索日志的担忧，它的使用仍存在争议：
- retrieving logs is not a trivial process. It's actually difficult. See here
- For most users the log file can be 100-300 Mbs. Which makes it hard to send.
- 检索日志不是一个简单的过程。其实很难。看这里
- 对于大多数用户，日志文件可以是 100-300 Mbs。这使得发送变得困难。
It's great for debugging during development, but laborious to trigger, retrieve, send by your app users.
它非常适合在开发过程中进行调试，但触发、检索、发送应用程序用户很费力。
Example:
例子：
let customLog = OSLog(subsystem: "com.your_company.your_subsystem_name", category: "Category")
os_log("This is info that may be helpful during development or debugging.", log: customLog, type: .debug)
Some great references:
一些很好的参考：
- WWDC 2016 Unified Logging and Tracing.
- This answerby Rob. He discusses that
NSLogis deprecated and some of the benefits of using the newos_loglibrary. - You can also get the logs from using the approach mentioned here. Make sure you see ?answers.
- WWDC 2016 统一日志记录和跟踪。
- 罗布的这个答案。他讨论了
NSLog已弃用的内容以及使用新os_log库的一些好处 。 - 您还可以使用此处提到的方法获取日志。确定你看到了吗？答案。
The reason os_logis so powerful is because:
之所以os_log如此强大，是因为：
- offers different log levels
- has different categories
privateandpubliclogs- it's lightweight and built by Apple. Doesn't require pods
- unlike
printwhich is only available during debugging,os_logcan be used to peek into a released app (in realtime) and view the logs in the console app.
- 提供不同的日志级别
- 有不同的类别
private和public日志- 它是轻量级的，由 Apple 制造。不需要豆荚
- 与
print仅在调试期间可用的不同，os_log可用于查看已发布的应用程序（实时）并在控制台应用程序中查看日志。
This is great for observing application life cycle changes free of the greedy Xcode. Xcode will not allow the app to be put in a suspended state...
这对于在没有贪婪的 Xcode 的情况下观察应用程序生命周期变化非常有用。Xcode 不允许将应用程序置于挂起状态...
Note:os_logis only available to +iOS10
注意：os_log仅适用于+iOS10
There are new videos as well from WWDC 2018 and 2019, but have a higher focus on os_signpost. See:
还有来自 WWDC 2018 和 2019 的新视频，但更关注os_signpost. 看：
