開發者週報 #93 WFH 時怎麼樣才不會 WTF

Apple/iOS 開發者的一週大小事 2021/05/24-2021/05/30

May 30, 2021

13的話

提醒一下 WWDC 就快到了。就算你沒有空參加，也要留點時間把第一天 Keynote、State of the Union 兩場看完。
很多人不知道這兩場的差別，前者其實是對媒體與大眾，介紹一些新功能、新名詞。後者才重點針對開發者，把新技術、新的 API 列出來，這樣你就知道接下來要追哪些 sessions。
（看前一期 · 回首頁）

🍴WWDC21 網站圖片玄機

是 Eat, Sleep, Code 的意思嗎？

Jane Manchun Wong @wongmjane

WWDC 2021 products: 🍴 Apple Fork and Knife 😴 Apple Sleep 💻 MacBook developer.apple.com/wwdc21/

💡WWDC21 Digital Lounges

今年多了直接跟 Apple 工程師的線上聊天室。6/1 開始免費註冊，人數有上限請把握機會。

🆕What’s New in Swift 5.5

覺得最近太閒、想預習 WWDC 的話可以先讀。先說，這網頁印成 A4 至少也要 25 頁。我把標題跟作者的相關推文列一下：

Async/await

Paul Hudson @twostraws

Async/await functions allow us to run complex asynchronous code almost is if it were synchronous. It doesn't make them concurrent – that's a separate change! – but it does make for beautifully clean API.

A Swift 5.5 function marked with the async keyword. Inside it awaits three other asynchronous functions, then prints a final result.

Async/await: sequences
Effectful read-only properties

Paul Hudson @twostraws

Last but not least, read-only properties can now be marked using async and/or throws, making them much more at home in Swift 5.5's asynchronous world.

A Swift struct that loads a filename from the app bundle and returns its contents. The contents are available through a property that is marked both async and throws, because it might take time to execute and might fail.

Structured concurrency

Paul Hudson @twostraws

Structured concurrency lets us create tasks and task groups to execute work concurrently, wait for it to complete, or cancel it as needed.

Code that calculates the first 50 numbers of the Fibonacci sequence using Task so that it executes concurrently.

async let bindings

Paul Hudson @twostraws

Async let bindings allow us to create concurrent tasks easily, then wait for all them to complete later on. The tasks start running immediately, making this really lightweight syntax.

A Swift 5.5 function that uses async let to start three child tasks, then uses await to wait for all three to finish before using them together.

Continuations for interfacing async tasks with synchronous code
Actors

Paul Hudson @twostraws

Actors are like classes that are designed to be safe to use in concurrent environments, because Swift automatically ensures their mutable state is only ever accessed by a single thread at any given time. 👋 Race conditions!

A Swift 5.5 actor that has a deck of cards and can safely trade them with another user.

Global actors

Paul Hudson @twostraws

@ MainActor lets us ensure that a function or property is used only on the main thread. Swift will automatically queue up any work to happen there, as if we had used DispatchQueue.main ourselves.

A data controller class that uses @MainActor on its save() method, to ensure saving data is done safely.

Sendable and @Sendable closures
#if for postfix member expressions

Paul Hudson @twostraws

"#if for postfix member expressions" sounds obscure, but if you know you know – and you'll be really glad this one has landed.

A SwiftUI text view followed by a #if condition that attaches one of two font sizes depending on the operating system.

Allow interchangeable use of CGFloat and Double types

Paul Hudson @twostraws

The Swift compiler can now implicitly insert initializers to convert between CGFloat and Double, which is going to make many APIs (not least SwiftUI) so much nicer!

A Swift snippet that shows a CGFloat being added to a Double with no problems.

Codable synthesis for enums with associated values

Paul Hudson @twostraws

Swift 5.5 sees another welcome upgrade for Codable: it now supports enums with associated values!

A Swift enum with various associated values attached to its cases; the whole thing conforms to Codable.

lazy now works in local contexts
Extend property wrappers to function and closure parameters
Extending static member lookup in generic contexts
And there’s still more…

☠️M1RACLES 漏洞

Apple Silicon M1 硬體層面的漏洞。實際上沒有那麼嚴重，不過這個網站的 FAQ 寫得很有趣，不怕英文的可以讀一下。

🫓iMac 有多薄

比 iPhone 一代還薄。

Kate @whoiskatrin

something to think about

順便跟大家說一下，iMac（不算腳架）的體積只比 Mac mini 多 17.5%。

13 @ethanhuang13

🖥睡前突然想來算 iMac M1 的體積。官方沒給不含支架的高，故用寬推算。總共是： 54.7 × 26.1 × 1.15 ≈ 1642 cm³ 相較之下，Mac mini： 19.7 × 19.7 × 3.6 ≈ 1397 cm³ iMac 竟然只比 Mac mini 多 17.5% 而已當然 M1 小體積王者是 iPad Pro 11 吋 24.76 × 17.85 × 0.59 ≈ 261 cm³ #買都買 #來睡

🤪Random Tweets

論用 Twitter 學技術：

龙爪槐守望者 @ftium4

我来推特想学技术，所以关注了很多独立开发者。结果熊猫吃短信的开发者在迷恋小护士；落格输入法的作者在转黄图；pastenow开发者在探咖啡店，技术屁也没学到，黄图倒是攒了一堆😂

好孩子不要學：

Kosta Eleftheriou @keleftheriou

The review: “This app forced me to give it a good rating before I could use it.” You: “Pfff, no one’s FORCING you!” The app: 🤯

只要有螢幕的地方就能...

Twitterとかインスタで見たやつ試しにやってみたらできた！カッコいい！これで未来に帰れる！⚡️🕰

Arie Peretz @LionKing2303

My imagination going wild right before #WWDC21 is like: Xcode for WatchOS

不知道從哪看到的我就想轉一下

阿米娜・阔伊姆@頑張らない？ @jamella_hoshino

This is fine.

__難哥 @joe_trash_talk

《火神的眼淚 - 軟體工廠篇》不知道有沒有搞頭？🤔

This Is Fine GIF

🎙weak self podcast 76: 在家工作！WFH 時怎麼樣才不會 WTF

資深聽眾你沒有看錯，節目標題 reuse 了。這次是由有五年 WFH 經驗的波肥來分享絕招。

校正上架 了🤪

💼職缺/履歷交流區

求職履歷：

Richard Liu (LinkedIn)

如果你有 iOS 相關職缺或是求職履歷想要刊登在「13 的開發者週報」，請見關於。

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