Async/await共15篇
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What is an asynchronous function?什么是异步函数？
Although Swift functions are synchronous by default, we can make them asynchronous by adding one keyword: async. Inside asynchronous functions, we can call other asy...
5个月前What calls the first async function? 什么调用第一个异步函数？
You can only call async functions from other async functions, because they might need to suspend themselves and everything that is waiting for them. This leads to a bit of a chicke...
5个月前What is a synchronous function? 什么是同步函数？
By default, all Swift functions are synchronous, but what does that mean? A synchronous function is one that executes all its work in a simple, straight line on a single threa...
5个月前How to use continuations to convert completion handlers into async functions 如何使用 continuations 将完成处理程序转换为异步函数
Older Swift code uses completion handlers for notifying us when some work has completed, and sooner or later you’re going to have to use it from an async function –&nbs...
5个月前Sending data safely across actor boundaries 跨参与者边界安全地发送数据
Swift tries to ensure access to shared data is done safely, partly through types such as actors, and partly through a concept of sendability implemented through the ...
5个月前How to create continuations that can throw errors 如何创建可以抛出错误的continuations
Swift provides withCheckedContinuation() and withUnsafeContinuation() to let us create continuations that can’t throw errors, but if the API you’re using ...
5个月前How to store continuations to be resumed later 如何存储要稍后恢复的 continuations
Many of Apple’s frameworks report back success or failure using multiple different delegate callback methods rather than completion handlers, which means a simple continuation won...
5个月前How to call async throwing functions 如何调用异步 throwing 函数
Just like their synchronous counterparts, Swift’s async functions can be throwing or non-throwing depending on how you want them to behave. However, there is a twist: although we ...
5个月前What’s the performance cost of calling an async function? 调用 async 函数的性能成本是多少？
Whenever we use await to call an async function, we mark a potential suspension point in our code – we’re acknowledging that it’s entirely possible our function w...
5个月前How to call an async function using async let 如何使用 async let 调用 async 函数
Sometimes you want to run several async operations at the same time then wait for their results to come back, and the easiest way to do that is with async let. This lets you start...
5个月前