DispatchGroup yog dab tsi?
DispatchGroup yog dab tsi?

Video: DispatchGroup yog dab tsi?

Video: DispatchGroup yog dab tsi?
Video: AsyncStreams Intro in Swift (Concurrency) – 2022 2024, Hlis ntuj nqeg
Anonim

DispatchGroup . Ib pab pawg ua haujlwm uas koj saib xyuas raws li ib chav tsev.

Dhau li ntawd, vim li cas DispatchGroup siv rau qee lub sijhawm?

DispatchGroup tso cai rau aggregate synchronization ntawm kev ua haujlwm. Nws tuaj yeem yog siv xa ntau yam khoom ua haujlwm sib txawv lossis thaiv thiab taug qab thaum lawv ua tiav, txawm tias lawv yuav khiav ntawm cov kab sib txawv. tos() ib yam nkaus uas thaiv cov xov tam sim no kom txog thaum pab pawg ua haujlwm tiav..

Ib tug kuj yuav nug, DispatchQueue yog dab tsi? DispatchQueue . Ib yam khoom uas tswj hwm kev ua tiav ntawm cov dej num serially lossis concurrently ntawm koj app lub ntsiab xov los yog hauv keeb kwm yav dhau xov.

Ua li no, pawg xa khoom hauv Swift yog dab tsi?

Nrog xa pab pawg koj ua tau pab pawg ua ke ntau yam haujlwm thiab tos kom lawv ua tiav, lossis tau txais kev ceeb toom thaum lawv ua tiav. Cov haujlwm tuaj yeem ua asynchronous lossis synchronous thiab tuaj yeem khiav ntawm cov kab sib txawv. DispatchGroup tswj xa pab pawg . Koj yuav xub saib nws txoj kev tos.

Semaphore hauv Swift yog dab tsi?

A semphore suav nrog cov xov kab thiab tus nqi suav (hom Int). Counter tus nqi yog siv los ntawm cov semphore los txiav txim seb ib tug xov yuav tsum tau nkag mus rau ib tug sib koom pab los yog tsis. Tus nqi counter hloov thaum peb hu signal() lossis tos() ua haujlwm.

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