Video: NSManagedObject hauv Swift yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
NSManagedObject . Ib chav kawm hauv paus uas siv tus cwj pwm xav tau ntawm a Cov ntaub ntawv tseem ceeb qauv khoom.
Qhov sib thooj, NSManagedObject yog dab tsi hauv cov ntaub ntawv tseem ceeb?
NSManagedObject yog chav kawm uas koj cuam tshuam nrog feem ntau thaum koj ua haujlwm nrog Cov ntaub ntawv tseem ceeb . Cov chav kawm yuav tshwm sim raws li phau ntawv txhais lus muaj koob meej, tab sis nws muaj ntau tshaj qhov ntawd.
Tsis tas li ntawd, NSFetchRequest yog dab tsi? NSFetchRequest . Cov lus piav qhia ntawm cov txheej txheem tshawb nrhiav siv los khaws cov ntaub ntawv los ntawm lub khw muag khoom tsis tu ncua.
Hais txog qhov no, cov ntaub ntawv tseem ceeb hauv Swift yog dab tsi?
Cov ntaub ntawv tseem ceeb yog ib lub moj khaum nrov tshaj plaws muab los ntawm Apple rau iOS thiab macOS apps. Cov ntaub ntawv tseem ceeb yog siv los tswj cov qauv txheej khoom hauv peb daim ntawv thov. Koj tuaj yeem kho Cov ntaub ntawv tseem ceeb raws li lub moj khaum txuag, taug qab, hloov kho thiab lim cov cov ntaub ntawv Hauv iOS apps, txawm li cas los xij, Cov ntaub ntawv tseem ceeb tsis yog Database.
Yuav ua li cas yog lub thawv tsis tu ncua hauv Swift?
Cov thawv ntim muab peb cov cuab yeej hu ua viewContext, uas yog cov ntsiab lus tswj hwm cov khoom: ib puag ncig uas peb tuaj yeem tswj hwm cov ntaub ntawv tseem ceeb hauv RAM. Lub sijhawm no, peb lub app muaj cov qauv ntaub ntawv ua haujlwm nrog rau cov lej txhawm rau thauj nws mus rau hauv cov ntsiab lus tswj hwm kev nyeem ntawv thiab sau ntawv.
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