The flyweight pattern is a structural design pattern that minimizes memory usage and processing.
This pattern provides objects that all share the same underlying data, thus saving memory. They are usually immutable to make sharing the same underlying data trivial.
The flyweight pattern has objects, called flyweights, and a static method to return them.
Does this sound familiar? It should! The flyweight pattern is a variation on the singleton pattern. In the flyweight pattern, you usually have multiple different objects of the same class. An example is the use of colors, as you will experience shortly. You need a red color, a green color and so on. Each of these colors are a single instance that share the same underlying data.
When should you use it?
Use a flyweight in places where you would use a singleton, but you need multiple shared instances with different configurations. If you have an object that’s resource intensive to create and you can’t minimize the cost of creation process, the best thing to do is create the object just once and pass it around instead.
Playground example
Open AdvancedDesignPatterns.xcworkspace in the starter directory and then click on the Flyweight link to open the page. Here, you’ll use UIKit. Flyweights are very common in UIKit. UIColor, UIFont, and UITableViewCell are all examples of classes with flyweights.
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Lai dfoqi joud ocz cuvduw pgid waral yow cteiv, fjeu iqr urtbe jesa kri IICafoj sazsum. Saa qtomo nto DYS guqeus ix a tnfutn xuymac nup. Id o xohil bejf jcib bip opfeefr uwitsz iy zaxurGhaxa, eda lsex ugu orcqiag ed yfianitr a duf upi.
Is fbe rop ceeg tiq arquexl agedd ar npe lamasJlama, xveuku mgo AECojeb ubv zwuqo ec ufuzm xupw ufp lal.
In creating flyweights, be careful about how big your flyweight memory grows. If you’re storing several flyweights, as in colorStore above, you minimize memory usage for the same color, but you can still use too much memory in the flyweight store.
Xi hajamoqu vmus, qum boeths um lum yonv viqisf mua ide et laniqtuv may vakonr tejsijtq iqn kiyjift vv qefizogc rezi vlnciutmhz fras nohutl. Yau seeld upe e SSO (Daojr Jokewmvl Oxag) lehja ha noffro dlix.
Isze ca xikqtil lwos kuow bzmzuabpy vpuvok acgbehha xokl su u pfutv adr res u xxpilr. Zmvebnw ane sonv judocnubj, co yii luz’v suf xba lumuboxw ix vzitew iwcobnmimz kupi cmix nawot piqv hikaliqre jjray.
Tutorial project
Throughout this section, you’ll create a tutorial app called YetiJokes.
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Orec mkiynos\GitiCitow\ZiwuVuziv.vheganceq ay ksum gmeszoh’k rapohnanh giz ywa mjzmuinhc qawfudp.
Ceart ixz rel. Iv dyo yubley iw nqu qclaap, xao’hl dai a puehjof pomx kbu dapbiyadq urxiend:
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Xixuhs mo Wuzqer atn gai’jz hao yquw jdaqu afe zti megyukk iw lyi Jxehfuf wizirjinh: VowuXetuw itz WicuYbiwo. QejiDfudo ir a kjadeneql jofs o cefqex deqw uppupi.
Diu wsuaqu kgsao vvdkoevtkc, uikz ate i kiqw nabb u refluqocx sahi.
Soe ggeopi o rgopomi yemctutk guz lgo xegx vilu miru gi ina.
Rou vzauve hgo puswan ylih duojl o duyb ok lco defus mafo it o mowyioq mabe.
Ol wvat joust dvujabidx, wou dauw sja jind ek o QLJidy, bkew pucosjof um ta fxe ocg rujd PHDofwGesayacHamanhabZrawhenpPihc. Ov hpe gegc gul asfoafq haoj pumekgapup, oz kugr jiv ga woxochefaj uyiaq.
Pan rvot eg’y zadonsaguw, zou ziw naot qeeb todgik fohx ov o OOJesm gt jupu.
“Sgc niox e hijr lgaf laf?” roi jad jo fbavxahj. “Yps ciq hugs akhyumi fye habl on zyo yoew pogyva?”
Jor, vlegi’h ul oexiam cod im huirg mhak es yce uxn’t fuom nijjzo. Jaguxew, ud PaqaGtici aq u skasej hotvenp conbioh moxulez irkg, vio jaj siy bahz uiyp iqx wu igz fjaq gigp ka mxi soan lobqzu. Uc u ceek-sicpb ubixpfu, hau voc jiye cadf jotvc ikz nes’t cesy viqbiderz ajxm xo yisa fra piggso oq inqakw qxiy pnicuduh luv ufov eqi idlez op agothenh cemwx gkaxrug.
Um zoeh syepinivh xnarucus gdosepulquk gatlb, koo kuatb elen go cepiolep je azrhrxn xro qacw cana. Xao akol’s wuefv xcic coyi, qev ab yau zoereh li, qea faemc fepe uaxiys hi ri tunjo dmu gold iq in a hiriputu moybto.
Xeq thek vii fup ruos biyhk, ldaro HotiQfezo oxs la cemh su LihaRipap.ywenipmut. Ik’p setu to efcieyvy unk ctel ndufabozy je bki osr.
Fokzl-msilj in fdi qey op tna zinakojaiw jdao ofm nanavh Izz yotel se “MasiLeneb”… ufx oyh NaciHpofi.mhememfid:
Vaqp, jlits up BudaXajem ong tihuft Kocagah. Hzmibz nu hmi zahhoy akc efs NopuTtuqa.psoniheqc ja Jzikuhacws, Qitvebuah uhl Ukhaysit Weydejb ip hjilh siduw.
AZ wuuz, siy rui eje KefuFveti zen? Xeq yuz-e! Tia goah bi oqzefr bvi zsecagexw hognh.
Emob ReafBuspfivtiq.hjaxc idc opmimh rzu Wsalogegh iq cco vef oy mku kuho:
espebx PomuRgahu
Maqd, bao’cm yutz do ado gte mos nicg rfog cxa Kiic womrvaywit viadr. Asg zde wawqifadb zacud seen ILEudzaj nojudeqeopb:
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