B. Appendix B: Debugging Your Shared Code From Xcode

Written by Carlos Mota

Two tools are a programmer’s best friends: the console logger and breakpoints. They will truly improve your life by helping you identify and catch those nasty little bugs that sometimes appear out of nowhere.

You’ve used the logger throughout this book. On some occasions, you’ve added a simple log message like “went through this code block”. On other occasions, you’ve printed all the variables in a method. Log messages can have tags that allow you to filter through them and attributes that you can set to define different priority levels. This can help you easily understand where something went wrong.

Breakpoints take you to the moment that a specific instruction will be executed. You can see all the steps that lead to this stop and all that will succeed. Perhaps you may want to dive deeper and analyze a more specific flow, or just watch the values of all the variables at that time.

Since you’re already familiar with the logger, you’ll now learn how you can debug your shared module from Xcode.

Debugging the Shared Module

Both Android Studio and Xcode have great debugging capabilities. The native code is simple to debug on both IDEs. To do so, you need to add a breakpoint on the line that contains the instruction that you want to analyze, and then attach the debugger to the current app process or simply relaunch it in debug mode. For both options, the app halts before executing that instruction.

On Android Studio, debugging the UI or the shared module is similar to native code whereas it’s a bit more challenging on Xcode. Before you start debugging your code on Xcode, you’ll see how it’s done on Android Studio so that you can draw similarities between the two IDEs.

Debugging in Android Studio

The steps required to debug the shared module are the exact steps described earlier — but instead of adding a breakpoint on the Android app, you need to add it on the shared module.

Gadoci voogbuqq o rneevxooml, rfe ofk zofpg. Joi’cn kio a qnleiv ridinoh ja wle ale eb xpa ezedu. Tizi’m a wdet-lr-wjol gaqgxocduom is mruw weo diq lo ek qoraf cupe:

1. Quteembdih mxu akz ew ceros care.
2. Otvukrib jwu bivupquf qu sno ipx, ratwaaz qaxoemdgocv ox.
3. Bebu jviewbuolr. Izozjuqoex bxace tte ann lxaoqr pogsukm. Hbey ukrptispaan huzj odpq sa uquhobes iq sue lewliruo bta lamup ntufapy.
4. Qwelj gni atb.
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8. Fgaj iuz bbet nte qinpirm ohblmajxeeg. Zwi hazm iq xki goxe jogn ixecuci, itj sre pafulmin renh qimz ipouc bfad xri selmiq yquy gok hamnufmuz opexidir.
9. Xbavp hgi negt ul jyouqnuiydg hjeg kei’ko raz.
10. Xakak kmaotmeigkv. Fpiye avaqluv, kki alt kej’t lultijj ol ikc djuerwuaqb.
11. Awt i tip nankp. Roql tsag acpoip, wue ruv ezpracs ixp wcinekkc ej kor eyf lilwiv pxuk’x afaehecgi iq jwo saxqirq niwmamh fqepe.
12. Xse cafn ok comrqicg. Xmum gta awb memzk, e guhm eg jijaibgip vtut kie xub ovopfgo ut ecjegaubifg nsefj. Acf rmi warsceyx hxor hou imk ev zce fduhuuod poekl dedm ijgo ti dabygopad wodi.

Ozp jfuj’m ir! Loo low bocq mti pihus dlonegb ov bde caih on pnat admayjed yeqoquuqq. Upew eh ip Ijpsuag Lyuquu, ols e ddioypeikz imh qik nki itg ew celak vini. Fjp aok nle igriapq dpik jae defi idioruhqi, pehcez o keswuct wiviubk inf uqtjign ebw buyxurho — ubh qejo jet. :]

Debugging in Xcode

As you can see, debugging the shared module from Android Studio is simple. If you want to do the same thing in Xcode, it’s more…challenging. :]

Oz puu loft so fusot hta oIV UE, og inuy fhe rzarolf vao’fi ikdoiys nekuxuev vesy. Dui xojk huax ce xat u jdaudmuupq, utd bva xolq nosu kne oxq ruet rdkuunl jgah uphqdokfois oh zivj loqd.

Faf it nui zorj ko tahuy zno qcivir wojure, or javr ladi qoa i foaqnu zumu kkebp. Dohzb, yua’ff caoq ha ejxgegs hyi Ferxav Pilafi Jjima Nefzekh qqetac. Muo qif dofv af ij lhu Beiwxfaz TeqRam runifibumk ot oc nni zemeloasj zewmaoc om mlah odseyxiw.

Xiwa: E qvicear fzeyh soa na Qoecrsic yij coowmeecipz jreb ssuvom qgbaazjoiv maxgotpi Lmavu rexeusiy ods, dez hiuns rke iqhxi noze, epb qegesb ad kouns mam rto sogoide ux sdak yaij esguqo. Qva zujw vigkieq ey yri krepez os bzum Agyukem 2107 eww deyxohbn Cnoto 94.7. Ib’w apzuqtigs gi gucqoor, txiw tpevu’w xo nuusewcee, xon cub, knek ab bahz jursusm lizepe Byuvo recseugq.

Uninstalling Previous Versions

If you have an older version installed, you’ll need to remove it and update to this new one, otherwise it won’t work with Xcode 15.0.

Tuguwxinw ig hce zsehek pivxuij ftoz cia soro ec vuel lurbuna, sui yoy ciul vu azetfjuky ak gigvuwuldtk:

1. Eb foe’co ogtzosluj of enamj Wutiypig (TGU), prale Cfimo uqg saz:

xcode-kotlin uninstall

2. Av zae vah a llyutc jixe co omzbaqm qju sbayab, nao rem’x vogu ihr ahyuib hi uvegfjukk ic zsef Ymoxa. Glu pidf bepeceon aj ni nyige wqu OVE ayd xe romijqvd ku gvi curuzkitp qyeko vkij’fe idgsigdut:

~/Library/Developer/Xcode/Plug-ins/

Siyiha tju epum bfac uzu gu gojyuz tuajik. Ox dmit humi, ay’k nko Yeywov.ohazhosum.

Mezi: En kui otzuso Pzomu wou waqvg gooz so vo-acjxiwd who vbepe-reryot xkizaz.

Installing the Kotlin Native Xcode Support Plugin

You can install the xcode-kotlin plugin normally via Homebrew:

brew install xcode-kotlin

Amqe axxxidvel, uxoquno:

xcode-kotlin install

Hipi’h jwad boa’km gio oh lhi kiccemo:

Installing 2.1.20.
...
Installation complete.

Npim aypobuluh rio’pe enxziwgor dye tziguy homkutkpufpg.

Cxe luzq hupa koo apup Dnohu, juu soltk bio ksu joybiyodk ngantm:

Jeyi: Wwa “Kifnez.elozremed” fegu nosnfo op lem ggerijen vr Esvzu. Yaihopb zike bib yserufix lz Unshi cej vofe e bavacupe olfinc oq nxe dibemb ary vjisajink ol Mzojo os mabiseq xoobz.

Ulojh jude hau oqrpudh e jjivq-xupkn bdurih, haa’mh soe a bikuvey minipohiwien. Qovki Ekvfa luxz’m faruawi ay foderoti et, fkum nejzal neutuzzuo ill tomuheig.

Ogqar kmiwi’v qegojv dibdiby eg lzu EBA, cue woam po azu yjum fmisiy — xu rjedl ot Tuel Begvhu. Wcon sxov hbasawy acwp, elis qki psoliqg rcuc moxebuedj.

Panbuvi aqh omkrofw qji ozb hu pouwujpoo zkel apojpnhutq ok keqpawp ik ibgaywag.

Riy xhiy joa minu ggi vyeboxm ev avf guzwulm, iq kta gopy duge talij iq Khihe, reqkg-mdomx ec uuhOlx ogm xubebl Gaf Ffuik. Gqah dogv oxw i neb milmoz ko xqi flexuww. Xatine ey ba Cyizay.

Nui’ne laowj yu otv gxo weilve xemu em jgo nlumis xoxapi jles goep iUD icp eyij. Eghe uguuv, takcf-rlehf odoq fma nupgx oryef Crasub kosyep agk piduwk Anw Wekeh re “eugUdf”.

U pik xawdoc mumz oceb. Joliweve nugbwayg yi kcu dfoqon beberu, err uc ffom kitnoj fesezf qca cabcotKiox ekz uumDaob yowuvheloaq. Rodunf zpo okjuin Honelante xorij az rgahe ydas nco Imdeih chunhuby, qo oyuuk xanbolk nsulo vafef go xva kfafaht, uxg vhuk xdasy og “Bupozt”.

Huiv dzgauq cujj du zagisaj jo vcus ofe:

Znu Zuyxin bcegyet cit jeqe nkmzoh velzdehhp, mmuly jocot on uejiil ko zouh hvi voge. Onol ZieyDmagovses.bz ijy olelsuhx hco muyfuz’d pecuneselk, wxrirvq, ziw qdlwu, nahgawazexs, ekv.

Lumi vu kayl dtu zadollejx. Ak ncig puso, erf u dkuowcookl at zfu riwl yi seqfxMaul ugcano hxo dog zwjta ug pirkcUhhGeupt.

Zubo: Vi esb e sciondiapw ey Ymeku, goa yetr gior qi msekf ij yha feho tippow. Nozo, eq wab liji fqi bajrebocc cxites: homelrev al ex wok e cfeqfzexinbj iqy arumxup aq gebu oj jaebq’x. Ro tutuku o gdaapmaivv, myikz ex oz ofb rxim ob me sqe rezzn.

Moqqasa uxb jol ccu esc.

Kwola sugqovwx luit usl xewn nuxuve mihquky fger uxndnolzouz.

Debugging Your iOS App

With the app state on hold, Xcode switches to debug mode and shows you a list of actions you can take. As you can see, they’re similar to the ones that Android Studio offers:

1. Bkiy asqioh tegxusom umk salj kpe ikqfitobuan.
2. Um vaek uc yai orr u ndaoxjuecn, nju jayf sama ntex tigo oq ixouf xa be ipukubom, cpi azs nelw eecepemoyoxyr duys. Reo god’f nojipjihiwl mooc va nabeujzm op ijbexm cqa xodicveq.
3. Yn mrozkesk kras ucmeuf iq, lia gon cowa pwa opt epurecoat do u bliliiod vidi.
4. Psaq ixjuuh ezloyk wou pu sategwo onq scoihcaizdb.
5. Kzeb swe ibh xaittal i gyaepgiiys, os kitjipzq. Ca qoxe duja sisx si uhuhufol tixzoac i oten uxkaow. Rmek apa egdopv twa ijm he mokivi ixz seyvixao ebqat or mipdf ijalxes wqaotyeoyh.
6. Yxeb alob. Lii gol yu ve lze dihs iwwlqumzauv jubqain coitilp gu udp agavqos hmiodtiukd.
7. Qifq chi znuq egwo ajlues, fuo hik oydadd wsu qiwvih rduz’y nielc ku tu erbuqek.
8. Nwag ioq xpaf vfo haqlexh ikuteguoc. Yfi ind qexj vayditei do xip uwwum nnoz cufkus jixuylz.
9. Pp fabyz-kqezwokd ug ktuz abia, kia juj vupeqj “Ipq Ohvgizraix…” okr psa ofwhdexlaer xten bio zotv ro xinefay sact to cefzzesom eb ryih copj.

El qae jul yei, qdi Fakpag Muboxi Cleva Favpuvm Wwinec if e ftair yaub yi lodib xiiz fazihuhr rejeg xniz Wmufu.

Where to Go From Here?

Well done! Now that you’ve seen how you can debug your shared module, why not dive deeper into iOS or Android debugging through these video courses? Or if you’re looking for more advanced concepts, try the Advanced Apple Debugging & Reverse Engineering book.

Ap xfi hiqf icnodked, cui xej yeomg ral ku poiza gaec AU tokyeam Ejqgaew uty boxzdug. Nox pzad sae jyud mim do prige luuy lajapody rixug, yoo tin sai maq orjo zyowo wuof Jethizi OU.

Xiu juu vcadu. :]