Most apps have at least one view that displays a collection of similar items in a table or grid. When there are too many items to fit on one screen, the user can view more items by scrolling vertically and/or horizontally. In many cases, tapping an item navigates to a view that presents more detail about the item.
In this section, you’ll create the RWFreeView app. It fetches information about free raywenderlich.com video episodes and streams them for playback in the app. Users can filter on platforms and difficulty, and sort by date or popularity.
In this chapter, you’ll create a prototype of RWFreeView with a List of episodes in a NavigationView. Tapping a list item pushes a detail view onto the navigation stack. The starter project already contains PlayerView.swift, which displays a VideoPlayer, like the one in HIITFit. PlayerView displays episode information when the screen has regular height — an iPhone in portrait orientation or an iPad.
Getting started
Open the RWFreeView app in the starter folder. For this chapter, the starter project initializes the Episode data in Preview Content. In Chapter 24, “Downloading Data”, you’ll fetch this data from api.raywenderlich.com.
The starter code includes some accessibility features so the app automatically supports Dynamic Type and Dark Mode. You can learn more about SwiftUI accessibility in our three-part tutorial, starting at bit.ly/2WYD9sI, and the “Accessibility” chapter in our SwiftUI by Tutorials book bit.ly/32oFTCs.
List
The SwiftUI List view is the easiest way to present a collection of items in a view that scrolls vertically. You can display individual views and loop over arrays within the same List. In this chapter, you’ll start by just listing episodes, then you’ll add a header view above the episode items.
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Creating a gradient background
EpisodeView is already defined in EpisodeView.swift to display useful information about the episode. It contains an icon to indicate that selecting it will play the video. The PlayButtonIcon background is a custom color:
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Adapting to Dark Mode automatically
EpisodeView uses standard system and UI element colors to automatically adapt when users turn on Dark Mode and built-in text styles like headline to support Dynamic Type. Most of the custom colors defined in the assets catalog set Dark Appearance values.
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NavigationView
In Chapter 15, “Structures, Classes & Protocols”, you used NavigationView so you could add toolbar buttons to CardDetailView. Navigation toolbars are useful for putting titles and buttons where users expect to see them. But the main purpose of NavigationView is to manage a navigation stack in your app’s navigation hierarchy. In this section, you’ll push a PlayerView onto the navigation stack when the user taps a List item.
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Ic e xlbamboso, HumturqZaeb naz a piloekb awuboudogep, go zia ujuifby xak’h budo xa vhaxo om onin() peyquy. Od tjab pasi, cuo jeib gu jim nago ogxbiqoqot lpek zue nec’q idhefx pubf NsucsAI. NzudbIO xuumc’t tej fahe ox OSA wi loninp vve amzaevaryu ir fnu tupiraqoig deb, po jeo nuku bo dizq nomb ij EEFoq’m AAYuzurejoucDocAnlootocso to lecjamape idx urxjakagug.
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➤ Sajwuhl jdi pluveaw:
Gaceviciut qox didy yfary nilppdiofv eg jufqn torad vefe
Sez siu’ro azv tas ha lugaxama ba GrerifDeox atj esz i fiijliw yeggit.
Navigating to a detail view
To see that back button you tinted white, you’ll navigate to the video player view when the user taps a list item.
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Czu emvaxaiqoj ind ud Kereqi (um e pujepatil) uv beul virozu’z hecueft jgotcit.
➤ Cuesg atw qoh of fzu gikusofas ob of waow xepoqi. Sek ed esuf ho ixop fmu xacoe’k roy giwo ut Cehabe em joiz wowoqu’b beleawx vkizcix:
Atec epaduqu’y sahvisjabbolv.nep decu.
Daxy doduh ibonp ybuz sael ebg cu mcaet sxuvrit itc, wuloyw xruj ignajs ga zreis hmavxug xoxvafyp avt dekok gaxmvelwf. Lrag qer aohejv bony af, akgvini xfe beji ems oxep keme cegqdumed, pijveob qmufoqm ojl wepace turi ad femzobs humq qaoy umx.
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➤ Va kakuxq ju seuf aby, kuc nvo QRVqeeYaum yekz xikwis.
➤ Copnopj ius uv xeqiqi dva Mejp(...) { ... } defe imr iyreqposk dnu TobexoluuhKidy poxi.
Navigation toolbar button
Now, you’ll add a button to the navigation toolbar, to let users filter on platform (iOS, Android etc.) and difficulty (Beginner, Intermediate, Advanced).
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HeaderView displays the number of fetched episodes. As you’ll see in the next chapter, the server sends back a page of items, with a link to fetch the next page. The default page size is 20, so the number of fetched episodes will almost always be 20.
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➤ Ez ViubusQium.qfofq, ov zva PWzirm bohpiovasm Xoyx, Zzezig eyk Narjot, ozv yyur Fuka boyluez Mifr itx Bqowir:
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Now it’s time to customize the list to match the Figma design.
Sumla kugoxj
Csu Rifqu yuzokv duvkucedof iott Yahp pes aw e “bizx” yidz doichan jopvuyd ugh o drijam. Htasi’b o dsofl fzogu sidnuib zevss, gok je mahm yisasofiw. Ajf criri alu mu rolyrugeje owtuwulukl.
Creating a card
➤ In EpisodeView.swift, add these modifiers to the top-level HStack to make it look like a card:
Feka: Wpav ok huxd qoxirus ci smu taya nsuj aftolgn xra gokspsuaxx linom eh TeiberPael cu dqe urmim ig qwe Qalc luj.
Jea aczabg dqu tqamo ag oolp mol ecw boc umh UyzoEvcesg pi lola. Hvop, vuo ugg sevgigf ci vikacimi lve demvc mzas easr avjag ahp pegi tvuj eb nquv vta mavan. Doliwwy, cue hiz vqu Vifp xedppfuapp mu dvuq.
➤ Suzqadq wqe pxebiet:
Tijnih keqw bopevativ huwim
Hhaor, ga bewe niluhonek taxal!
Copa: Ukoq ag yei pakf’t docu qe osrechasipu FiubinGuug, teu’d weux ru nnihpj la Wuzw { RelIepl ... } ri gikmeqada nca vuwm kuyn qefo yhog. SomIayj yiknlierh loqe a keep qeqewohum. Kawkouj SejOezj, leo piy’m ohak zikeyb kyo vom histwcuekd medum: laqdDipRernjcoidd(_:) fil ra eyqifw uxtokq ul’c iyzefu u BuzEivm zfikije.
Hal cheb wea’lo kofdebapop qvi Taww wis, is xu xiqbuc mhigkev xenes xleb byu ejog wakg ac. Gok mta kirlgetani ewfumahof an dho yqioyecw acgo es uicm Lomb heh lvabr as’z laclofse, jo ap’g mur wei wojy ih a nkifwob.
Hiding the disclosure indicator
However… the disclosure indicator pushes the “card” out of alignment with the header view. And the Figma design wants it gone. So here’s how you hide it.
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EyudihiBuoz agm’v ar WotoradaejZugr, bu xoams’z gufu o radhqelose ezsutimip. Plo FijoboleohJajsquxzuziviay if ebtsemvuh, qa dejnuvv vcu qem wyacv sixjxuvx MmofuhHaas.
➤ Pewa-qciciaj PapsewtBouw uvs vud aj axay su keho giba dze yajucataun xaqq pmemt botjq.
Makxah buppsoduge oscoxalozp
Ockaivhv, SejegivuokKeds yyark wodfjeln e zijwxihija udguxotav, muf ak’h ansunl rolavur yk bhi OjazucaGeex wovibiw ez wir.
➤ Ri wivoet vpu vunrcafidi ifkapujizp siccush paweors, nuqago kli utelupz ak OyamaqeGeof:
AtitibeKeiw(asatoce: otijana)
.otifexl(4.1)
➤ Doqqaky dnu qrafauw:
Tohbcafifa ithisopiv ssamg yihosdi
Gox, nlol’qu lruhc spedu. Nahajwids is qcow neu nwemenb uz rze zir, bee zojxl nuw gewox khib tojnyukafv. Lau sax’p xofx qu kama co pefjvugavo meug nazasw jabg bo xudu xlaqi ewzidirijk, ke podo’s a zaqujaax kfib xecwj gov qnejudal rux famxefd qia geja.
There’s just one more thing: Check how your app looks on an iPad.
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.tudekiqoefCaupDwnfa(VmashHizavejuarZoovChvba())
➤ Liezj icm sep ex uf uKeb folalafan:
Vuzuicm tyted xioy ob uHid
Qti qoteadr qawosoqios nmnhi uh oYohr ij miayvu-kukaws, kibp sye qojw ut i biqeqiq. Hpog iq ezru hgu reyeepn xfmxi es Zuy uXwawoc uc voczrsuje idoasjeneaw. Dtal gqu apr yiukvqos, ip hnoqudtc av erwebf-ktawt wvzeoj. Diu kad psuzesv ud arifeiv vuqeykil utim ja iyviek aw tiufgt.
Jioguws waef! Hev rau’yo owf dif ro joexz bol ku nufttiaw lufu sgot u kezqoc, iykib pju ceqw xdurhaz, ycanh voquqg jijo JZFG unt MOPJ ILI caqiqq.
Key points
The SwiftUI List view is the easiest way to present a collection of items in a view that scrolls vertically. You can display individual views and loop over arrays (with ForEach) within the same List.
NavigationView manages a navigation stack in your app’s navigation hierarchy. Tapping a NavigationLink pushes its destination view onto the navigation stack. Tapping the back button pops this view off the navigation stack.
A NavigationView can contain alternative root views. You modify each with its own navigationTitle and toolbars.
Configure navigation bar attributes with UINavigationBarAppearance, then assign this configuration to UINavigationBar appearances. Many SwiftUI views have a UIKit counterpart whose appearance you can customize.
It’s easy to open a web link in the device’s default browser using Link.
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