Testing Rork Max SwiftUI Features on a Real Wallpaper App — What Worked, What Needed Fixes

Features That Needed Work: Generated, Then Fixed

Category Tab Navigation

Beautiful HD Wallpapers organizes wallpapers by category — Nature, Architecture, Abstract, and so on. I asked Rork Max to implement category-based navigation, and it returned a TabView-based implementation.

TabView is technically correct. The problem is that in a wallpaper app, TabView initializes all tab views at once, which means all category grids — and their image loading — start simultaneously. On a device with moderate RAM, this becomes a problem quickly.

My actual implementation uses a custom lazy tab pattern where only the visible category's view is initialized. I chose this explicitly to control memory pressure.

Adding "why" to the spec prompt fixed this:

"Please implement category tabs as a custom lazy-loading solution rather than TabView.
Reason: wallpaper apps loading high-res images across all tabs simultaneously causes
RAM spikes. I need only the active category to be initialized at any given time."

With this addition, Rork Max generated an appropriate ScrollView + LazyHStack pattern with visibility-based initialization.

Verdict: Default output uses standard patterns that are correct in general — but app-specific performance constraints need to be spelled out. This is a prompt quality issue, not a model limitation.

Slideshow with Auto-Advance Timer

The slideshow feature (auto-advancing full-screen wallpaper display) is something I reverse-ported from the Android version to iOS in the most recent update. Rork Max generated a working basic version, but with a lifecycle bug I've seen trip up many developers.

// Generated code (before fix) — Timer not cancelled on disappear
.onAppear {
    Timer.scheduledTimer(withTimeInterval: 3.0, repeats: true) { _ in
        withAnimation {
            currentIndex = (currentIndex + 1) % wallpapers.count
        }
    }
}

Two problems here. First, no onDisappear cancellation — the timer keeps running after the view is gone, which leads to crashes when it tries to update a deallocated view. Second, no background state handling — when the app goes to background, the timer should pause.

Here's the pattern I use instead:

class SlideShowTimer: ObservableObject {
    var timer: Timer?
 
    func start(interval: TimeInterval, action: @escaping () -> Void) {
        stop()
        timer = Timer.scheduledTimer(withTimeInterval: interval, repeats: true) { _ in
            action()
        }
    }
 
    func stop() {
        timer?.invalidate()
        timer = nil
    }
}
 
struct SlideShowView: View {
    @StateObject private var slideTimer = SlideShowTimer()
    @State private var currentIndex = 0
    let wallpapers: [Wallpaper]
 
    var body: some View {
        TabView(selection: $currentIndex) {
            ForEach(wallpapers.indices, id: \.self) { index in
                WallpaperFullView(wallpaper: wallpapers[index])
                    .tag(index)
            }
        }
        .tabViewStyle(.page(indexDisplayMode: .never))
        .onAppear {
            slideTimer.start(interval: 3.0) {
                withAnimation {
                    currentIndex = (currentIndex + 1) % wallpapers.count
                }
            }
        }
        .onDisappear { slideTimer.stop() }
    }
}

Verdict: Generated code works in the happy path but has lifecycle issues. Always audit onAppear/onDisappear symmetry in generated code — this category of bug is invisible in short testing sessions.

Features I Wrote by Hand: Where Rork Max Hit Its Limits

UIKit Bridge for Wallpaper Setting

The wallpaper-setting feature (saving to camera roll, setting as home/lock screen) requires UIKit's UIImageWriteToSavedPhotosAlbum and the Photos framework, wrapped in UIViewControllerRepresentable for SwiftUI integration.

Rork Max generated a UIViewControllerRepresentable wrapper, but it didn't handle the PHPhotoLibrary.requestAuthorization async flow correctly. Specifically, the permission request was handled synchronously, causing a crash when Photos access hadn't been granted yet.

The pattern that works:

func requestPhotoLibraryAccess() async -> Bool {
    let status = PHPhotoLibrary.authorizationStatus(for: .addOnly)
    switch status {
    case .authorized, .limited:
        return true
    case .notDetermined:
        let granted = await PHPhotoLibrary.requestAuthorization(for: .addOnly)
        return granted == .authorized || granted == .limited
    default:
        return false
    }
}

This async/await pattern correctly handles the permission flow. The Rork Max version mixed synchronous and asynchronous calls in a way that was error-prone. For anything touching Apple's permission APIs, I recommend writing by hand or at minimum carefully auditing every generated line.

Verdict: Skip generation for permission-sensitive flows. The failure mode is a crash that only appears when the user hasn't granted access — hard to catch in testing, bad when it reaches production.

ATT Prompt Ordering

This one isn't a code quality issue — it's a sequencing issue that the generated code gets wrong in a way that doesn't cause obvious errors but breaks expected behavior silently.

Across the four iOS apps I updated in May 2026, the ATT prompt (ATTrackingManager.requestTrackingAuthorization) must be called before MobileAds initialization. Getting this backwards results in the ATT dialog not appearing on some devices, which means users are tracked without consent — a potential App Store rejection reason.

Rork Max generates the initialization in the reverse order. Always check ATT ordering manually.

Practical Guidelines for Building Wallpaper Apps with Rork Max

Here's the framework I'd give someone starting a wallpaper app with Rork Max today:

Trust the UI layer. Grid layouts, animations, transitions, custom components — Rork Max's SwiftUI output is reliable here. The declarative nature of SwiftUI plays to the generator's strengths, and complex animations often come out with the right approach without additional prompting.

Always review lifecycle and async code. onAppear/onDisappear symmetry, async cancellation, background state transitions — generated code frequently handles the happy path but misses edge cases. I caught a double-fire timer bug in the Beautiful HD Wallpapers slideshow during pre-release testing that had been there since I first generated the feature. It only showed up after returning from background.

Write permission flows yourself. Photos, ATT, push notification permission flows are where generated code diverges from what Apple actually requires. The failure modes are hard to catch in normal testing and can cause review rejections or production crashes. Ten minutes of writing by hand is worth it here.

Add "why" to your specs. Telling Rork Max "use a custom lazy tab instead of TabView because of RAM pressure in image-heavy apps" produces measurably better output than just describing the desired behavior. The model responds well to constraints when they're made explicit.

Integrating AdMob with Rork Max-Generated Views

For wallpaper apps, advertising is a primary revenue stream. When integrating AdMob banners into Rork Max-generated SwiftUI views, the key is using the correct rootViewController access pattern:

struct BannerAdView: UIViewRepresentable {
    let adUnitID: String
 
    func makeUIView(context: Context) -> GADBannerView {
        let banner = GADBannerView(adSize: GADAdSizeBanner)
        banner.adUnitID = adUnitID
        // Correct pattern for iOS 15+ — keyWindow is deprecated
        banner.rootViewController = UIApplication.shared.connectedScenes
            .compactMap { $0 as? UIWindowScene }
            .first?.windows
            .first?.rootViewController
        banner.load(GADRequest())
        return banner
    }
 
    func updateUIView(_ uiView: GADBannerView, context: Context) {}
}

Rork Max-generated AdMob integration sometimes uses UIApplication.shared.keyWindow, which is deprecated since iOS 15. This works but generates warnings, and Apple may strengthen enforcement in future SDK versions. Use the connectedScenes pattern instead.

For the May 2026 updates across my four iOS apps, I added Liftoff, InMobi, and Unity Ads as mediation partners within AdMob, configured across 20 ad groups with optimization toggled on for eCPM-based dynamic ordering. The manual mediation setup is completely separate from Rork Max — but the views that display the ads were generated with Rork Max and then adjusted for the AdMob integration pattern above.

Multi-Resolution Support for Newer iPhone Models

One wallpaper-app-specific challenge that Rork Max doesn't handle well is resolution targeting for newer iPhone models. As of May 2026, you need to cover iPhone Air (420×912), iPhone 17 Pro (402×874), iPhone 16/17 Pro Max (440×956), and a growing list of past models.

Beautiful HD Wallpapers manages this through 29 conditional expressions in DefineManager.h. Rork Max generates basic screen-size branching code, but the pixel-exact constants for 2025–2026 models aren't included. You'll need to reference Apple's Device Screen Specifications directly and add the constants manually.

struct WallpaperSize {
    static var optimal: CGSize {
        let screen = UIScreen.main.bounds.size
        let scale = UIScreen.main.scale
 
        switch (Int(screen.width * scale), Int(screen.height * scale)) {
        case (1320, 2868): return CGSize(width: 1320, height: 2868) // iPhone 16 Pro Max
        case (1206, 2622): return CGSize(width: 1206, height: 2622) // iPhone 15/16 Pro
        case (1290, 2796): return CGSize(width: 1290, height: 2796) // iPhone 14/15 Pro Max
        default:           return CGSize(width: screen.width * scale, height: screen.height * scale)
        }
    }
}

This table needs updating with every new iPhone release. Maintain it yourself rather than relying on generated code for this.

Where Generated Code Breaks First: Memory, Not Layout

I listed the LazyVGrid above under "features that worked," and that's accurate — but only about the structure. The moment I pointed the generated AsyncImage at real wallpaper data, an iPhone 11 died within a minute of continuous scrolling.

The reason is mechanical. AsyncImage decodes whatever it downloads at the image's own dimensions. If your thumbnail endpoint serves full-size assets, each decoded bitmap costs width × height × 4 bytes. A 1290×2796 wallpaper is roughly 14.4 MB on its own. Keep thirty of those alive across a three-column grid and its neighbouring rows, and you are past 400 MB before any ad SDK has loaded. LazyVGrid does not release offscreen cells immediately, and AsyncImage carries no cache — scroll back up and you pay for both the download and the decode a second time.

This is not a flaw in Rork Max. Nothing in the phrase "a three-column grid" tells it that 4K assets are coming down the wire. That constraint belongs in the spec, and leaving it out was my omission.

Decide the decode size before you decode

The fix is to shrink during decoding rather than after. CGImageSourceCreateThumbnailAtIndex gets you to the target size without ever materialising the full-resolution bitmap.

enum ImageDownsampler {
    static func downsample(data: Data, to pointSize: CGSize, scale: CGFloat) -> UIImage? {
        let sourceOptions = [kCGImageSourceShouldCache: false] as CFDictionary
        guard let source = CGImageSourceCreateWithData(data as CFData, sourceOptions) else { return nil }
 
        let maxPixel = max(pointSize.width, pointSize.height) * scale
        let thumbOptions = [
            kCGImageSourceCreateThumbnailFromImageAlways: true,
            kCGImageSourceShouldCacheImmediately: true,
            kCGImageSourceCreateThumbnailWithTransform: true,
            kCGImageSourceThumbnailMaxPixelSize: maxPixel
        ] as CFDictionary
 
        guard let cgImage = CGImageSourceCreateThumbnailAtIndex(source, 0, thumbOptions) else { return nil }
        return UIImage(cgImage: cgImage, scale: scale, orientation: .up)
    }
}

Two option flags matter more than they look. kCGImageSourceCreateThumbnailFromImageAlways stops Core Graphics from reusing the thumbnail embedded in the JPEG — those are usually far too small, and wallpaper grids show the softness immediately. kCGImageSourceShouldCacheImmediately forces the decode to finish inside this function, so you never get a late decode landing on the main thread mid-scroll.

Put a bounded cache in front of it

NSCache will evict for you under memory pressure, provided you give it a totalCostLimit and pass byte counts as the cost.

actor ThumbnailStore {
    static let shared = ThumbnailStore()
 
    private let cache: NSCache<NSString, UIImage> = {
        let c = NSCache<NSString, UIImage>()
        c.totalCostLimit = 48 * 1024 * 1024   // 48 MB
        return c
    }()
    private var inFlight: [String: Task<UIImage?, Never>] = [:]
 
    func thumbnail(for url: URL, pointSize: CGSize, scale: CGFloat) async -> UIImage? {
        let key = "\(url.absoluteString)|\(Int(pointSize.width * scale))"
        if let cached = cache.object(forKey: key as NSString) { return cached }
        if let running = inFlight[key] { return await running.value }
 
        let task = Task<UIImage?, Never> {
            guard let (data, _) = try? await URLSession.shared.data(from: url) else { return nil }
            return ImageDownsampler.downsample(data: data, to: pointSize, scale: scale)
        }
        inFlight[key] = task
        let image = await task.value
        inFlight[key] = nil
 
        if let image, let cg = image.cgImage {
            cache.setObject(image, forKey: key as NSString, cost: cg.bytesPerRow * cg.height)
        }
        return image
    }
}

The inFlight dictionary exists to collapse duplicate requests. Fast scrolling makes the same cell start loading repeatedly, and the naive version decodes the same image several times in parallel — which is precisely when your peak footprint spikes.

The call site becomes a thin replacement for AsyncImage:

struct WallpaperThumbnail: View {
    let url: URL
    let side: CGFloat
    @State private var image: UIImage?
 
    var body: some View {
        Group {
            if let image {
                Image(uiImage: image).resizable().aspectRatio(1, contentMode: .fill)
            } else {
                Color.gray.opacity(0.3)
            }
        }
        .frame(width: side, height: side)
        .clipped()
        .task(id: url) {
            image = await ThumbnailStore.shared.thumbnail(
                for: url,
                pointSize: CGSize(width: side, height: side),
                scale: UIScreen.main.scale
            )
        }
    }
}

.task(id: url) is doing quiet but important work here. With onAppear, a recycled cell leaves its previous load running; a task with an explicit id cancels the old load the moment the view's identity changes.

Verify with numbers, not with a feeling

To avoid declaring victory prematurely, I log headroom on device. os_proc_available_memory() returns how many bytes remain before the system terminates the app.

#if DEBUG
import os
 
func logMemoryHeadroom(_ label: String) {
    let available = Double(os_proc_available_memory()) / 1_048_576
    os_log("[mem] %{public}@ available=%{public}.1fMB", label, available)
}
#endif

Below is what I recorded on an iPhone 11 (4 GB) while scrolling a three-column grid through 200 rows. This is one device and one dataset, so read the gaps rather than the absolute values.

The cache earns its place through feel more than through peak numbers: returning to a row you already visited no longer re-decodes, so the scroll stops hitching.

There is a cost. Downsampling during decode uses more CPU — 6–9 ms per image on an A13 in my measurements. Kept inside a Task it never showed up in scrolling, but on older hardware you may need to cap concurrency.

Rewrite the prompt, not just the code

After this, I changed how I describe the screen to Rork Max. Instead of "a three-column grid," I now write: "a three-column grid; assets are served at full 4K, so downsample during decode to the cell's display size; keep a bounded cache and coalesce concurrent requests for the same URL into one." Since making that change, generated code arrives with downsampling and caching already in place far more often. It is the clearest example I have of the earlier guideline — telling the model why raises the quality of what it writes.

Final Assessment

Rork Max's SwiftUI generation meaningfully reduces the cost of building UI. What used to take two weeks of UI implementation now takes a few hours to scaffold. That's a real improvement for indie developers.

What hasn't changed is the distance between "code that appears to work" and "code that works reliably in production." Timer lifecycle, async permission flows, memory-conscious architecture — these require the kind of knowledge that comes from shipping apps and watching them fail in the specific ways that only long-running production reveals.

I've been writing iOS code since the early App Store days. The category of bugs that Rork Max misses is the same category that caught me off guard ten years ago: bugs that only appear after a background/foreground cycle, after the user denies a permission, after twenty minutes on a low-memory device.

Use Rork Max to accelerate the UI layer, and bring your own experience to the production-readiness layer. That combination is what actually works.

If you haven't tried Rork Max's SwiftUI generation yet, start with one screen from a project you know well. You'll see what it does well and where you need to add your own judgment within the first hour — that's the fastest way to calibrate how to use it effectively.