Borkware Quickies

(General->Hacks)

Sun, 16 Feb 2025 20:41:05 UTC

Getting a really annoying warning with nothing actionable when implemented secure (de)coding?

*** -[NSKeyedUnarchiver validateAllowedClass:forKey:] allowed unarchiving safe plist type ''NSString' (0x1ec071f50)
[/Library/Developer/CoreSimulator/Volumes/iOS_22B81/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS
18.1.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/Foundation.framework]' for key '', 
even though it was not explicitly included in the client allowed classes set: 
'<decode: bad range for [%{public}@] got [offs:647 len:474 within:0]>'. 
This will be disallowed in the future.<decode: bad range for [%{public}@] 
got [offs:1121 len:1 within:0]>

you can set this breakpoint to break there. (wouldn't it have been nice if they had mentioned that in the warning?):

-[NSCoder _warnAboutPlistType:forKey:missingInAllowedClasses:]

Adding a new environment value (SwiftUI->Random)

Sun, 24 Dec 2023 02:33:07 UTC



private struct ScreamAtMeKey: EnvironmentKey {
    static let defaultValue = false
}

// Set via .environent(\.screamAtMe, true)
extension EnvironmentValues {
    var screamAtMe: Bool {
        get { self[ScreamAtMeKey.self] }
        set { self[ScreamAtMeKey.self] = newValue }
    }
}

// Set via .screamAtMe(true)
extension View {
    func screamAtMe(_  aaaaaah: Bool) -> some View {
        environment(.screamAtMe, aaaaaah)
    }
}

Doing Notifications Swiftstyle (Swift->Random)

Mon, 06 Nov 2023 03:24:09 UTC

Posting end

   NotificationCenter.default.post(name: Notification.Name("FishBattery"), object: tour)

Receiving end

NotificationCenter.default.addObserver(
    forName: Notification.Name("FishBattery"),
    object: tour,
    queue: OperationQueue.main) { [weak self] notification in
        guard let tour = notification.object as? Tour else {
            return
        }
        if tour == self?.tour {
            self?.uploadIfNeeded()
        }
    }

Making a simple button (SwiftUI->Random)

Sun, 22 Oct 2023 16:35:30 UTC



Button("Button Text") {
    print("Snorgle")
}

Making a custom button style (SwiftUI->Random)

Fri, 06 Oct 2023 14:55:50 UTC



struct CustomButtonStyle: ButtonStyle {
    func makeBody(configuration: Configuration) -> some View {
        configuration.label
            .padding()
            .background(.purple)
            .foregroundStyle(.green)
            .clipShape(RoundedRectangle(cornerRadius: 25, style: .continuous))
            .scaleEffect(configuration.isPressed ? 2.0 : 1)
            .animation(.easeOut(duration: 0.05), value: configuration.isPressed)
    }
}

(please don't actually make buttons with this style...) And then attach it to something (say an individual button, or a top-level view) like

        .buttonStyle(CustomButtonStyle())

Easily giving buttons a border/background (SwiftUI->Random)

Fri, 06 Oct 2023 14:41:54 UTC

I still dislike the iOS 7 "here's some random blue text. Really, it's a button". I like buttons to look like buttons. You can add a `.buttonStyle` to a view, and it'll apply the style to al the buttons inside.

Here's the different out of the box styles. You can also make your own custom button style.

        .buttonStyle(.bordered)  // gray filled oval
        .buttonStyle(.borderedProminent) // blue filled oval
        .buttonStyle(.borderless) // default (I think) - free floating random blue text
        .buttonStyle(.plain)  // free floating random plain text. that's also a button

Exposing documents directory to Files / Finder (Hacks->Random)

Tue, 03 Oct 2023 01:18:25 UTC

Set these both to YES in the Info.plist

UIFileSharingEnabled
LSSupportsOpeningDocumentsInPlace

Default to a particular tab bar tab (SwiftUI->Random)

Tue, 03 Oct 2023 00:48:52 UTC



enum Tab: Hashable {
    case simplePlan
    case complicatedPlan
    case multiPlan

    var id: Self { self }
}

struct ContentView: View {
    @State private var tab = Tab.complicatedPlan

    var body: some View {
        TabView(selection: $tab) {
            SimplePlan(captureModel: SimpleCaptureModel.shared)
              .tabItem {
                  Label("Simple Plan", systemImage: "house")
              }
              .tag(Tab.simplePlan)
            CompliPlan(captureModel: CompliCaptureModel.shared)
              .tabItem {
                  Label("Complicated Plan", systemImage: "house.circle.fill")
              }
              .tag(Tab.complicatedPlan)
            MultiPlan()
              .tabItem {
                  Label("Multi Plan", systemImage: "house.lodge")
              }
              .tag(Tab.multiPlan)
        }
    }
}

Wrapping a UIView (SwiftUI->Random)

Sat, 30 Sep 2023 23:52:06 UTC

Given a UIView, add it to SwiftUI via UIViewRepresentable.

struct PlaceholderContainerView: UIViewRepresentable {

    func makeUIView(context: Context) -> PlaceholderUIView {
        return PlaceholderUIView()
    }

    func updateUIView(_ uIView: PlaceholderUIView, context: Context) {
        print("update ui view (context)")
    }
}

Basic Tab View (SwiftUI->Random)

Sat, 30 Sep 2023 23:30:36 UTC



struct ContentView: View {
    var body: some View {
        TabView {
            SimplePlan()
              .badge(23)
              .tabItem {
                  Label("Simple Plan", systemImage: "house")
              }
            MultiPlan()
              .tabItem {
                  Label("Simple Plan", systemImage: "house.lodge")
              }
        }
    }
}

move to previous buffer C-x p (emacs->Hacks)

Sat, 15 Jul 2023 18:52:28 UTC



(global-set-key (kbd "C-x p") 'move-to-previous-window)

(defun move-to-previous-window ()
  "Move to the previous window."
  (interactive)
  (other-window -1))

Turn off xcode's brace-matching animation (Xcode->Hacks)

Tue, 13 Apr 2021 20:48:57 UTC



% defaults write com.apple.dt.Xcode DVTTextShowMatchingBrace -bool NO

I <3 Zach Waldowski for this tidbit.

Silencing Macbook power chime (Unix->General)

Thu, 08 Aug 2019 17:55:37 UTC

The modern-day flutterby keyboard Macbooks make a soothing (?) chime when plugged in to power, even if the system volume is muted. If you don't want to hear that, you can do

% defaults write com.apple.PowerChime ChimeOnNoHardware -bool true
% sudo killall PowerChime

Scroll to a particular collection view item. (UIContainerView->General)

Sat, 17 Nov 2018 19:37:34 UTC



- (void) viewDidLayoutSubviews {
    // doing this in viewDidAppear might not work well b/c the collection view might
    // not have completed layout yet
   [super viewDidLayoutSubviews];

   NSIndexPath *indexPath = [NSIndexPath indexPathForItem: self.currentPatchNumber
                                         inSection: 0];
   UICollectionViewScrollPosition scrollPosition =
       UICollectionViewScrollPositionCenteredVertically; // maybe also horizontally if you want

   [self.collectionView scrollToItemAtIndexPath: indexPath
                               atScrollPosition: scrollPosition
                                       animated: NO];

} // viewDidLayoutSubviews

Accessing a class method from an instance. (General->Swift)

Tue, 06 Nov 2018 19:17:04 UTC

Say you have an instance, and you want to call a class method, similar to objc where you could do something like self.class.insets.left. Use type(of: self).methodName()

class Bargle {
    static func greeble() {
        print("Blargle greeble")
    }

    func oopack() {
        type(of: self).greeble()
    }
}

let bargle = Bargle()
bargle.oopack()

This will cause Blargle greeble

sizeof in swift (General->Swift)

Mon, 05 Nov 2018 21:22:34 UTC

Say you have a struct:

struct Thingie {
    let blah: Uint8
    let greeble: UInt8
    let splunge: UInt8
}

Get the sizeof via

let packetLength = MemoryLayout.size

That's the packed size. To account for alignment/padding, use stride.

Making a Data out of an array of UInt8 (General->Swift)

Mon, 05 Nov 2018 21:20:53 UTC



var payload: [UInt8] = [0x09, 0x00, 0x07, 0x00, 0x12, 0x00, 0x64, 0x02, 0x03, 0x04,
                        0x09, 0x81, 0x12, 0x00, 0x07, 0x00, 0x32, 0x04, 0x05, 0x06,
                        0x00, 0x00, 0x00, 0x00]

let bufferPointer = UnsafeBufferPointer(start: &payload, count: payload.count)
let buffer = Data(buffer: bufferPointer)

Make archive of locally modified files in subversion (Subversion->General)

Mon, 07 May 2018 17:43:13 UTC



$ zip ~/modified.zip $(svn status | grep ^M | awk '{ print $2;}')

(Bash syntax)

Sort grep-c (Unix->General)

Sun, 15 Apr 2018 20:45:14 UTC

grep -c will give you the number of hits for the given pattern in each file. It'd be nice to sort them, but the count occurs after the filename, e.g. GreebleBork:23

So, trick sort into using the last field (with a colon separator) as the sort key:

% grep -c translatesAuto *.xib | sort -t: -n -k2

Swift if case let (Swift->General)

Fri, 16 Mar 2018 13:44:02 UTC

Because I can never remember the syntax:

Given

enum FilterOptionValue {
    case oneSided(value: Double)
    case twoSided(low: Float, high: Double)
}

You can unpack it piecewise on demand with

        if case let .twoSided(low, high) = thingieOption.value {
            minThingie = Int(low)
            upperThingie = Int(high)
        }