Using a custom DiscreteFormatStyle in Live Activities

With iOS 18, Text has a new initializer that takes in a TimeDataSource and a DiscreteFormatStyle.

Similar to this question, I'd like to make a compact timer but can't find a way to do that with any of the system formats.

Since the new API takes in a DiscreteFormatStyle though I figure I could make my own. This works in an app but not in a Live Activity; in Previews it crashes and in the simulator the view looks like placeholder.

Are custom format styles not supported in this case? Or might there something wrong with my implementation?

struct CompactCountdownFormatStyle: DiscreteFormatStyle {
    func discreteInput(before input: Duration) -> Duration? {
        // This should be the upper bound of the countdown, in other words, what's the highest start time
        // we support.

        // If our input it already a minute or less then that's our cap
        guard input > .seconds(60) else { return nil }

        // Since our boundary is minutes, what the next minute smaller than our input?
        let minutes = Int(input.components.seconds) / 60

        if minutes <= 1 {
            return nil
        } else {
            return .seconds((minutes - 1) * 60)
        }
    }

    func discreteInput(after input: Duration) -> Duration? {
        if input > .seconds(60 * 60 * 8) {
            return nil
        } else {
            // One minute over the given duration?
            return input + .seconds(60)
        }
    }

    func format(_ value: Duration) -> String {
        let hoursRemaining = Int(value.components.seconds) / 60 / 60
        let minutesRemaining = Int(value.components.seconds) / 60 % 60

        if hoursRemaining > 0 {
            return "\(hoursRemaining):\(minutesRemaining.formatted(.number.precision(.integerLength(2))))h"
        } else {
            return "\(minutesRemaining)m"
        }
    }
}

-------------------------------------
Translated Report (Full Report Below)
-------------------------------------

Incident Identifier: 5751EB73-82FA-4EFC-9177-FAD3D354B63E
CrashReporter Key:   004B4B93-198E-57CA-190B-8A014FEEE541
Hardware Model:      MacBookPro18,2
Process:             PreviewShell [2986]
Path:                /Volumes/VOLUME/*/PreviewShell.app/PreviewShell
Identifier:          com.apple.PreviewShell
Version:             16.0 (22.0.73)
Code Type:           ARM-64 (Native)
Role:                Background
Parent Process:      launchd_sim [6198]
Coalition:           com.apple.CoreSimulator.SimDevice.6041CD63-61AC-49A7-8E95-7501E1840C2F [59813]
Responsible Process: SimulatorTrampoline [2932]

Date/Time:           2024-10-18 13:33:20.9856 -0400
Launch Time:         2024-10-18 13:33:18.9412 -0400
OS Version:          macOS 14.5 (23F79)
Release Type:        User
Report Version:      104

Exception Type:  EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x00000001947677b0
Termination Reason: SIGNAL 5 Trace/BPT trap: 5
Terminating Process: exc handler [2986]

Triggered by Thread:  0

Thread 0 Crashed::  Dispatch queue: com.apple.main-thread
0   libswiftCore.dylib            	       0x1947677b0 _assertionFailure(_:_:file:line:flags:) + 244
1   ChronoKit                     	       0x1d9b9120c 0x1d9a57000 + 1286668
2   ChronoKit                     	       0x1d9b8f7f8 0x1d9a57000 + 1279992
3   ChronoKit                     	       0x1d9b8f3d8 0x1d9a57000 + 1278936
4   WidgetPreviewsShellPlugin     	       0x1d58e3fec 0x1d58ce000 + 90092
5   WidgetPreviewsShellPlugin     	       0x1d58e3178 0x1d58ce000 + 86392
6   WidgetPreviewsShellPlugin     	       0x1d58e6914 0x1d58ce000 + 100628
7   PreviewsFoundationOS          	       0x22f68e424 0x22f5d0000 + 779300
8   PreviewsFoundationOS          	       0x22f5e8a40 0x22f5d0000 + 100928
9   PreviewsFoundationOS          	       0x22f68e3f4 0x22f5d0000 + 779252
10  PreviewsFoundationOS          	       0x22f68ccf0 0x22f5d0000 + 773360
11  PreviewsFoundationOS          	       0x22f68cbe0 0x22f5d0000 + 773088
12  PreviewsFoundationOS          	       0x22f68dc9c 0x22f5d0000 + 777372
13  PreviewsFoundationOS          	       0x22f6018d0 0x22f5d0000 + 202960
14  libdispatch.dylib             	       0x1801774ec _dispatch_call_block_and_release + 24
15  libdispatch.dylib             	       0x180178de0 _dispatch_client_callout + 16
16  libdispatch.dylib             	       0x180187c60 _dispatch_main_queue_drain + 1272
17  libdispatch.dylib             	       0x180187758 _dispatch_main_queue_callback_4CF + 40
18  CoreFoundation                	       0x18041ae3c __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
19  CoreFoundation                	       0x180415534 __CFRunLoopRun + 1944
20  CoreFoundation                	       0x180414960 CFRunLoopRunSpecific + 536
21  GraphicsServices              	       0x190183b10 GSEventRunModal + 160
22  UIKitCore                     	       0x185aa2b40 -[UIApplication _run] + 796
23  UIKitCore                     	       0x185aa6d38 UIApplicationMain + 124
24  PreviewShell                  	       0x1048cee60 0x104898000 + 224864
25  dyld_sim                      	       0x105041410 start_sim + 20
26  dyld                          	       0x104b560e0 start + 2360

Thread 1:
0   libsystem_pthread.dylib       	       0x104aa65cc start_wqthread + 0

Thread 2:
0   libsystem_pthread.dylib       	       0x104aa65cc start_wqthread + 0

Thread 3:
0   libsystem_pthread.dylib       	       0x104aa65cc start_wqthread + 0

Thread 4:: com.apple.uikit.eventfetch-thread
0   libsystem_kernel.dylib        	       0x104981570 mach_msg2_trap + 8
1   libsystem_kernel.dylib        	       0x104992b80 mach_msg2_internal + 76
2   libsystem_kernel.dylib        	       0x104989798 mach_msg_overwrite + 532
3   libsystem_kernel.dylib        	       0x1049818e8 mach_msg + 20
4   CoreFoundation                	       0x18041ab60 __CFRunLoopServiceMachPort + 156
5   CoreFoundation                	       0x180415224 __CFRunLoopRun + 1160
6   CoreFoundation                	       0x180414960 CFRunLoopRunSpecific + 536
7   Foundation                    	       0x180f2af24 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 208
8   Foundation                    	       0x180f2b144 -[NSRunLoop(NSRunLoop) runUntilDate:] + 60
9   UIKitCore                     	       0x185b4ec88 -[UIEventFetcher threadMain] + 404
10  Foundation                    	       0x180f51d6c __NSThread__start__ + 720
11  libsystem_pthread.dylib       	       0x104aab414 _pthread_start + 104
12  libsystem_pthread.dylib       	       0x104aa65e0 thread_start + 8

Thread 5:
0   libsystem_pthread.dylib       	       0x104aa65cc start_wqthread + 0

Thread 6:
0   libsystem_pthread.dylib       	       0x104aa65cc start_wqthread + 0

Thread 7:
0   libsystem_pthread.dylib       	       0x104aa65cc start_wqthread + 0

Thread 8:
0   libsystem_pthread.dylib       	       0x104aa65cc start_wqthread + 0

Thread 9:
0   libsystem_pthread.dylib       	       0x104aa65cc start_wqthread + 0

Thread 10:
0   libsystem_pthread.dylib       	       0x104aa65cc start_wqthread + 0

Thread 11::  Dispatch queue: jit.execution.queue
0   libsystem_kernel.dylib        	       0x104984a70 __psynch_cvwait + 8
1   libsystem_pthread.dylib       	       0x104aab9cc _pthread_cond_wait + 1216
2   libc++.1.dylib                	       0x18030329c std::__1::condition_variable::wait(std::__1::unique_lock&) + 24
3   libc++.1.dylib                	       0x18030395c std::__1::__assoc_sub_state::__sub_wait(std::__1::unique_lock&) + 52
4   XOJIT                         	       0x240792c98 std::__1::__assoc_state::move() + 60
5   XOJIT                         	       0x2407929f8 llvm::orc::ExecutorProcessControl::callWrapper(llvm::orc::ExecutorAddr, llvm::ArrayRef) + 240
6   XOJIT                         	       0x24079144c xojit::XOJIT::runProgramOnMainThread(llvm::StringRef, llvm::StringRef, llvm::ArrayRef) + 732
7   XOJIT                         	       0x240793394 XOJIT_XOJIT_RunAsMain + 264
8   XOJIT                         	       0x2407807b4 0x24077e000 + 10164
9   XOJIT                         	       0x2407805d0 0x24077e000 + 9680
10  PreviewShellKit               	       0x22f56e894 0x22f51b000 + 342164
11  PreviewShellKit               	       0x22f578b10 0x22f51b000 + 383760
12  PreviewsFoundationOS          	       0x22f619310 0x22f5d0000 + 299792
13  PreviewsFoundationOS          	       0x22f6018d0 0x22f5d0000 + 202960
14  libdispatch.dylib             	       0x1801774ec _dispatch_call_block_and_release + 24
15  libdispatch.dylib             	       0x180178de0 _dispatch_client_callout + 16
16  libdispatch.dylib             	       0x180180f60 _dispatch_lane_serial_drain + 956
17  libdispatch.dylib             	       0x180181a98 _dispatch_lane_invoke + 388
18  libdispatch.dylib             	       0x18018cf44 _dispatch_root_queue_drain_deferred_wlh + 276
19  libdispatch.dylib             	       0x18018c5a0 _dispatch_workloop_worker_thread + 440
20  libsystem_pthread.dylib       	       0x104aa7814 _pthread_wqthread + 284
21  libsystem_pthread.dylib       	       0x104aa65d4 start_wqthread + 8

Thread 12:
0   libsystem_pthread.dylib       	       0x104aa65cc start_wqthread + 0

Thread 13:
0   libsystem_pthread.dylib       	       0x104aa65cc start_wqthread + 0

Thread 14:
0   libsystem_pthread.dylib       	       0x104aa65cc start_wqthread + 0

Thread 15:
0   libsystem_pthread.dylib       	       0x104aa65cc start_wqthread + 0

Thread 16:
0   libsystem_pthread.dylib       	       0x104aa65cc start_wqthread + 0

Thread 17:
0   libsystem_pthread.dylib       	       0x104aa65cc start_wqthread + 0

Thread 18:
0   libsystem_pthread.dylib       	       0x104aa65cc start_wqthread + 0

Thread 19:
0   libsystem_pthread.dylib       	       0x104aa65cc start_wqthread + 0


Thread 0 crashed with ARM Thread State (64-bit):
    x0: 0x80000001d9bfd3b0   x1: 0x0000000000000000   x2: 0x0000000000000000   x3: 0x0000600000c34fc0
    x4: 0x0000000000000000   x5: 0x000000016b5632e0   x6: 0x0000000000000064   x7: 0x0000000000000000
    x8: 0x0000000000000155   x9: 0x00000000a184292d  x10: 0x0000000000000154  x11: 0x0000000000000f90
   x12: 0x00000000000007fb  x13: 0x00000000000007fd  x14: 0x00000000a1a43054  x15: 0x00000000a184292d
   x16: 0x00000000a1a00000  x17: 0x0000000000000054  x18: 0x0000000000000000  x19: 0x00000001d9bf88b0
   x20: 0x80000001d9bfd3b0  x21: 0x0000000000000002  x22: 0x000000000000000b  x23: 0x0000000000000034
   x24: 0x00000000000000e8  x25: 0x00000001d9bfd220  x26: 0xd000000000000019  x27: 0x0000000000000000
   x28: 0x000000016b563460   fp: 0x000000016b563440   lr: 0x00000001947677b0
    sp: 0x000000016b563370   pc: 0x00000001947677b0 cpsr: 0x60001000
   far: 0x0000000000000000  esr: 0xf2000001 (Breakpoint) brk 1

Binary Images:
       0x104b50000 -        0x104bdbfff dyld (*) <37bbc384-0755-31c7-a808-0ed49e44dd8e> /usr/lib/dyld
       0x104898000 -        0x1048f3fff com.apple.PreviewShell (16.0) <75865c8d-54c7-3a66-96fd-fe7e566db705> /Volumes/VOLUME/*/PreviewShell.app/PreviewShell
       0x105040000 -        0x105083fff dyld_sim (*) <6499b476-4b66-3148-b85b-496aa7ea0690> /Volumes/VOLUME/*/dyld_sim
       0x1049ec000 -        0x1049f3fff libsystem_platform.dylib (*) <b7159952-fab4-38ce-a131-446d54c54afc> /usr/lib/system/libsystem_platform.dylib
       0x104980000 -        0x1049bbfff libsystem_kernel.dylib (*) <0c657561-0a7d-344e-838f-109a718679cf> /usr/lib/system/libsystem_kernel.dylib
       0x104aa4000 -        0x104ab3fff libsystem_pthread.dylib (*) <f0346f94-d1b1-311f-9ac1-aa8107c597ad> /usr/lib/system/libsystem_pthread.dylib
       0x104c78000 -        0x104c83fff libobjc-trampolines.dylib (*) <5456a55f-46e1-386f-a22e-35e385923f2d> /Volumes/VOLUME/*/libobjc-trampolines.dylib
       0x104cb0000 -        0x104cc7fff com.apple.CoreSimulator.SimFramebuffer (987) <41e1dc09-7ecb-375e-815d-4e86f1a24f79> /Library/Developer/PrivateFrameworks/CoreSimulator.framework/Versions/A/Resources/Platforms/iphoneos/Library/PrivateFrameworks/SimFramebuffer.framework/SimFramebuffer
       0x194739000 -        0x194bdffff libswiftCore.dylib (*) <011c8243-6c15-332e-a506-8f279a3a5ac6> /Volumes/VOLUME/*/libswiftCore.dylib
       0x1d9a57000 -        0x1d9c31fff com.apple.chronokit (1.0) <983ae414-b460-339e-8c20-eda0d29c7a1c> /Volumes/VOLUME/*/ChronoKit.framework/ChronoKit
       0x1d58ce000 -        0x1d58f1ff8 com.apple.chrono.WidgetPreviewsShellPlugin (1.0) <3720e1aa-b90d-341b-9363-ca41dad7be58> /Volumes/VOLUME/*/WidgetPreviewsShellPlugin.bundle/WidgetPreviewsShellPlugin
       0x22f5d0000 -        0x22f72ffff com.apple.dt.PreviewsFoundationOS (16.0) <f710b318-39da-3c42-ad67-12e29da31eb9> /Volumes/VOLUME/*/PreviewsFoundationOS.framework/PreviewsFoundationOS
       0x180175000 -        0x1801b9fff libdispatch.dylib (*) <71b0ee55-14d3-363f-88de-27caee135593> /Volumes/VOLUME/*/libdispatch.dylib
       0x18038b000 -        0x18075afff com.apple.CoreFoundation (6.9) <5f40c0e3-6b50-30c6-a686-3ab03c9a5404> /Volumes/VOLUME/*/CoreFoundation.framework/CoreFoundation
       0x190180000 -        0x190188fff com.apple.GraphicsServices (1.0) <587e9fae-3ada-346c-a206-e2949d400fff> /Volumes/VOLUME/*/GraphicsServices.framework/GraphicsServices
       0x184c81000 -        0x186976fff com.apple.UIKitCore (1.0) <d41f23e0-fb5e-33e4-9687-bb277a61190f> /Volumes/VOLUME/*/UIKitCore.framework/UIKitCore
               0x0 - 0xffffffffffffffff ??? (*) <00000000-0000-0000-0000-000000000000> ???
       0x1807da000 -        0x181420fff com.apple.Foundation (6.9) <1a4bc02e-f4dc-3ab5-9bb7-61d28064ffe8> /Volumes/VOLUME/*/Foundation.framework/Foundation
       0x1802e3000 -        0x180365ff3 libc++.1.dylib (*) <c996ec67-9783-3d31-85ad-67b6bda4349c> /Volumes/VOLUME/*/libc++.1.dylib
       0x24077e000 -        0x24124affd com.apple.xojit.XOJIT (1.0) <55a3232e-8a3a-359b-a5bb-03c55ed6ad36> /Volumes/VOLUME/*/XOJIT.framework/XOJIT
       0x22f51b000 -        0x22f5cffff com.apple.dt.PreviewShellKit (16.0) <9cb379b7-7d4e-39d2-9289-b2d62a7d5c08> /Volumes/VOLUME/*/PreviewShellKit.framework/PreviewShellKit

EOF

-----------
Full Report
-----------

{"app_name":"PreviewShell","timestamp":"2024-10-18 13:33:21.00 -0400","app_version":"16.0","slice_uuid":"75865c8d-54c7-3a66-96fd-fe7e566db705","build_version":"22.0.73","platform":7,"bundleID":"com.apple.PreviewShell","share_with_app_devs":1,"is_first_party":0,"bug_type":"309","os_version":"macOS 14.5 (23F79)","roots_installed":0,"name":"PreviewShell","incident_id":"5751EB73-82FA-4EFC-9177-FAD3D354B63E"}
{
  "uptime" : 710000,
  "procRole" : "Background",
  "version" : 2,
  "userID" : 503,
  "deployVersion" : 210,
  "modelCode" : "MacBookPro18,2",
  "coalitionID" : 59813,
  "osVersion" : {
    "train" : "macOS 14.5",
    "build" : "23F79",
    "releaseType" : "User"
  },
  "captureTime" : "2024-10-18 13:33:20.9856 -0400",
  "codeSigningMonitor" : 1,
  "incident" : "5751EB73-82FA-4EFC-9177-FAD3D354B63E",
  "pid" : 2986,
  "translated" : false,
  "cpuType" : "ARM-64",
  "roots_installed" : 0,
  "bug_type" : "309",
  "procLaunch" : "2024-10-18 13:33:18.9412 -0400",
  "procStartAbsTime" : 17059924770741,
  "procExitAbsTime" : 17059973533017,
  "procName" : "PreviewShell",
  "procPath" : "\/Volumes\/VOLUME\/*\/PreviewShell.app\/PreviewShell",
  "bundleInfo" : {"CFBundleShortVersionString":"16.0","CFBundleVersion":"22.0.73","CFBundleIdentifier":"com.apple.PreviewShell"},
  "storeInfo" : {"deviceIdentifierForVendor":"985B5DB7-9807-5465-802E-22E7AC7E003A","thirdParty":true},
  "parentProc" : "launchd_sim",
  "parentPid" : 6198,
  "coalitionName" : "com.apple.CoreSimulator.SimDevice.6041CD63-61AC-49A7-8E95-7501E1840C2F",
  "crashReporterKey" : "004B4B93-198E-57CA-190B-8A014FEEE541",
  "responsiblePid" : 2932,
  "responsibleProc" : "SimulatorTrampoline",
  "codeSigningID" : "com.apple.PreviewShell",
  "codeSigningTeamID" : "",
  "codeSigningFlags" : 570442241,
  "codeSigningValidationCategory" : 1,
  "codeSigningTrustLevel" : 4294967295,
  "instructionByteStream" : {"beforePC":"+wMAueIDGarjAxeq5AMVquUDE6rmAxaq5wMYqjYDAJTgAxSq0mYMlA==","atPC":"IAAg1IgSgFL\/EwC56AcA+UgAgFLoAwA5oCEA8ABQE5GjIQDwY8AfkQ=="},
  "wakeTime" : 494,
  "sleepWakeUUID" : "94CF1B29-711C-4824-A43B-4FB87F47C8FD",
  "sip" : "enabled",
  "exception" : {"codes":"0x0000000000000001, 0x00000001947677b0","rawCodes":[1,6785759152],"type":"EXC_BREAKPOINT","signal":"SIGTRAP"},
  "termination" : {"flags":0,"code":5,"namespace":"SIGNAL","indicator":"Trace\/BPT trap: 5","byProc":"exc handler","byPid":2986},
  "os_fault" : {"process":"PreviewShell"},
  "extMods" : {"caller":{"thread_create":0,"thread_set_state":0,"task_for_pid":0},"system":{"thread_create":0,"thread_set_state":1920,"task_for_pid":58},"targeted":{"thread_create":0,"thread_set_state":0,"task_for_pid":0},"warnings":0},
  "faultingThread" : 0,
  "threads" : [{"triggered":true,"id":86194219,"threadState":{"x":[{"value":9223372044802970544},{"value":0},{"value":0},{"value":105553129066432},{"value":0},{"value":6095778528},{"value":100},{"value":0},{"value":341},{"value":2709793069},{"value":340},{"value":3984},{"value":2043},{"value":2045},{"value":2711892052},{"value":2709793069},{"value":2711617536},{"value":84},{"value":0},{"value":7948175536},{"value":9223372044802970544},{"value":2},{"value":11},{"value":52},{"value":232},{"value":7948194336},{"value":14987979559889010713},{"value":0},{"value":6095778912}],"flavor":"ARM_THREAD_STATE64","lr":{"value":6785759152},"cpsr":{"value":1610616832},"fp":{"value":6095778880},"sp":{"value":6095778672},"esr":{"value":4060086273,"description":"(Breakpoint) brk 1"},"pc":{"value":6785759152,"matchesCrashFrame":1},"far":{"value":0}},"queue":"com.apple.main-thread","frames":[{"imageOffset":190384,"symbol":"_assertionFailure(_:_:file:line:flags:)","symbolLocation":244,"imageIndex":8},{"imageOffset":1286668,"imageIndex":9},{"imageOffset":1279992,"imageIndex":9},{"imageOffset":1278936,"imageIndex":9},{"imageOffset":90092,"imageIndex":10},{"imageOffset":86392,"imageIndex":10},{"imageOffset":100628,"imageIndex":10},{"imageOffset":779300,"imageIndex":11},{"imageOffset":100928,"imageIndex":11},{"imageOffset":779252,"imageIndex":11},{"imageOffset":773360,"imageIndex":11},{"imageOffset":773088,"imageIndex":11},{"imageOffset":777372,"imageIndex":11},{"imageOffset":202960,"imageIndex":11},{"imageOffset":9452,"symbol":"_dispatch_call_block_and_release","symbolLocation":24,"imageIndex":12},{"imageOffset":15840,"symbol":"_dispatch_client_callout","symbolLocation":16,"imageIndex":12},{"imageOffset":76896,"symbol":"_dispatch_main_queue_drain","symbolLocation":1272,"imageIndex":12},{"imageOffset":75608,"symbol":"_dispatch_main_queue_callback_4CF","symbolLocation":40,"imageIndex":12},{"imageOffset":589372,"symbol":"__CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__","symbolLocation":12,"imageIndex":13},{"imageOffset":566580,"symbol":"__CFRunLoopRun","symbolLocation":1944,"imageIndex":13},{"imageOffset":563552,"symbol":"CFRunLoopRunSpecific","symbolLocation":536,"imageIndex":13},{"imageOffset":15120,"symbol":"GSEventRunModal","symbolLocation":160,"imageIndex":14},{"imageOffset":14818112,"symbol":"-[UIApplication 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Update: In the console I get an error that looks like this:

Failed to return view entry from archive for view model with tag jindo-compactTrailing with error: SwiftUI.AnyCodable<SwiftUI.(unknown context at $1d30c3df8).SafelyCodableRequirement>.(unknown context at $1d30caf74).Errors.noType(mangledName: "7SwiftUI18TimeDataFormattingO10ResolvableVy_AA0cD6SourceVAAE15DurationStorageOys0H0V_G23[...]27CompactCountdownFormatStyleVG")

Which I believe either suggests there's some internal requirement my formatter doesn't know about or SwiftUI checks that formatters are of a specific type.

Having the same issue and I have just posted about it. Did you find any solution? Any missing requirement you've found?

Using a custom DiscreteFormatStyle in Live Activities
 
 
Q