realm-swift
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Published
20 hours ago •
realm
realm
SwiftUI: unmanaged objects and `@StateObject`/`@ObservedObject`
How frequently does the bug occur?
All the time
Description
When annotating a Realm object as @StateObject or @ObservedObject, a crash happens if this object is unmanaged. If the object is not in any Realm, it would be great to still have the observation working like any other object in SwiftUI…
Stacktrace & log output
2022-05-24 10:54:02.383660+0200 Mail[77647:14805187] *** Terminating app due to uncaught exception 'RLMException', reason: 'Only objects which are managed by a Realm support change notifications'
*** First throw call stack:
(
0 CoreFoundation 0x000000010e5f1604 __exceptionPreprocess + 242
1 libobjc.A.dylib 0x000000010d1fca45 objc_exception_throw + 48
2 MailCore 0x000000011433aee4 RLMObjectBaseAddNotificationBlock + 196
3 MailCore 0x000000011456d467 $sSo13RLMObjectBaseC10RealmSwiftE8_observe8keyPaths2on_So20RLMNotificationTokenCSaySSGSg_So17OS_dispatch_queueCSgyAC12ObjectChangeOyxGctABRbzlF + 439
4 MailCore 0x00000001145874a0 $sSo13RLMObjectBaseC10RealmSwiftE8_observeySo20RLMNotificationTokenCSaySSGSg_xt7Combine10SubscriberRzs5NeverO7FailureRtzyt5InputRtzlF + 240
5 MailCore 0x0000000114587650 $sSo13RLMObjectBaseC10RealmSwift0C12SubscribableA2cDP8_observeySo20RLMNotificationTokenCSaySSGSg_qd__t7Combine10SubscriberRd__s5NeverO7FailureRtd__yt5InputRtd__lFTW + 16
6 MailCore 0x000000011458e0c0 $s10RealmSwift0A10PublishersO10WillChangeV7receive10subscriberyqd___t7Combine10SubscriberRd__s5NeverO7FailureRtd__yt5InputRtd__lF + 192
7 MailCore 0x000000011458e44b $s10RealmSwift0A10PublishersO10WillChangeVy_xG7Combine9PublisherAagHP7receive10subscriberyqd___tAG10SubscriberRd__7FailureQyd__AMRtz5InputQyd__6OutputRtzlFTW + 27
8 SwiftUI 0x00000001211c6e0a $s7SwiftUI20SubscriptionLifetimeC9subscribe10subscriber2toyqd___xt7Combine11CancellableRd__AG10SubscriberRd__7FailureAgIPQyd__AJRtz5InputAKQyd__6OutputRtzlF + 1095
9 SwiftUI 0x00000001210b2710 $s7SwiftUI25ObservedObjectPropertyBox33_0B8DF51E8EF5CE25E70FFDB20F490665LLV6update8property5phaseSbAA0cD0VyxGz_AA12_GraphInputsV5PhaseVtF + 247
10 SwiftUI 0x0000000121422a00 $s7SwiftUI9BoxVTable33_68550FF604D39F05971FE35A26EE75B0LLC6update3ptr8property5phaseSbSv_SvAA12_GraphInputsV5PhaseVtFZ + 207
11 SwiftUI 0x0000000121421e8c $s7SwiftUI22_DynamicPropertyBufferV6update9container5phaseSbSv_AA12_GraphInputsV5PhaseVtF + 68
12 SwiftUI 0x0000000120e57312 $s7SwiftUI11StateObjectV3Box33_26399901AD247149EF526863F9AAF7C4LLV6update8property5phaseSbACyxGz_AA12_GraphInputsV5PhaseVtF + 181
13 SwiftUI 0x0000000121422a00 $s7SwiftUI9BoxVTable33_68550FF604D39F05971FE35A26EE75B0LLC6update3ptr8property5phaseSbSv_SvAA12_GraphInputsV5PhaseVtFZ + 207
14 SwiftUI 0x0000000121421e8c $s7SwiftUI22_DynamicPropertyBufferV6update9container5phaseSbSv_AA12_GraphInputsV5PhaseVtF + 68
15 SwiftUI 0x00000001210fbfb6 $s7SwiftUI11DynamicBody33_49D2A32E637CD497C6DE29B8E060A506LLV11updateValueyyF + 336
16 SwiftUI 0x00000001212f623d $s14AttributeGraph0A0VyACyxGqd__c5ValueQyd__RszAA12StatefulRuleRd__lufcADSPyqd__GXEfU_ySv_So11AGAttributeatcyXEfU_ySv_AJtcqd__mcfu_ySv_AJtcfu0_TA + 26
17 AttributeGraph 0x0000000145bb57cd _ZN2AG5Graph11UpdateStack6updateEv + 559
18 AttributeGraph 0x0000000145bb5dc3 _ZN2AG5Graph16update_attributeENS_4data3ptrINS_4NodeEEEj + 411
19 AttributeGraph 0x0000000145bbc193 _ZN2AG5Graph20input_value_ref_slowENS_4data3ptrINS_4NodeEEENS_11AttributeIDEjPK15AGSwiftMetadataRhl + 553
20 AttributeGraph 0x0000000145bd27f0 AGGraphGetValue + 213
21 SwiftUI 0x00000001210fbaf6 $s7SwiftUI10StaticBody33_49D2A32E637CD497C6DE29B8E060A506LLV9container9ContainerQzvg + 102
22 SwiftUI 0x00000001210fbbba $s7SwiftUI10StaticBody33_49D2A32E637CD497C6DE29B8E060A506LLV11updateValueyyF + 142
23 SwiftUI 0x00000001212f623d $s14AttributeGraph0A0VyACyxGqd__c5ValueQyd__RszAA12StatefulRuleRd__lufcADSPyqd__GXEfU_ySv_So11AGAttributeatcyXEfU_ySv_AJtcqd__mcfu_ySv_AJtcfu0_TA + 26
24 AttributeGraph 0x0000000145bb57cd _ZN2AG5Graph11UpdateStack6updateEv + 559
25 AttributeGraph 0x0000000145bb5dc3 _ZN2AG5Graph16update_attributeENS_4data3ptrINS_4NodeEEEj + 411
26 AttributeGraph 0x0000000145bbc193 _ZN2AG5Graph20input_value_ref_slowENS_4data3ptrINS_4NodeEEENS_11AttributeIDEjPK15AGSwiftMetadataRhl + 553
27 AttributeGraph 0x0000000145bd27f0 AGGraphGetValue + 213
28 SwiftUI 0x000000012150c9b0 $s7SwiftUI19_ConditionalContentVA2A4ViewRzAaDR_rlE05ChildE033_1A625ACC143FD8524C590782FD8F4F8CLLV7contentACyxq_Gvg + 59
29 SwiftUI 0x000000012150cadd $s7SwiftUI19_ConditionalContentVA2A4ViewRzAaDR_rlE05ChildE033_1A625ACC143FD8524C590782FD8F4F8CLLV5valueAA03AnyE0Vvg + 274
30 SwiftUI 0x000000012150cbe1 $s7SwiftUI19_ConditionalContentVA2A4ViewRzAaDR_rlE05ChildE033_1A625ACC143FD8524C590782FD8F4F8CLLVyxq__G14AttributeGraph4RuleAaiJP5value5ValueQzvgTW + 48
31 AttributeGraph 0x0000000145bd5d67 $s14AttributeGraph4RuleP5value5ValueQzvgTj + 7
32 SwiftUI 0x0000000120b049de $s14AttributeGraph0A0VyACyxGqd__c5ValueQyd__RszAA4RuleRd__lufcADSPyqd__GXEfU_ySv_So11AGAttributeatcyXEfU_ySv_AJtcqd__mcfu_ySv_AJtcfu0_ + 111
33 AttributeGraph 0x0000000145bb57cd _ZN2AG5Graph11UpdateStack6updateEv + 559
34 AttributeGraph 0x0000000145bb5dc3 _ZN2AG5Graph16update_attributeENS_4data3ptrINS_4NodeEEEj + 411
35 AttributeGraph 0x0000000145bbc193 _ZN2AG5Graph20input_value_ref_slowENS_4data3ptrINS_4NodeEEENS_11AttributeIDEjPK15AGSwiftMetadataRhl + 553
36 AttributeGraph 0x0000000145bd27f0 AGGraphGetValue + 213
37 SwiftUI 0x000000012110318c $s7SwiftUI11AnyViewList33_A96961F3546506F21D8995C6092F15B5LLV11updateValueyyF + 81
38 SwiftUI 0x0000000120ab8377 $s14AttributeGraph0A0VyACyxGqd__c5ValueQyd__RszAA12StatefulRuleRd__lufcADSPyqd__GXEfU_ySv_So11AGAttributeatcyXEfU_ySv_AJtcqd__mcfu_ySv_AJtcfu0_7SwiftUI8ViewList_p_AK03AnyiJ033_A96961F3546506F21D8995C6092F15B5LLVTg5TA + 15
39 AttributeGraph 0x0000000145bb57cd _ZN2AG5Graph11UpdateStack6updateEv + 559
40 AttributeGraph 0x0000000145bb5dc3 _ZN2AG5Graph16update_attributeENS_4data3ptrINS_4NodeEEEj + 411
41 AttributeGraph 0x0000000145bbc193 _ZN2AG5Graph20input_value_ref_slowENS_4data3ptrINS_4NodeEEENS_11AttributeIDEjPK15AGSwiftMetadataRhl + 553
42 AttributeGraph 0x0000000145bd27f0 AGGraphGetValue + 213
43 SwiftUI 0x0000000120a60347 $s14AttributeGraph0A0VyACyxGqd__c5ValueQyd__RszAA4RuleRd__lufcADSPyqd__GXEfU_ySv_So11AGAttributeatcyXEfU_ySv_AJtcqd__mcfu_ySv_AJtcfu0_7SwiftUI8ViewList_p_AK01_hI7OutputsV14ApplyModifiers33_70E71091E926A1B09B75AAEB38F5AA3FLLVTg5 + 97
44 AttributeGraph 0x0000000145bb57cd _ZN2AG5Graph11UpdateStack6updateEv + 559
45 AttributeGraph 0x0000000145bb5dc3 _ZN2AG5Graph16update_attributeENS_4data3ptrINS_4NodeEEEj + 411
46 AttributeGraph 0x0000000145bbc193 _ZN2AG5Graph20input_value_ref_slowENS_4data3ptrINS_4NodeEEENS_11AttributeIDEjPK15AGSwiftMetadataRhl + 553
47 AttributeGraph 0x0000000145bd27f0 AGGraphGetValue + 213
48 SwiftUI 0x0000000121103939 $s7SwiftUI11AnyViewList33_A96961F3546506F21D8995C6092F15B5LLV4ItemC4listAA0dE0_pvg + 99
49 SwiftUI 0x000000012110332d $s7SwiftUI11AnyViewList33_A96961F3546506F21D8995C6092F15B5LLV11updateValueyyF + 498
50 SwiftUI 0x0000000120ab8377 $s14AttributeGraph0A0VyACyxGqd__c5ValueQyd__RszAA12StatefulRuleRd__lufcADSPyqd__GXEfU_ySv_So11AGAttributeatcyXEfU_ySv_AJtcqd__mcfu_ySv_AJtcfu0_7SwiftUI8ViewList_p_AK03AnyiJ033_A96961F3546506F21D8995C6092F15B5LLVTg5TA + 15
51 AttributeGraph 0x0000000145bb57cd _ZN2AG5Graph11UpdateStack6updateEv + 559
52 AttributeGraph 0x0000000145bb5dc3 _ZN2AG5Graph16update_attributeENS_4data3ptrINS_4NodeEEEj + 411
53 AttributeGraph 0x0000000145bbc193 _ZN2AG5Graph20input_value_ref_slowENS_4data3ptrINS_4NodeEEENS_11AttributeIDEjPK15AGSwiftMetadataRhl + 553
54 AttributeGraph 0x0000000145bd27f0 AGGraphGetValue + 213
55 SwiftUI 0x0000000121103939 $s7SwiftUI11AnyViewList33_A96961F3546506F21D8995C6092F15B5LLV4ItemC4listAA0dE0_pvg + 99
56 SwiftUI 0x000000012110332d $s7SwiftUI11AnyViewList33_A96961F3546506F21D8995C6092F15B5LLV11updateValueyyF + 498
57 SwiftUI 0x0000000120ab8377 $s14AttributeGraph0A0VyACyxGqd__c5ValueQyd__RszAA12StatefulRuleRd__lufcADSPyqd__GXEfU_ySv_So11AGAttributeatcyXEfU_ySv_AJtcqd__mcfu_ySv_AJtcfu0_7SwiftUI8ViewList_p_AK03AnyiJ033_A96961F3546506F21D8995C6092F15B5LLVTg5TA + 15
58 AttributeGraph 0x0000000145bb57cd _ZN2AG5Graph11UpdateStack6updateEv + 559
59 AttributeGraph 0x0000000145bb5dc3 _ZN2AG5Graph16update_attributeENS_4data3ptrINS_4NodeEEEj + 411
60 AttributeGraph 0x0000000145bbc193 _ZN2AG5Graph20input_value_ref_slowENS_4data3ptrINS_4NodeEEENS_11AttributeIDEjPK15AGSwiftMetadataRhl + 553
61 AttributeGraph 0x0000000145bd27f0 AGGraphGetValue + 213
62 SwiftUI 0x0000000121103939 $s7SwiftUI11AnyViewList33_A96961F3546506F21D8995C6092F15B5LLV4ItemC4listAA0dE0_pvg + 99
63 SwiftUI 0x000000012110332d $s7SwiftUI11AnyViewList33_A96961F3546506F21D8995C6092F15B5LLV11updateValueyyF + 498
64 SwiftUI 0x0000000120ab8377 $s14AttributeGraph0A0VyACyxGqd__c5ValueQyd__RszAA12StatefulRuleRd__lufcADSPyqd__GXEfU_ySv_So11AGAttributeatcyXEfU_ySv_AJtcqd__mcfu_ySv_AJtcfu0_7SwiftUI8ViewList_p_AK03AnyiJ033_A96961F3546506F21D8995C6092F15B5LLVTg5TA + 15
65 AttributeGraph 0x0000000145bb57cd _ZN2AG5Graph11UpdateStack6updateEv + 559
66 AttributeGraph 0x0000000145bb5dc3 _ZN2AG5Graph16update_attributeENS_4data3ptrINS_4NodeEEEj + 411
67 AttributeGraph 0x0000000145bbc193 _ZN2AG5Graph20input_value_ref_slowENS_4data3ptrINS_4NodeEEENS_11AttributeIDEjPK15AGSwiftMetadataRhl + 553
68 AttributeGraph 0x0000000145bd27f0 AGGraphGetValue + 213
69 SwiftUI 0x0000000120e23b72 $s7SwiftUI24DynamicLayoutViewAdaptor33_8B9C7F39264416187A895085215951BCLLV12updatedItemsAA0E4List_pSgyF + 81
70 SwiftUI 0x0000000120968af9 $s7SwiftUI20DynamicContainerInfoV11updateItems33_023AA827B8A8D39774F7A0C281455FEELL18disableTransitionsSb7changed_Sb8hasDepthtSb_tFAA0C17LayoutViewAdaptor33_8B9C7F39264416187A895085215951BCLLV_Tg5 + 53
71 SwiftUI 0x0000000120967142 $s7SwiftUI20DynamicContainerInfoV11updateValueyyFAA0C17LayoutViewAdaptor33_8B9C7F39264416187A895085215951BCLLV_Tg5 + 556
72 SwiftUI 0x0000000120a86b47 $s14AttributeGraph0A0VyACyxGqd__c5ValueQyd__RszAA12StatefulRuleRd__lufcADSPyqd__GXEfU_ySv_So11AGAttributeatcyXEfU_ySv_AJtcqd__mcfu_ySv_AJtcfu0_7SwiftUI16DynamicContainerV4InfoV_AK0ijK0VyAK0I17LayoutViewAdaptor33_8B9C7F39264416187A895085215951BCLLVGTg5TA + 15
73 AttributeGraph 0x0000000145bb57cd _ZN2AG5Graph11UpdateStack6updateEv + 559
74 AttributeGraph 0x0000000145bb5dc3 _ZN2AG5Graph16update_attributeENS_4data3ptrINS_4NodeEEEj + 411
75 AttributeGraph 0x0000000145bbc193 _ZN2AG5Graph20input_value_ref_slowENS_4data3ptrINS_4NodeEEENS_11AttributeIDEjPK15AGSwiftMetadataRhl + 553
76 AttributeGraph 0x0000000145bd27f0 AGGraphGetValue + 213
77 SwiftUI 0x0000000120be3887 $s7SwiftUI25DynamicPreferenceCombiner33_023AA827B8A8D39774F7A0C281455FEELLV4infoAA0C9ContainerV4InfoVSgvg + 107
78 SwiftUI 0x0000000120be3a11 $s7SwiftUI25DynamicPreferenceCombiner33_023AA827B8A8D39774F7A0C281455FEELLV5value5ValueQzvg + 132
79 SwiftUI 0x0000000120be3ee4 $s7SwiftUI25DynamicPreferenceCombiner33_023AA827B8A8D39774F7A0C281455FEELLVyxG14AttributeGraph4RuleAafGP5value5ValueQzvgTW + 23
80 AttributeGraph 0x0000000145bd5d67 $s14AttributeGraph4RuleP5value5ValueQzvgTj + 7
81 SwiftUI 0x0000000120b049de $s14AttributeGraph0A0VyACyxGqd__c5ValueQyd__RszAA4RuleRd__lufcADSPyqd__GXEfU_ySv_So11AGAttributeatcyXEfU_ySv_AJtcqd__mcfu_ySv_AJtcfu0_ + 111
82 AttributeGraph 0x0000000145bb57cd _ZN2AG5Graph11UpdateStack6updateEv + 559
83 AttributeGraph 0x0000000145bb5dc3 _ZN2AG5Graph16update_attributeENS_4data3ptrINS_4NodeEEEj + 411
84 AttributeGraph 0x0000000145bbbad8 _ZN2AG5Graph9value_refENS_11AttributeIDEPK15AGSwiftMetadataRh + 128
85 AttributeGraph 0x0000000145bd2841 AGGraphGetValue + 294
86 SwiftUI 0x0000000121417bba $s7SwiftUI9GraphHostC17updatePreferencesSbyF + 84
87 SwiftUI 0x0000000120d4e54e $s7SwiftUI9ViewGraphC13updateOutputs33_D63C4EB7F2B205694B6515509E76E98BLLyyF + 316
88 SwiftUI 0x000000012131fe6e $s7SwiftUI16ViewRendererHostPAAE6render8interval17updateDisplayListySd_SbtFyyXEfU_ + 2013
89 SwiftUI 0x0000000121316655 $s7SwiftUI16ViewRendererHostPAAE6render8interval17updateDisplayListySd_SbtF + 360
90 SwiftUI 0x000000012157a012 $s7SwiftUI14_UIHostingViewC14layoutSubviewsyyF + 286
91 SwiftUI 0x000000012157a06c $s7SwiftUI14_UIHostingViewC14layoutSubviewsyyFTo + 21
92 UIKitCore 0x000000011c929184 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 2496
93 QuartzCore 0x000000011b3fc431 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 543
94 UIKitCore 0x000000011c9146ce -[UIView(Hierarchy) layoutBelowIfNeeded] + 1505
95 UIKitCore 0x000000011c64a878 -[UISheetPresentationController _sheetLayoutInfoLayout:] + 48
96 UIKitCore 0x000000011ba7ae80 -[_UISheetLayoutInfo _layout] + 371
97 UIKitCore 0x000000011c64c51d __54-[UISheetPresentationController _transitionWillBegin:]_block_invoke_2 + 52
98 UIKitCore 0x000000011c91b8af +[UIView(Animation) performWithoutAnimation:] + 84
99 UIKitCore 0x000000011c64c444 __54-[UISheetPresentationController _transitionWillBegin:]_block_invoke.523 + 132
100 UIKitCore 0x000000011bbc870e -[_UIViewControllerTransitionCoordinator _applyBlocks:releaseBlocks:] + 297
101 UIKitCore 0x000000011bbc4c6b -[_UIViewControllerTransitionContext __runAlongsideAnimations] + 278
102 UIKitCore 0x000000011c91b6d2 __63+[UIView(Animation) _setAlongsideAnimations:toRunByEndOfBlock:]_block_invoke + 16
103 UIKitCore 0x000000011c8ec731 -[UIViewAnimationState _runAlongsideAnimations] + 24
104 UIKitCore 0x000000011c8eb47e -[UIViewAnimationState pop] + 37
105 UIKitCore 0x000000011c8e8873 +[UIViewAnimationState popAnimationState] + 62
106 UIKitCore 0x000000011c91d408 +[UIView _setupAnimationWithDuration:delay:view:options:factory:animations:start:animationStateGenerator:completion:] + 887
107 UIKitCore 0x000000011c91d680 +[UIView(UIViewAnimationWithBlocks) animateWithDuration:delay:options:animations:completion:] + 25
108 UIKitCore 0x000000011c8e3e44 __50-[UITransitionView _startTransition:withDuration:]_block_invoke.170 + 148
109 UIKitCore 0x000000011c91da5d +[UIView(UIViewAnimationWithBlocks) conditionallyAnimate:withAnimation:layout:completion:] + 76
110 UIKitCore 0x000000011c8e386b -[UITransitionView _startTransition:withDuration:] + 737
111 UIKitCore 0x000000011c8e33a0 -[UITransitionView transition:fromView:toView:removeFromView:] + 3027
112 UIKitCore 0x000000011bbc0445 -[UIViewControllerBuiltinTransitionViewAnimator animateTransition:] + 1253
113 UIKitCore 0x000000011bbc9258 ___UIViewControllerTransitioningRunCustomTransition_block_invoke_2 + 59
114 UIKitCore 0x000000011bd0bab5 +[UIKeyboardSceneDelegate _pinInputViewsForKeyboardSceneDelegate:onBehalfOfResponder:duringBlock:] + 99
115 UIKitCore 0x000000011bbc91e7 ___UIViewControllerTransitioningRunCustomTransition_block_invoke.641 + 180
116 UIKitCore 0x000000011c91b5e5 +[UIView(Animation) _setAlongsideAnimations:toRunByEndOfBlock:] + 175
117 UIKitCore 0x000000011bbc907e _UIViewControllerTransitioningRunCustomTransition + 580
118 UIKitCore 0x000000011ba67901 __56-[UIPresentationController runTransitionForCurrentState]_block_invoke.401 + 2422
119 UIKitCore 0x000000011c8bf1a9 -[_UIAfterCACommitBlock run] + 54
120 UIKitCore 0x000000011c8bf6a1 -[_UIAfterCACommitQueue flush] + 190
121 UIKitCore 0x000000011c36c809 _runAfterCACommitDeferredBlocks + 782
122 UIKitCore 0x000000011c35c0d9 _cleanUpAfterCAFlushAndRunDeferredBlocks + 135
123 UIKitCore 0x000000011c390612 _afterCACommitHandler + 72
124 CoreFoundation 0x000000010e55d2f1 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
125 CoreFoundation 0x000000010e557ab5 __CFRunLoopDoObservers + 570
126 CoreFoundation 0x000000010e55804d __CFRunLoopRun + 1100
127 CoreFoundation 0x000000010e557704 CFRunLoopRunSpecific + 562
128 GraphicsServices 0x0000000113620c8e GSEventRunModal + 139
129 UIKitCore 0x000000011c35d65a -[UIApplication _run] + 928
130 UIKitCore 0x000000011c3622b5 UIApplicationMain + 101
131 libswiftUIKit.dylib 0x0000000110054cc2 $s5UIKit17UIApplicationMainys5Int32VAD_SpySpys4Int8VGGSgSSSgAJtF + 98
132 Mail 0x00000001040c92f8 $sSo21UIApplicationDelegateP5UIKitE4mainyyFZ + 104
133 Mail 0x00000001040c9287 $s4Mail11AppDelegateC5$mainyyFZ + 39
134 Mail 0x00000001040c93d8 main + 24
135 dyld 0x000000010cd02f21 start_sim + 10
136 ??? 0x000000020493f51e 0x0 + 8666739998
137 ??? 0x0000000000000003 0x0 + 3
)
libc++abi: terminating with uncaught exception of type NSException
Can you reproduce the bug?
Yes, always
Reproduction Steps
- In a SwiftUI view, add a
@StateObjector@ObservedObjectvariable with Realm Object type - Assign an unmanaged object to this variable
- Observe the crash
Version
10.26.0
What SDK flavour are you using?
Local Database only
Are you using encryption?
No, not using encryption
Platform OS and version(s)
iOS 15.5
Build environment
Xcode version: 13.4 Dependency manager and version: SPM
@pavel-ship-it thanks for the answer, I didn't know about this and it fixes the crash. However, now I still get a crash when doing:
.onReceive(myObject.objectWillChange) { _ in
print("Object changed")
}
Any other way to do this with Realm?
Same crash as above: Only objects which are managed by a Realm support change notifications
The code looks like this:
struct NewMessageView: View {
@StateRealmObject var draft: Draft
init(draft: Draft? = nil) {
let draft = draft ?? Draft(messageUid: UUID().uuidString,
body: "Default body")
draft.identityId = "my_identity_id"
_draft = StateRealmObject(wrappedValue: draft)
}
var body: some View {
NavigationView {
// My view…
}
.onReceive(draft.objectWillChange) { _ in
print("ON CHANGE")
}
}
}
It looks we have a bug here, as StateRealmObject should work with unmanaged object.
Meanwhile, as a workaround, I can recommend to use managed object. If you want to separate a draft object from the saved objects you also can use a separate object type.
Hi @flowbe the issue here is that our Combine API doesn't allow observation on unmanaged objects, so if you use StateRealmObject.objectWillChange this operation is not allowed unless StateRealmObject is managed by the realm. StateRealmObject is meant to be used in a way that any changes on the object properties (unmanaged or managed), will propagate to your SwiftUI view. So a better use of this will be to have something like this
class Draft: Object {
@Persisted var messageUid: UUID
@Persisted var body: String
@Persisted var identityId: String?
init(memessageUid: UUID, body: String) {
self.messageUid = messageUid
self.body = body
}
}
struct NewMessageView: View {
@StateRealmObject var draft: Draft
init(draft: Draft? = nil) {
let draft = draft ?? Draft(messageUid: UUID().uuidString,
body: "Default body")
draft.identityId = "my_identity_id"
_draft = StateRealmObject(wrappedValue: draft)
}
var body: some View {
NavigationView {
Text("Identity: \(draft.identityId)")
TextField("Body", text: $draft.body)
}
}
}
where your elements of the SwiftUI will change if for example there are some changes in identityId or body, and the other way in case of body
Hi @dianaafanador3, thank you for the clarification. However, I needed to observe the changes using objectWillChange to perform non-UI actions…
Basically, my code looks like this:
var body: some View {
NavigationView {
TextField("", $draft.subject)
}
.onReceive(draft.objectWillChange) { _ in
saveDraft()
}
}
If you are using iOS > 15.0, you can use .onSubmit which will be called every time you return over a SwiftUI element. If not you can use
.onChange(of: draft.body, perform: { _ in
})
to observe an specific property in the object.
For now objectWillChange works only with managed objects, like when our observe API.
I'll take to the team if we want to extend this to unmanaged objects.
Thank you for the suggestion. However, this doesn't match what I want to achieve. For now, I had to create a copy of my class that is not a Realm object only to make observation work and then convert it to a Realm managed object when I need to save it. This is clearly not ideal so it would be nice if you decide to improve this in the future.