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如何访问 CNContainer 对象的 externalIdentifier?

externalIdentifier 不是 CNContainer 对象的实例属性。我将 CNContainer 对象的描述属性打印到调试窗口。我在下面用粗体显示“externalIdentifier”。

<CNContainer: 0x2829a43f0: identifier=32B14F4B-7299-4AA5-BADD-85344DB3D7B8, name=Contacts, type=3 (CardDAV), iOSLegacyIdentifier=1346, accountIdentifier=012AF8C6-A3AB-4AD6-8C91-5FB5266CC8E6, enabled=1, permissions= <CNContainerPermissions: 0x2819a21e0: canCreateContacts=NO, canDeleteContacts=NO, canCreateGroups=NO>, externalIdentifier =/dav/brenebrownfan/Contacts/, externalModificationTag=c7e1249ffc03eb9ded908c236bd1996d, externalSyncTag=(nil), externalSyncData={length = 95, bytes = 0x62706c69 73743030 d2010203 045e6d61 ... 00000000 0000003a },constraintsPath=(nil),meIdentifier=635,restrictions=0,guardianRestricted=0,lastSyncDate=2019-09-25 08:14:59 +0000>

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