我有默认Dictionary：
var activeLanguage:Dictionary<String,AnyObject> = [
"name":"English",
"tag":"en",
"change_by_user":false,
"css_path":""
]
从应用程序用户获得新配置，我的目标是验证字段并将新值存储到activeLanguage（a.e替换为新值）。如果某个键不存在，我会设置默认值。没什么复杂的。
这是我的实施：
func build(obj:AnyObject){
if let tempDict:Dictionary<String,AnyObject> = obj["activeLanguage"] as? Dictionary<String,AnyObject>{
self.activeLanguage["name"] = tempDict["name"] as? String ?? activeLanguage["name"] // <-- CRASH here
self.activeLanguage["tag"] = tempDict["tag"] as? String ?? activeLanguage["tag"]
self.activeLanguage["change_by_user"] = tempDict["change_by_user"] as? Bool ?? false
self.activeLanguage["css_path"] = tempDict["css_path"] as? String ?? activeLanguage["css_path"]
}
}
我在几个客户端上测试过但在一个应用程序上崩溃了：
self.activeLanguage["name"] = tempDict["name"] as? String ?? activeLanguage["name"]
完整堆栈跟踪：
EXC_BAD_ACCESS KERN_INVALID_ADDRESS位于0x00000001ae36bec8
Thread : Crashed: com.apple.root.default-qos
0 libswiftCore.dylib 0x00000001004a17d0 swift_unknownRelease + 24
1 MyApp 0x00000001000a4654 specialization <Swift.String with Swift.String : Swift.Hashable, Swift.AnyObject> of Swift._VariantDictionaryStorage.ensureUniqueNativeStorage <A : Swift.Hashable, B>(inout Swift._VariantDictionaryStorage<A, B>)(Swift.Int) -> (reallocated : Swift.Bool, capacityChanged : Swift.Bool) (MyAppPlugin.swift)
2 MyApp 0x00000001000a2800 specialization <Swift.String with Swift.String : Swift.Hashable, Swift.AnyObject> of Swift._VariantDictionaryStorage.nativeUpdateValue <A : Swift.Hashable, B>(inout Swift._VariantDictionaryStorage<A, B>)(B, forKey : A) -> Swift.Optional<B> (MyAppPlugin.swift)
3 MyApp 0x00000001000a1fa4 specialization <Swift.String with Swift.String : Swift.Hashable, Swift.AnyObject> of Swift.Dictionary.subscript.setter (A) -> Swift.Optional<B> (MyAppPlugin.swift)
4 MyApp 0x00000001001a93e8 MyApp.WmConfigModel.build (MyApp.WmConfigModel)(Swift.AnyObject) -> () (WmConfigModel.swift:84)
5 MyApp 0x00000001001ced54 MyApp.WmSettingsMgr.setSettings (MyApp.WmSettingsMgr.Type)(Swift.AnyObject) -> () (WmSettingsMgr.swift:29)
6 MyApp 0x000000010009cce4 MyApp.MyAppPlugin.(setSettings (MyApp.MyAppPlugin) -> (ObjectiveC.CDVInvokedUrlCommand) -> ()).(closure #1) (<imports>)
7 MyApp 0x0000000100099aa0 partial apply forwarder for reabstraction thunk helper from @callee_owned () -> (@unowned ()) to @callee_owned (@in ()) -> (@out ()) with unmangled suffix "102" (MyAppPlugin.swift:57)
8 MyApp 0x0000000100099b10 partial apply forwarder for reabstraction thunk helper from @callee_owned (@in ()) -> (@out ()) to @callee_owned () -> (@unowned ()) with unmangled suffix "105" (MyAppPlugin.swift:57)
9 libdispatch.dylib 0x00000001978213ac _dispatch_call_block_and_release + 24
10 libdispatch.dylib 0x000000019782136c _dispatch_client_callout + 16
11 libdispatch.dylib 0x000000019782d40c _dispatch_root_queue_drain + 1152
12 libdispatch.dylib 0x000000019782e75c _dispatch_worker_thread3 + 108
13 libsystem_pthread.dylib 0x00000001979fd2e4 _pthread_wqthread + 816
(WmConfigModel.swift:84)指向：
self.activeLanguage["name"] = tempDict["name"] as? String ?? activeLanguage["name"]