如何解决 myModel 变量中的 UserDefaults 设置错误?
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【中文标题】如何解决 myModel 变量中的 UserDefaults 设置错误?【英文标题】:How can I solve UserDefaults set error in my variable from myModel? 【发布时间】:2019-03-23 19:05:16 【问题描述】:我想使用 UserDefault 设置我的变量,我尝试了很多次,但每次都返回错误。
我错过了什么?
型号
import Foundation
struct MyModel: Codable
var one: String?
var two: String?
变量
var savedData: [String : MyModel]
get
return UserDefaults.standard.object(forKey: "key") as! [String : MyModel]? ?? [String : MyModel]()
set (newData)
UserDefaults.standard.set(newData, forKey: "key")
代码
self.savedData[position!] = self.myModel
我无法理解这个错误。关于这个错误,我需要了解什么?
0 CoreFoundation 0x00000001022951bb __exceptionPreprocess + 331
1 libobjc.A.dylib 0x0000000101240735 objc_exception_throw + 48
2 CoreFoundation 0x0000000102295015 +[NSException raise:format:] + 197
3 CoreFoundation 0x00000001021acdb8 _CFPrefsValidateValueForKey + 312
4 CoreFoundation 0x00000001021ad24c -[CFPrefsSource setValues:forKeys:count:copyValues:removeValuesForKeys:count:from:] + 380
5 CoreFoundation 0x00000001021ad5dc -[CFPrefsSource setValues:forKeys:count:copyValues:from:] + 28
6 CoreFoundation 0x00000001021ad633 -[CFPrefsSource setValue:forKey:from:] + 67
7 CoreFoundation 0x000000010228ba9e __108-[_CFXPreferences(SearchListAdditions) withSearchListForIdentifier:container:cloudConfigurationURL:perform:]_block_invoke + 318
8 CoreFoundation 0x000000010228b1ea normalizeQuintuplet + 314
9 CoreFoundation 0x000000010228b954 -[_CFXPreferences(SearchListAdditions) withSearchListForIdentifier:container:cloudConfigurationURL:perform:] + 100
10 CoreFoundation 0x0000000102267b4b -[_CFXPreferences setValue:forKey:appIdentifier:container:configurationURL:] + 91
11 CoreFoundation 0x000000010226bfa5 _CFPreferencesSetAppValueWithContainer + 117
12 Foundation 0x0000000100ce3ce1 -[NSUserDefaults(NSUserDefaults) setObject:forKey:] + 55
13 X 0x00000001006e6937 $S13X21ViewViewControllerC9savedDataSDySSAA12MyModelVGvs + 391
14 X 0x00000001006e6982 $S13X21ViewViewControllerC9savedDataSDySSAA12MyModelVGvmytfU_ + 18
15 X 0x00000001006f1b69 $S13X21ViewViewControllerC11getDateData4dateyAA10DateModelV_tFy10Foundation0H0VSg_So13NSURLResponseCSgs5Error_pSgtcfU_ + 2361
16 X 0x00000001006f4e26 $S13X21ViewViewControllerC11getDateData4dateyAA10DateModelV_tFy10Foundation0H0VSg_So13NSURLResponseCSgs5Error_pSgtcfU_TA + 54
17 X 0x00000001006d2dd0 $S10Foundation4DataVSgSo13NSURLResponseCSgs5Error_pSgIegggg_So6NSDataCSgAGSo7NSErrorCSgIeyByyy_TR + 336
18 CFNetwork 0x0000000103f15940 __75-[__NSURLSessionLocal taskForClass:request:uploadFile:bodyData:completion:]_block_invoke + 19
19 CFNetwork 0x0000000103f2bb0c __49-[__NSCFLocalSessionTask _task_onqueue_didFinish]_block_invoke + 172
20 Foundation 0x0000000100cadf9e __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 7
21 Foundation 0x0000000100cadea5 -[NSBlockOperation main] + 68
22 Foundation 0x0000000100caac14 -[__NSOperationInternal _start:] + 689
23 Foundation 0x0000000100cb0c4b __NSOQSchedule_f + 227
24 libdispatch.dylib 0x0000000104e52595 _dispatch_call_block_and_release + 12
25 libdispatch.dylib 0x0000000104e53602 _dispatch_client_callout + 8
26 libdispatch.dylib 0x0000000104e5654d _dispatch_continuation_pop + 565
27 libdispatch.dylib 0x0000000104e55927 _dispatch_async_redirect_invoke + 859
28 libdispatch.dylib 0x0000000104e6400a _dispatch_root_queue_drain + 351
29 libdispatch.dylib 0x0000000104e649af _dispatch_worker_thread2 + 130
30 libsystem_pthread.dylib 0x00000001052436dd _pthread_wqthread + 619
31 libsystem_pthread.dylib 0x0000000105243405 start_wqthread + 13
【问题讨论】:
【参考方案1】:仅仅采用Codable
并不能使自定义对象属性列表兼容,您必须添加例如序列化代码
var savedData: [String : MyModel]
get
guard let data = UserDefaults.standard.data(forKey: "key") else return [:]
return try? JSONDecoder().decode([String:MyModel].self, from: data) ?? [:]
set (newData)
if let data = try? JSONEncoder().encode(newData)
UserDefaults.standard.set(data, forKey: "key")
【讨论】:
非常感谢。以上是关于如何解决 myModel 变量中的 UserDefaults 设置错误?的主要内容,如果未能解决你的问题,请参考以下文章
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