iOS-尝试在NSUserDefaults中插入非属性列表对象NSDictionary [英] iOS - Attempt to insert non-property list object NSDictionary in NSUserDefaults

问题描述

在我的应用中，我需要将自定义的 User 对象 NSDictionary 保存在我的 NSUserDefaults 中.我尝试使用以下代码进行此操作:

In my app, I need to save my custom User object NSDictionary in my NSUserDefaults. I attempt this with the following code:

NSDictionary *userObjectDictionary = response[@"user"];
NSLog(@"USER OBJECT:\n%@", userObjectDictionary);
[defaults setObject:userObjectDictionary forKey:@"defaultUserObjectDictionary"];
[defaults synchronize];

此尝试使我的应用程序崩溃，并显示以下消息:

This attempt crashes my app with the following message:

由于未捕获的异常而终止应用程序"NSInvalidArgumentException"，原因:试图插入非属性清单物件{type =不变的字典，计数= 10，条目=> 0:status_id = 1:{contents ="first_name"} = exampleFirstName 3:id = {value = + 2，type =kCFNumberSInt64Type} 4:{contents ="profile_picture"} = {contents =" http://myDevServer.com/pictures/userName.jpg "} 5:last_name = exampleLastName 7:电子邮件= {contents ="[e-mail]"} 8:{contents ="badge_count"} = {值= +0，类型=kCFNumberSInt64Type} 9:user_name =用户名10:{contents ="phone_number"} = {contents ="0123456789"} 12:{contents ="status_updated_at"} =}为关键defaultUserObjectDictionary'

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Attempt to insert non-property list object {type = immutable dict, count = 10, entries => 0 : status_id = 1 : {contents = "first_name"} = exampleFirstName 3 : id = {value = +2, type = kCFNumberSInt64Type} 4 : {contents = "profile_picture"} = {contents = "http://myDevServer.com/pictures/userName.jpg"} 5 : last_name = exampleLastName 7 : email = {contents = "[e-mail]"} 8 : {contents = "badge_count"} = {value = +0, type = kCFNumberSInt64Type} 9 : user_name = userName 10 : {contents = "phone_number"} = {contents = "0123456789"} 12 : {contents = "status_updated_at"} = } for key defaultUserObjectDictionary'

这是我的 User 对象字典在尝试保存它之前的样子:

This is what my User object dictionary looks like before I attempt to save it:

{
    "badge_count" = 0;
    email = "[e-mail]";
    "first_name" = exampleFirstName;
    id = 2;
    "last_name" = exampleLastName;
    "phone_number" = 0123456789;
    "profile_picture" = "http://myDevServer.com/pictures/userName.jpg";
    "status_id" = "<null>";
    "status_updated_at" = "<null>";
    "user_name" = userName;
}

是否由于我的 User 对象 NSDictionary 中存在空值而崩溃?我尝试使用带有空值的伪数据的常规 NSDictionary ，它可以正常工作.如果这是问题，我该如何绕过?有时我的 User 对象将具有可为空的属性.

Is it crashing because there a null values in my User object NSDictionary? I tried with a regular NSDictionary with dummy data with null values and it worked. If this is the problem, how to I bypass this? Sometimes my User object will have properties that are nullable.

推荐答案

字典中的某些对象或键具有类，该类不支持属性列表序列化.请查看此答案以获取详细信息:支持的属性列表ObjC类型

Some of your objects or keys in dictionary have class, that doesn't support property list serialization. Please, see this answer for details: Property list supported ObjC types

我建议检查对象的键"profile_picture"-它可能是NSURL.

I recommend to check object for key "profile_picture" - it may be NSURL.

如果这样做没有帮助，则可以使用以下代码来识别不兼容的对象:

If that doesn't help, you may use following code to identify incompatible object:

for (id key in userObjectDictionary) {
    NSLog(@"key: %@, keyClass: %@, value: %@, valueClass: %@",
          key, NSStringFromClass([key class]),
          userObjectDictionary[key], NSStringFromClass([userObjectDictionary[key] class]));
}

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