Attempt to set a non-property-list object as an NSUserDefaults

当使用NSUserDefault直接存储Facebook的token对象时，会报错（Attempt to set a non-property-list object as an NSUserDefaults），因为NSUserDefault无法直接存储自定义对象。

解决方法为：

1、存储对象

[cpp]  view plain copy

1. NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
2. NSData *tokenObject = [NSKeyedArchiver archivedDataWithRootObject:token];  
3. [userDefaults setObject:tokenObject forKey:@"FBToken"]; 
4.  [userDefaults synchronize];   
5. 
   

2、读取对象

[cpp]  view plain copy

1. NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];  
2. NSData *tokenObject = [userDefaults objectForKey:@"FBToken"];  
3. FBSDKAccessToken * token = [NSKeyedUnarchiver unarchiveObjectWithData:tokenObject];  
4. 
   

参考资料：

http://stackoverflow.com/questions/19720611/attempt-to-set-a-non-property-list-object-as-an-nsuserdefaults

http://blog.youkuaiyun.com/chyroger/article/details/5785297（实现原理以及如何实现存储自定义对象