*** -[NSUserDefaults setObject:forKey:]: Attempt to insert non-property value ‘<Student: 0x8399f70>’

查看官方的API，NSUserDefaults支持保存的数据类型有：NSData, NSString, NSNumber, NSDate, NSArray, or NSDictionary

对于，我们创建的NSObject不可以直接保存，如果调用setObject，会提示出错，信息如下：

*** -[NSUserDefaults setObject:forKey:]: Attempt to insert non-property value ‘<Student: 0x8399f70>’ of class ‘Student’.  Note that dictionaries and arrays in property lists must also contain only property values.

当保存一个Student对象时，提示我，NSUserDefaults没有这样的属性，那么如果想要保存student中的信息，可以将studnet的信息保存到一个NSDictionary中，然后获取到这个NSDictionary，再从它里面获取每一个属性；

当然这种方式弱爆了，注意一下上面保存的类型可以保存NSData类型，不防将Student类转换为NSData类型，然后

取值时再将NSData转化为Student类；

还是用代码来说明：

Student.h 代码

   1:  #import <Foundation/Foundation.h>

   2:   

   3:  @interface Student : NSObject <NSCoding>

   4:  {

   5:      NSString *name;

   6:  }

   7:  @property (nonatomic, retain) NSString *name;

   8:   

   9:   

  10:  @end

Student.ｍ 代码

   1:  #import "Student.h"

   2:   

   3:  @implementation Student

   4:  @synthesize name;

   5:   

   6:   

   7:  - (void)encodeWithCoder:(NSCoder *)aCoder

   8:  {

   9:      [aCoder encodeObject:self.name forKey:@"name"];

  10:  }

  11:   

  12:  - (id)initWithCoder:(NSCoder *)aDecoder

  13:  {

  14:      self = [super init];

  15:  if (self) {

  16:          self.name = [aDecoder decodeObjectForKey:@"name"];

  17:      }

  18:  return self;

  19:  }

  20:   

  21:   

  22:  - (void)dealloc

  23:  {

  24:      [name release];

  25:      name = nil;

  26:      [super dealloc];

  27:  }

  28:  @end

 

调用的代码：

   1:      Student *student = [[Student alloc] init];

   2:      [student setName:@"Jordy"];

   3:   

   4:      NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults];

   5:   

   6:      NSData *studentData = [NSKeyedArchiver archivedDataWithRootObject:student];

   7:      [userDefault setObject:studentData forKey:@"Student"];

   8:      [userDefault synchronize];

   9:      [student release];

  10:  

  11:  

  12:      NSData *data = [userDefault objectForKey:@"Student"];

  13:      Student *stu = [NSKeyedUnarchiver unarchiveObjectWithData:data];

  14:      NSLog(@"stu: %@, stu.name: %@",stu,stu.name);


转自：http://mario6.diandian.com/post/2013-02-28/40049432651