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场景是这样的：
现在有一个数组如下，数组中存放着自定义的对象GoodscCategory
<__NSArrayM 0x7ffb9c2032b0>( <GoodscCategory: 0x7ffb9c2079f0>, <GoodscCategory: 0x7ffb9c2229e0>, <GoodscCategory: 0x7ffb9c2217a0>, <GoodscCategory: 0x7ffb9c222c30>, <GoodscCategory: 0x7ffb9c21d710>, <GoodscCategory: 0x7ffb9c21afe0>, <GoodscCategory: 0x7ffb9c223ff0>, <GoodscCategory: 0x7ffb9c221f80>, <GoodscCategory: 0x7ffb9c21fcf0>, <GoodscCategory: 0x7ffb9c224bf0>, <GoodscCategory: 0x7ffb9c224c10>, <GoodscCategory: 0x7ffb9c21a0e0>, <GoodscCategory: 0x7ffb9c0a0550> )
在尝试将该数组存储在NSUserDefaults时，发生了如下错误：
Attempt to set a non-property-list object ( "<GoodscCategory: 0x7ffb9c2079f0>", "<GoodscCategory: 0x7ffb9c2229e0>", "<GoodscCategory: 0x7ffb9c2217a0>", "<GoodscCategory: 0x7ffb9c222c30>", "<GoodscCategory: 0x7ffb9c21d710>", "<GoodscCategory: 0x7ffb9c21afe0>", "<GoodscCategory: 0x7ffb9c223ff0>", "<GoodscCategory: 0x7ffb9c221f80>", "<GoodscCategory: 0x7ffb9c21fcf0>", "<GoodscCategory: 0x7ffb9c224bf0>", "<GoodscCategory: 0x7ffb9c224c10>", "<GoodscCategory: 0x7ffb9c21a0e0>", "<GoodscCategory: 0x7ffb9c0a0550>" ) as an NSUserDefaults/CFPreferences value for key sortDataArray
经过查询，发现原因是：
NSUserDefaults支持的数据格式有：NSNumber（Integer、Float、Double），NSString，NSDate，NSArray，NSDictionary，BOOL类型，
如果想要保存其他类型或者自定义类型需要用到archiver将数据序列化为NSData类型，需要在自定义类中写encode和decode两个方法。
GoodscCategory.h
#import <Foundation/Foundation.h> @interface GoodscCategory : NSObject @property (nonatomic,copy) NSString *categoryID; @property (nonatomic,copy) NSString *categoryName; @property (nonatomic,retain) NSArray *subCategoryList; @end
GoodscCategory.m
@implementation GoodscCategory - (void)encodeWithCoder:(NSCoder *)aCoder { [aCoder encodeObject:_categoryID forKey:@"id"]; [aCoder encodeObject:_categoryName forKey:@"name"]; [aCoder encodeObject:_subCategoryList forKey:@"list"]; } - (id)initWithCoder:(NSCoder *)aDecoder { if (self = [super init]) { self.categoryID = [aDecoder decodeObjectForKey:@"id"]; self.categoryName = [aDecoder decodeObjectForKey:@"name"]; self.subCategoryList = [aDecoder decodeObjectForKey:@"list"]; } return self; } @end
然后在存储的时候进行序列化
- (void)saveSortArrayData:(NSArray *)array { NSMutableArray *archiveArray = [NSMutableArray arrayWithCapacity:array.count]; for (GoodscCategory *goodsObject in array) { NSData *goodsEncodedObject = [NSKeyedArchiver archivedDataWithRootObject:goodsObject]; [archiveArray addObject:goodsEncodedObject]; } NSUserDefaults *userData = [NSUserDefaults standardUserDefaults]; [userData setObject:archiveArray forKey:@"sortDataArray"]; }
取出的时候反序列化
NSArray * dataArray = [[NSUserDefaults standardUserDefaults] objectForKey:@"sortDataArray"]; NSMutableArray *mutableArray = [[NSMutableArray alloc] init]; for (NSData *goodsData in dataArray) { GoodscCategory *goods = [NSKeyedUnarchiver unarchiveObjectWithData:goodsData]; [mutableArray addObject:goods]; }
这样，就实现了将数组array存入，使用的时候取出为数组mutableArray。
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原文地址：http://www.cnblogs.com/fanzhiying/p/5315308.html
