ios的開發中，小資料量的持久化都用nsuserdefaults來實現，但是nsuserdefaults只能儲存nsstring, nsnumber, nsdate, nsarray, nsdictionary這些資料型別，但大多時候，我們會將乙個物件實體做持久化的儲存，由於不是大批量的資料，不會用到sqlite，那麼這個時候nsuserdefaults會是很好的選擇，其實物件型別可以通過nscoding的委託方法來實現編碼和解碼。
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//// userentity.m
// nscodingdemo
//// created by on 11-5-20.
//#import "userentity.h"
#import "addressentity.h"
#define sampledata_key_username (@"username")
#define sampledata_key_gender (@"gender")
#define sampledata_key_age (@"age")
#define k_friends (@"frinds")
#define k_address (@"address")
#define k_userentity_addresses (@"addresses")
@implementation userentity
@synthesize username = _username;
@synthesize gender = _gender;
@synthesize age = _age;
@synthesize friends = _friends;
@synthesize address = _address;
@synthesize addresses = _addresses;
-(void
)dealloc
- (void
)encodewithcoder:(nscoder*)coder
- (id)initwithcoder:(nscoder*)decoder
self.username = [decoder decodeobjectforkey:sampledata_key_username];
self.gender = [decoder decodeboolforkey:sampledata_key_gender];
self.age = [decoder decodeintforkey:sampledata_key_age];
self.friends = [decoder decodeobjectforkey:k_friends];
self.address = [decoder decodeobjectforkey:k_address];
self.addresses = [decoder decodeobjectforkey: k_userentity_addresses];
} return
self;
}
@end
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//// addressentity.m
// nscodingdemo
//// created by on 11-5-20.
//#import "addressentity.h"
#define k_id (@"id")
#define k_addresentity_address (@"addrss")
@implementation addressentity
@synthesize id, address;
-(void
)dealloc
- (nsstring *)description
- (void
)encodewithcoder:(nscoder*)coder
- (id)initwithcoder:(nscoder*)decoder
self.address = [decoder decodeobjectforkey:k_addresentity_address];
self.id = [decoder decodeintforkey:k_id];
} return
self;
}
@end
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-(ibaction)read:(id)sender
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