IOS 如何持久化自定义对象 2014-08-01 01:38
作者：互联网
如果持久话自定义对象 那么这个对象一定要遵循 NSCoding 协议 并实现编解码；然后再将编解码后的数据 NSKeyedArchiver 到NSData中
@interface NSKeyAndValue : NSObject <NSCoding> // 键值对象
@property (nonatomic, retain) NSString* m_strKey;
@property (nonatomic, retain) NSString* m_strValue;
@property (nonatomic, retain) NSString* m_strID;
@end
@implementation NSKeyAndValue
@synthesize m_strKey,m_strValue, m_strID;
- (void)encodeWithCoder:(NSCoder *)aCoder{
[aCoder encodeObject:self.m_strKey forKey:@"m_strKey"];
[aCoder encodeObject:self.m_strValue forKey:@"m_strValue"];
[aCoder encodeObject:self.m_strID forKey:@"m_strID"];
}
- (id)initWithCoder:(NSCoder *)aDecoder{
self = [super init];
if (self) {
self.m_strKey = [aDecoder decodeObjectForKey:@"m_strKey"];
self.m_strValue = [aDecoder decodeObjectForKey:@"m_strValue"];
self.m_strID = [aDecoder decodeObjectForKey:@"m_strID"];
}
return self;
}
读取和保存自定义对象方式如下：- (void)readMsgDataToMemory
{
NSString *key = @"mydata";
NSData *prevSavedData = [[NSUserDefaults standardUserDefaults] objectForKey:key];
NSMutableDictionary *decodedSingleObj = (NSMutableDictionary *)[NSKeyedUnarchiver unarchiveObjectWithData:prevSavedData];
[creatGroupInviterDictionary setDictionary:decodedSingleObj];
}
- (void)constantStoreOfflineSystemData
{
if ([creatGroupInviterDictionary.allKeys count] > 0)
{
NSString *key = @"mydata";
NSData *encodedSingleObj = [NSKeyedArchiver archivedDataWithRootObject:creatGroupInviterDictionary];
[[NSUserDefaults standardUserDefaults] setObject:encodedSingleObj forKey:key];
[[NSUserDefaults standardUserDefaults] synchronize];
}
}
creatGroupInviterDictionary 是存储 NSKeyAndValue 对象的键值对
标签：01,自定义,08,creatGroupInviterDictionary,NSString,strID,strValue,strKey,self 来源： https://www.cnblogs.com/lu-ping-yin/p/10992764.html