iOS单例归档

#define LBBAccountPath(path) [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:path]
#define REDPOINT @"redPoint.archive"

@interface RedPointModel : JSONModel

/**
 *  单例类
 */
+ (RedPointModel *)shared;

+ (void)saveRedPoint:(RedPointModel *)redPoint;

@end



@implementation RedPointModel

+ (RedPointModel *)shared
{
    static RedPointModel *shared = nil;
    static dispatch_once_t oncePredicate;
    dispatch_once(&oncePredicate, ^{
        if ([NSKeyedUnarchiver unarchiveObjectWithFile:LBBAccountPath(REDPOINT)] != nil) {
            shared = [NSKeyedUnarchiver unarchiveObjectWithFile:LBBAccountPath(REDPOINT)];
        }else {
            shared = [[self alloc] init];
        }

    });
    return shared;
}

+ (void)saveRedPoint:(RedPointModel *)redPoint {
    
    [NSKeyedArchiver archiveRootObject:redPoint toFile:LBBAccountPath(REDPOINT)];

}

@end