NSKeyedArchiver

NSKeyedArchiver

Get document directory
NSString *documentDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *filePath = [documentDir stringByAppendingPathComponent:@"file.bin"];

Save
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:object];
[NSKeyedArchiver archiveRootObject:data toFile:filePath];

Load
NSData *data = [NSKeyedUnarchiver unarchiveObjectWithFile:filePath];
id object = [NSKeyedUnarchiver unarchiveObjectWithData:data];