NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
//复制本地数据库文件到安装目录
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDirectory = [paths objectAtIndex:0];
//APP安装目录中的document目录路径
NSString *dbPath = [documentDirectory stringByAppendingPathComponent:@"CountryDictionary.db"];
if ([fileManager fileExistsAtPath:dbPath]==NO) {
//项目中的数据库文件路径
NSString *resourcePath = [[NSBundle mainBundle]pathForResource:@"CountryDictionary" ofType:@"db"];
[fileManager copyItemAtPath:resourcePath toPath:dbPath error:&error];
} else {
//更新APP Documnet目录的数据库文件，如果存在则先删除再复制最新的数据库文件过去。等本地数据库设计好后，下面的代码需要注释掉。
NSError *error;
if ([fileManager removeItemAtPath:dbPath error:&error]!=YES) {
NSLog(@"unable to delete file %@",[error localizedDescription]);
}
NSString*resourcePath =[[NSBundle mainBundle] pathForResource:@"CountryDictionary" ofType:@"db"];
[fileManager copyItemAtPath:resourcePath toPath:dbPath error:&error];
}
原文地址：http://blog.csdn.net/zh_2608/article/details/41750313
