1.从cache文件夹拷贝到document文件夹

NSString *sqlFile = @"test.zip";    NSArray *cachePath= NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);    NSString *cacheDir = [cachePath objectAtIndex:0];    NSString *databasePath = [cacheDir stringByAppendingPathComponent:sqlFile];    NSLog(databasePath);        NSFileManager *fileManager = [NSFileManager defaultManager];    // Copy the database sql file from the resourcepath to the documentpath    if ([fileManager fileExistsAtPath:databasePath])    {        //NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:sqlFile];        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);        NSString *documentpath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;        NSString* databasePathFromApp = [documentpath stringByAppendingString:@"/test.zip"] ;        NSLog(databasePathFromApp);        NSError *error;        [fileManager copyItemAtPath:databasePath toPath:databasePathFromApp error:&error];        //        if (error != nil) {        //            NSLog(@"[Database:Error] %@", error);        //        }    }

2.从document文件夹拷贝到cache文件夹

NSString *sqlFile = @"qxd.db";      NSArray *cachePath= NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);      NSString *cacheDir = [cachePath objectAtIndex:0];      NSString *databasePath = [cacheDir stringByAppendingPathComponent:sqlFile];                  NSFileManager *fileManager = [NSFileManager defaultManager];      // Copy the database sql file from the resourcepath to the documentpath      if (![fileManager fileExistsAtPath:databasePath]) {          NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:sqlFile];          NSError *error;          [fileManager copyItemAtPath:databasePathFromApp toPath:databasePath error:&error];  //        if (error != nil) {  //            NSLog(@"[Database:Error] %@", error);  //        }      }