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copied!<p>You use the <a href="http://developer.apple.com/library/ios/#documentation/Cocoa/Reference/Foundation/Classes/NSFileManager_Class/Reference/Reference.html#//apple_ref/c/data/NSFileProtectionComplete" rel="nofollow">NSFileProtectionComplete</a> feature (it's only available in ios 4 and greater).</p> <p>Here is an example of creating a NSPersistentStoreCoordinator for example.sqlite which is encrypted if used on ios4.</p> <pre><code>- (NSPersistentStoreCoordinator *)persistentStoreCoordinator { if (persistentStoreCoordinator != nil) { return persistentStoreCoordinator; } NSString *storePath = [[self applicationDocumentsDirectory] stringByAppendingPathComponent: @"example.sqlite"]; NSURL *storeUrl = [NSURL fileURLWithPath:storePath ]; NSError *error = nil; persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]]; if (![persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:nil error:&error]) { // Handle error } if(RSRunningOnOS4OrBetter()) { NSDictionary *fileAttributes = [NSDictionary dictionaryWithObject:NSFileProtectionComplete forKey:NSFileProtectionKey]; if (![[NSFileManager defaultManager] setAttributes:fileAttributes ofItemAtPath:storePath error:&error]) { // Handle error } } return persistentStoreCoordinator; } BOOL RSRunningOnOS4OrBetter(void) { static BOOL didCheckIfOnOS4 = NO; static BOOL runningOnOS4OrBetter = NO; if (!didCheckIfOnOS4) { NSString *systemVersion = [UIDevice currentDevice].systemVersion; NSInteger majorSystemVersion = 3; if (systemVersion != nil && [systemVersion length] > 0) { //Can't imagine it would be empty, but. NSString *firstCharacter = [systemVersion substringToIndex:1]; majorSystemVersion = [firstCharacter integerValue]; } runningOnOS4OrBetter = (majorSystemVersion >= 4); didCheckIfOnOS4 = YES; } return runningOnOS4OrBetter; } </code></pre>

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