Here’s a little macro I created to get the System UIKit Strings:
#define UIKitLocalizedString(key) [[NSBundle bundleWithIdentifier:@"com.apple.UIKit"] localizedStringForKey:key value:@"" table:nil]
Use it like this:
UIKitLocalizedString(@"Search");
UIKitLocalizedString(@"Done");
UIKitLocalizedString(@"Cancel");
...