Glad that it helped. So which was the correct answer in this thread ?

Why don't you create the splitView in IB ? With 2 subviews, which are A and B. Then in the viewDidLoad of the splitView or even in applicationDidFinishLaunching, you can insert any object like this (to insert a dummy button in the first view (A for you if I understand well)): let button = NSButton(title: "New", target: self, action: nil) button.frame = CGRect(x: 20, y: 120, width: 100, height: 20) (self.splitView.subviews[0] as! NSScrollView).contentView.addSubview(button) With the same pattern, you can instantiate viewA and viewB and add them to the corresponding subview of the splitView. For the constraints, you can define them in the nib or programmatically (you should subclass NSScrollView for A and B to connect to the IBOutlets in that case). This is Swift, but you should have no problem to write it in objC. If that answers your question, don't forget to close the thread by marking this answer as correct. Otherwise, please explain the remaining problem.

when [[alloc] initWithNibName] returned, it was not guaranteed that those nibs would be loaded I do think it is loaded when initWithNibName returns. As for avoiding an extra view, I do not see this as a problem. There are so many objects allocated by the system, that even if you have hundreds of view, just an extra view each time will not make a difference. There are probably many other places in code more important top focus on if you need to optimize. In anycase, good to read it works. You should close the thread now.

Are you sure key is a valid SecKey ? A SecKey instance that represents a key that is stored in a keychain can be safely cast to a SecKeychainItem for manipulation as a keychain item. On the other hand, if the key is not stored in a keychain, casting the object to a SecKeychainItem and passing it to Keychain Services functions returns errors. Do you get a printed error ? If yes, which ? Do you get error when calling SecKeyVerifySignature ?

Did you try to do what you were asked to ? What happens then ?

My question was whether SecKeyVerifySignature did return true ?

What have you changed on your side ? update Xcode ? modified project ? Is the same occurring for every project ? Are you sure the error points to what you showed ? May be the line with dict dict keyCFBundleDevelopmentRegion/key stringen/string Could you post more of the info plist ?

Try changing line 12 by adding id:                 ForEach(group.ongoingItems, id:\.self) { item in

Could you show more complete code, so that we can understand how the pieces tie together and try to reproduce ?

Yes, it is annoying. That's not the case on SO… But a problem is that very few close the thread once they've got the answer they needed. May be a reason. I would advise you to file a bug (please report FB ref) and then… to close the thread.

So could you add complete code replicating the problem, so that we can test ?

I would first do an option-Clean Build Folder and see what happens. Could you tell what is the longest task reported in the log (could you copy the complete log ?)

If code works OK, that's the most important. From time to time, Xcode sends messages which should be ignored (they may be for debug use). Annoying but no real concern. However, you'd better file a bug report, in case.

The perfect filter does not exist. Even big companies have been compromised (I read that Xcode itself had been compromised in China 5 or 6 years ago). What I would do (and try to do myself): be cautious on the apps you download organise rolling backup of your important stuff (at least on 2 different physical support, where you alternate successive backups) apply a very strict discipline never to open a mail attachement if you are not 120% sure it is OK update OS to the last available security patches if one day you fear a machine has been compromised, immediately disconnect from the network and quarantine.

I have Downloaded update thrice time Downloaded what ?