That's also want I want. My framework is independent to just one app and is designed to be reusable by other apps too.

So this is indeed an extremely simple bug?

Extremely disappointed about Apple's software quality for past several years. :-(

How do I rebuild my projects so that result my.Framework or mylib.dylib contains the required dSYM?

I am forced to use an NSMutableArray and populate it using a loop: - (instancetype)initWith:(NSUInteger)capacity rolling:(BOOL)rolling { _list = [NSMutableArray arrayWithCapacity:capacity]; // Populate the array with all NSNull values. for (NSUInteger i = 0; i < capacity; i++) [_list addObject:NSNull.null]; }

Yes, this is just what I want. I wanted the experts to confirm that private and fileprivate at file level work the same way. BTW, I am quite familiar with private modifier inside enum/class/struct definitions.

I cannot access private or fileprivate vars in another file right? So what's the difference?

The info in the language reference does not explain what's the difference. It seems when used in file level private is same as fileprivate: class SandBoxVC: NSViewController { override func viewDidLoad() { super.viewDidLoad() print(aaaa, bbbb) // no compiler error here } } fileprivate let aaaa = 1234 private let bbbb = "bbbb" I almost believe this is an oversight bug in Swift compiler - private should not be used in file level.

That SO thread is about a custom X button. I want to know if there is any way to hook up the action of the system X button.

I also found out this soon after I posted my question: [NSRunLoop.currentRunLoop run];

I tend to use your answer after reading docs because NSPanel offers more features that are just what I need for a "preview" window.

I am on Appkit, it seems NSScrollView does not have onChange event, and I cannot find any properties/notifications that can tell me the current scroll position. That's odd.

I don't believe it's a bug. It's simply that I didn't know where to find the predefined key codes. import Carbon.HIToolbox does the job.

Ah, English is not my native language. And any legal documentation is cryptic to me, I can never understand them, even if they are written in my native language.

That's the missing little piece...