#selector vs Selector

TLDR: In Swift 3, use #selector instead of Selector (see here).

The warning (No method declared with Objective-C selector 'swipedLeft:') should be your first clue that there's a problem...



If you use this code in Swift 3, the left-swipe will result in an error like this:

2016-12-24 08:15:12.645 SpriteSimpleGame[65853:2987246] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[SpriteSimpleGame.GameScene swipedLeft:]: unrecognized selector sent to instance 0x7fb99e4101f0'

Worst of all, examples like this are all over the place because leaving out the colon results in a similar error.

Thanks to this answer I learned that what you want instead is this:

let swipeLeft = UISwipeGestureRecognizer(

    target: self,

    action: #selector(swipedLeft(sender:))

)

Thanks, internets!!

VNC black screen of sadness

Did you connect to your VNC server only to be greeted by a black screen of sadness? 

It happened to me not long ago and I don't know what made me try this, but here's what fixed it:

$ vncpasswd

As always, you're welcome.

Old code, new Xcode

When you download some old code from the Interwebs with such like:

[self.window addSubview:self.viewController.view];

and it runs just fine... and later you update Xcode and start getting runtime errors:

Applications are expected to have a root view controller at the end of application launch

Fortunately the fix is easy:

[self.window setRootViewController:self.viewController];

Thanks, Interwebs!!

LED Dice!

They cost me all of my diamonds, but I think it was worth it!

Major accomplishment

I did it!! I beat the Cheshire Cat in Yahtzee Buddies!! 

The dice are cool and all, but pretty hard to read...

I'll stick to my favorite bronze dice.

Beach Ball!!!

I finally got my beach ball dice! Yes, I had to beat 25 different opponents in 24 hours, but it was totally worth it, right? Right? 

But here's the thing. There's a bug - at least on iOS - where the progress of your wins against different opponents isn't getting updated. So if you want to earn the beach ball dice, KEEP A LIST OF THE PLAYERS YOU BEAT (and when) and then paste that information into a help request so customer service can give you credit for your achievement, as they did do for me. Thanks, Yahtzee! 

Now here's my whole lineup of dice. I do expect this will be my final update, since the remaining locked dice involve tournaments and dice masters that are impossible to beat without spending moneys on bonus rolls. C'est la vie! 

Yahtzee!!

My dice. Don't judge me. :-)

Swift selector argument - yes you can!

Selectors are an Objective C thing, but sometimes you have to use them in Swift.

For example, if you are calling performSelectorOnMainThread to work around the problem between GCD and UIWebView that causes hangs in stringByEvaluatingJavaScriptFromString (see here) you don't have a choice.

But how to pass an argument? I defined my selector function to take AnyObject? just as I assumed I should since withObject:AnyObject?

So tl;dr - here's what I was doing wrong. The colon at the end of the selector DOES MATTER. Well duh, of course it does, because it indicates there's an argument. Here's an example of everything working correctly...

  private func caller() {
    let arg = 42
    performSelectorOnMainThread("myfunc:", withObject: arg, waitUntilDone: false)
  }

  func myfunc(arg: AnyObject?) {
    guard let n = arg as? Int else {
      print("how did we get in this cornfield?")
      return
    }
    print("and here we are with our arg n: \(n)")
  }

...and the proof of the pudding - my, how tasty!

and here we are with our arg n: 42

I hope this saves somebody else a few hours of struggle!

What To Wear

Because I never ever remember...

°F	Just Right	Too Much	Not Enough
56	warm wicking T tech long sleeve T shorts	didn't need the hat or gloves or extra LST	n/a

Handy howmany commandy

Here's a handy little bit of... well it isn't really SQL, is it? Shell scripting and SQL*Plus, more like.

tcsh & csh

alias howmany "echo 'select count(*) from table;' | sqlplus -s 'xxxxxx/xxxxxx@(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=xxxxxx)(PORT=1521))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=xxxxxx)))'"

sh & bash

alias howmany="echo 'select count(*) from table;' | sqlplus -s 'xxxxxx/xxxxxx@(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=xxxxxx)(PORT=1521))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=xxxxxx)))'"

(for ksh use either) - and then...

$ howmany

Enjoy!

p.s. I'd love to add a pipe to

sed -e '/^$/ d; s/^\s-*//g'

but the dollar sign screws things up, at least in tcsh. Oh well!

Fergie playing Yahtzee!

Hard-to-read Podcasts

If you use the iOS Podcasts app, you've probably had occasion to swear at the producers of a podcast for their graphics and how they translate into dark text on a dark background. It's even worse in low light.

Well swear no more! At least not about this. It turns out there's a setting for that! Unfortunately, because this is iOS, you have to open the Settings app. Go there and choose Podcasts. And there aren't that many settings, so find this one, Custom Colors, and turn it off

And enjoy more podcasts!

Don't take checks from strangers

I don't tend to be alarmist, but this article has an important warning... when you deposit a check, everything you write on it can go back to whoever issued it - your account number, social security number... huge identity theft problem. 

http://www.westernjournalism.com/alert-people-are-getting-checks-in-the-mail-from-walmart-when-they-deposit-them/

Emacs cleanup

Because I'm always needing this between tasks...
 
;; kill buffers visiting /scratch or /tmp files
(defun cleanup ()
  (interactive)
  (let* (
         (n)
         (list)
         (file)
         )
    (setq list (buffer-list))
    (setq n 0)
    (save-excursion
      (dolist (elt list)
        (setq file (buffer-file-name (get-buffer elt)))
        (if (and
             file
             (or
              (string-match "^/scratch/" file)
              (string-match "^/tmp/" file)
              )
             )
            (progn
              (if (kill-buffer elt)
                  (setq n (+ n 1))
                )
              )
          )
        )
      (message "Delete %d buffer%s." n (if (= n 1) "" "s"))
      )
    )
  )

I Repeat...

I'm always forgetting how to repeat a command. Here's how in tcsh:

$ repeat 9999 sh -c 'now=`date +%s` ; date > /tmp/tmp ; then=`date +%s` ; diff=`expr ${then} - ${now}` ; echo xxxxx ${diff} xxxxx ; if [ ${diff} -gt 0 ] ; then date ; fi ; sleep 15'

(The inner command is /bin/sh, of course)

Hot and Sour Matzo Ball Soup

Ingredients:

• Swanson Chinese hot and sour broth 
• more broth (h&s or vegetable, optional)
• a can or two of mushrooms
• a scallion or two, chopped like you do
• matzo balls, prepared as directed on the back of a can of Manischewitz matzo meal

Note: you can use one or two boxes/cans of broth, depending on your desired broth/ball ratio. The amount of scallions & mushrooms would then tend to follow the broth.

Instructions:

1. Mix up the matzo ball ingredients and put them in the refrigerator.
2. Cut up the scallion(s) and put them, along with the mushrooms, into the broth.
3. Bring the broth and vegetables to a boil.
4. Add the matzo balls to the boily broth.
5. Lower the heat and simmer per the Manischewitz directions, about 30 minutes or so.

Listening Ports

Here's a handy command to find out which ports are listening:

/usr/sbin/lsof -P | sed -e '/(LISTEN)/ ! d; s/.* TCP .*:\([0-9][0-9]*\) .*/\1/' | sort -n | uniq

And ymmv, but sudo is probably a good way to run that.

Emacs Window Title

One of those things I'll forget if I don't write it down - how to change the title of an Emacs window.

M-x set-frame-name

th! Stack Overflow

New cron job

Welcome to my crontab, new cron job!

18 * * * * ps -feww | grep -v grep | grep python | wc -l | sed -e '/^[0-4]$/ d; s/$/ pythons are running/g'

Why? If you've ever run into the problem where python cron jobs start piling up because of abrtd, and you've restarted abrtd, this will help you keep an eye on things. Every hour on the 18 (so as not to run into one of my running python scripts) I'm counting python processes and if there are more than four, I'll hear about it.

Pet Peeve: "infinite number of"

Welcome to my long list of pet peeves, "infinite number of"!!

Why say "infinite number of monkeys" when you can just say "infinite monkeys"??