Sidebar Sidebar
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

macOS Multi-threaded Programing with Cocoa

N

nikiski

macrumors regular
Original poster
Oct 30, 2007
183
0
Hong Kong, or Surrey, BC, Canada
Hi all, I am currently exploring different way to write multithreaded programs. Say I have a NSButton and a NSTextField, I also have a random string generator.

What I want to accomplish is that the string generator runs every x amount of seconds and updates the textfield, and when the button is pressed a random string is generated immediately while delaying the automatic run of the string generator by x amount of seconds. Say the string generator runs for 1 second and it isn't quite practical to have the whole UI freeze when it is running.

Any good suggestions? Thanks in advance. :)
 
wrldwzrd89

wrldwzrd89

macrumors G5
Jun 6, 2003
12,110
77
Solon, OH
You could also use NSOperation, but only if you're willing to sacrifice compatibility with pre-Leopard Mac OS X users. My understanding is that NSOperation is only available in Leopard.
 
Eraserhead

Eraserhead

macrumors G4
Nov 3, 2005
10,434
12,250
UK
wrldwzrd89 said:
You could also use NSOperation, but only if you're willing to sacrifice compatibility with pre-Leopard Mac OS X users. My understanding is that NSOperation is only available in Leopard.
Click to expand...

NSThread has also seen large improvements in Leopard, so its worth baring in mind.
 
savar

savar

macrumors 68000
Jun 6, 2003
1,950
0
District of Columbia
nikiski said:
Hi all, I am currently exploring different way to write multithreaded programs. Say I have a NSButton and a NSTextField, I also have a random string generator.

What I want to accomplish is that the string generator runs every x amount of seconds and updates the textfield, and when the button is pressed a random string is generated immediately while delaying the automatic run of the string generator by x amount of seconds. Say the string generator runs for 1 second and it isn't quite practical to have the whole UI freeze when it is running.

Any good suggestions? Thanks in advance. :)
Click to expand...

You don't need threads to accomplish this (although it could work) -- you could accomplish the same thing through NSTimer. The timer approach is easier because you don't have to communicate the button status between threads.
 
Krevnik

Krevnik

macrumors 601
Sep 8, 2003
4,100
1,309
savar said:
You don't need threads to accomplish this (although it could work) -- you could accomplish the same thing through NSTimer. The timer approach is easier because you don't have to communicate the button status between threads.
Click to expand...

Approved. :)

Seriously, for something like this, threading is nice, but adds complexity. Plus, you have the bonus that NSTimer just about has all the functionality you need, and doesn't block your thread either.
 
iSee

iSee

macrumors 68040
Oct 25, 2004
3,539
272
The OP did mention that the "string generator" itself would take a significant amount of time and didn't want the UI to pause while this was happening. To meet that requirement, I don't think NSTimer by itself will be sufficient.

You're going to need to at least run the string generator on different thread than the UI.
 
Eraserhead

Eraserhead

macrumors G4
Nov 3, 2005
10,434
12,250
UK
I have something in a different thread, so it can be cancelled and I use a Boolean to communicate between them, I'm not sure whether that is totally sound, but as its just a Boolean I think it should be OK...
 
N

nikiski

macrumors regular
Original poster
Oct 30, 2007
183
0
Hong Kong, or Surrey, BC, Canada
Thank you all very much for your input. I have resorted to use NSOperation and NSNotificationCenter as they pretty much do what I need to.

But I have another question, it's regarding IB and it's a little off topic, but I don't want to create a thread just for it.

It's about drawers. When I resize the parent window the drawer will get detached for some reason and it floats by itself. Only when I click on toggle will it resize properly. I have the drawer attached to the bottom of the parent window. I know I should have to code for it, but it's a bit annoying and ugly. Does anyone know where I can do that in IB? Or do I really have to code something?

(Note, I have seen the DrawerMadness example but I can't pick up any differences between it and my project.)
 
Sayer

Sayer

macrumors 6502a
Jan 4, 2002
981
0
Austin, TX
nikiski said:
It's about drawers. When I resize the parent window the drawer will get detached for some reason and it floats by itself. Only when I click on toggle will it resize properly. I have the drawer attached to the bottom of the parent window. I know I should have to code for it, but it's a bit annoying and ugly. Does anyone know where I can do that in IB? Or do I really have to code something?

(Note, I have seen the DrawerMadness example but I can't pick up any differences between it and my project.)
Click to expand...

Drawers should die instead of 64-bit carbon IMHO. If you really need some piece of UI to show up only in response to user action try using a sheet instead. Yeah a sheet is modal, but really if the UI needs to almost always be available then make a multi-pane view, or master-detail view.

Drawers are, just, yuck, so last century. Hey people can dog on other once-whizzy parts of OS X as being outmoded so can I.
 
Krevnik

Krevnik

macrumors 601
Sep 8, 2003
4,100
1,309
Sayer said:
Drawers should die instead of 64-bit carbon IMHO. If you really need some piece of UI to show up only in response to user action try using a sheet instead. Yeah a sheet is modal, but really if the UI needs to almost always be available then make a multi-pane view, or master-detail view.
Click to expand...

Another +1. :)

Drawers were a sort of weird UI control that really never worked as well as one hoped. Apple for the most part has abandoned drawers in their own software such as Mail, iCal and others.

You can do modal sheets, maybe a utility pane, or even a custom control for what you need... but in general, I haven't seen a usage of drawers that make users go "Oh hey, that works."
 
You must log in or register to reply here.
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.
Top Bottom