macOS Set label programmatically in Xcode

[ifrit05]

Heya, was just wondering how to set a label programmatically in Xcode.

For example, I have a label set as *Placeholder*, but when the app is ran on a machine, I want the label to display the value returned of "sysctl -a | grep machdep.cpu.brand_string" (which outputs something like "
Intel(R) Core(TM) i7-2635QM CPU @ 2.00GHz")

Also, using awk (or a similar tool), I would like to cut out the (R), (TM), and " @ 2.00GHz".

Would this be possible?

Thanks for any help!

 

[any-key]

Heya, was just wondering how to set a label programmatically in Xcode.

For example, I have a label set as *Placeholder*, but when the app is ran on a machine, I want the label to display the value returned of "sysctl -a | grep machdep.cpu.brand_string" (which outputs something like "
Intel(R) Core(TM) i7-2635QM CPU @ 2.00GHz")

Also, using awk (or a similar tool), I would like to cut out the (R), (TM), and " @ 2.00GHz".

Would this be possible?

Thanks for any help!

Part 1: To set a label's text in your interface you need to create an IBOutlet in your code. Then bind it to the label on the *.xib file with your Interface. Ctrl + drag from the label in the interface to the IBOutlet.

// the outlet
@IBOutlet weak var label: NSTextField!
...
// set the text
label.stringValue = "your text"

This tutorial is more then you need but scroll down to the section "Living in the Past — A Past Tense Verb". The binding stuff is explained right there.


Part 2: To get the output from a given shell command you need to execute it using an NSTask (tutorial here).

 

[cqexbesd]

the value returned of "sysctl -a | grep machdep.cpu.brand_string" (which outputs something like "
Intel(R) Core(TM) i7-2635QM CPU @ 2.00GHz")

Also, using awk (or a similar tool), I would like to cut out the (R), (TM), and " @ 2.00GHz".

It's possible but I would highly recommend you don't call out to a shell for this - you should be able to get the same string by calling the sysctl function from your code.

 

[--R0B--]

You could use something like:

#import <IOKit/IOKitLib.h>
#import <sys/types.h>
#import <sys/sysctl.h>
#import <string.h>




{
...
   label.stringValue = self.CPUBrandString;
...
}

+ (NSString *)CPUBrandString
{
char      buffer [256];
size_t    sz = sizeof (buffer);
NSString *str;
char *p;

   if (sysctlbyname ("machdep.cpu.brand_string", buffer, &sz, NULL, 0) == 0)
      {
      buffer [sizeof (buffer) - 1] = 0;

      // Remove everything from '@' to remove the CPU speed.
      if ((p = strrchr (buffer, '@')))
         *p = 0;

      // Turn buffer into an NSString then remove (R) and (TM) from the string.
      str = [NSStringstringWithCString:buffer encoding:[NSStringdefaultCStringEncoding]];

      str = [str stringByReplacingOccurrencesOfString:@"(R)" withString:@""];
      str = [str stringByReplacingOccurrencesOfString:@"(TM)" withString:@""];

      return (str);
      }

    return (nil);
}

 

[ifrit05]

Thanks for the pointers guys. Just read over --ROB--'s post and it does make sense what he's saying.
for the time being I figured I'd learn Swift and then try again once I get better with it.

 

[ArtOfWarfare]

There's almost certainly a C library that will get the string for you, no need to call the shell. Probably no need to use sysctl either - I'd imagine there's something higher level than that.