How to write on /Library/Fonts folder on Mac with SMJobBless function

[pvagithub]

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I try to use SMJobBless function to authenticate for my application can do write on /Library/Fonts but not working,

if (![self blessHelperWithLabel:@"com.apple.bsd.SMJobBlessHelper" error:&error]) {
NSLog(@"Something went wrong! %@ / %d", [error domain], (int) [error code]);
} else {
//Access to this point.
/* At this point, the job is available. However, this is a very
* simple sample, and there is no IPC infrastructure set up to
* make it launch-on-demand. You would normally achieve this by
* using XPC (via a MachServices dictionary in your launchd.plist).
*/
NSLog(@"Job is available!");
bool result = false;
result = [[NSFileManager defaultManager] isWritableFileAtPath:@"/Library/Fonts"];
[self->_textField setHidden:false];
}
My application printed "Job is available" but when i check authorities write on /Library/Fonts, result is false
Thanks in advance.