Keep command line tool alive

问题

How would a keep a command-line tool running for ever.

This is my code:

#import <Foundation/Foundation.h>

int main (int argc, const char * argv[])
{

    @autoreleasepool {

        [[NSDistributedNotificationCenter defaultCenter] addObserverForName:nil object:nil queue:nil usingBlock:^(NSNotification *notification)
         {
             NSLog(@"%@", notification);
         }];

        //Keep alive...

    }
    return 0;
}

回答1:

You need to enter into a runloop using either CFRunLoop or NSRunLoop.

Try:

[[NSRunLoop currentRunLoop] run];

回答2:

In Swift 4,

RunLoop.current.run()

Cheers.

来源：https://stackoverflow.com/questions/9449123/keep-command-line-tool-alive