PathMonitorViewController.m

#import "ViewController.h"
#import <Network/Network.h>

@interface ViewController ()
@property (strong,nonatomic) nw_path_monitor_t pathMonitor;
@end

@implementation ViewController


- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    self.pathMonitor = nw_path_monitor_create();
    nw_path_monitor_set_update_handler(self.pathMonitor, ^(nw_path_t  _Nonnull path) {
        NSLog(@"Network path changed");
        bool isExpensive = nw_path_is_expensive(path);
        NSLog(@"Path is expensive - %d",isExpensive);
    });
    nw_path_monitor_start(self.pathMonitor);
}


@end