現在、Buttonを押すと値を表示しています。
表示をButtonを押さずとも更新して表示し、その値をコンソールにログを出力するにはどうすればいいでしょうか?

#import "ViewController.h"

@interface ViewController ()

//アンテナバー
@property (weak, nonatomic) IBOutlet UILabel *labelAntennaBar;
//RSSI
@property (weak, nonatomic) IBOutlet UILabel *labelRssi;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
}

- (IBAction)buttonGetValue:(id)sender {
    self.labelAntennaBar.text  = [NSString stringWithFormat:@"%zd", [self antennaBar]];
    self.labelRssi.text        = [NSString stringWithFormat:@"%zd", [self radioRssi]];
}


#pragma mark - Status bar

- (NSInteger )antennaBar {
    UIApplication *app = [UIApplication sharedApplication];
    NSArray *subviews = [[[app valueForKey:@"statusBar"]
                          valueForKey:@"foregroundView"] subviews];
    NSString *dataNetworkItemView = nil;

    for (id subview in subviews) {
        if ([subview isKindOfClass:[NSClassFromString(@"UIStatusBarSignalStrengthItemView") class]]) {
            dataNetworkItemView = subview;
            break;
        }
    }

    return  [[dataNetworkItemView valueForKey:@"signalStrengthBars"] intValue];
}

- (NSInteger )radioRssi {
    UIApplication *app = [UIApplication sharedApplication];
    NSArray *subviews = [[[app valueForKey:@"statusBar"]
                          valueForKey:@"foregroundView"] subviews];
    NSString *dataNetworkItemView = nil;

    for (id subview in subviews) {
        if([subview isKindOfClass:[NSClassFromString(@"UIStatusBarSignalStrengthItemView") class]]) {
            dataNetworkItemView = subview;
            break;
        }
    }

    return  [[dataNetworkItemView valueForKey:@"signalStrengthRaw"] intValue];
}

@end