Change the title of a marker

#import "MarkerChangeText.h"
@import Wrld;


@interface MarkerChangeText ()

@property (nonatomic) WRLDMapView *mapView;

@end

@implementation MarkerChangeText
{
    NSTimer *myTimer;
    BOOL titleToggle;
    NSString* title1;
    NSString* title2;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    titleToggle = false;
    title1 = @"Initial marker text";
    title2 = @"Altered marker text";
    
    _mapView = [[WRLDMapView alloc] initWithFrame:self.view.bounds];
    
    _mapView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    
    [_mapView setCenterCoordinate:CLLocationCoordinate2DMake(37.7858, -122.401)
                        zoomLevel:15
                         animated:NO];
    
    [self.view addSubview:_mapView];
    
    WRLDMarker* marker = [WRLDMarker markerAtCoordinate:CLLocationCoordinate2DMake(37.784560, -122.402092)];
    marker.title = title1;
    [_mapView addMarker:marker];
    
    myTimer = [NSTimer scheduledTimerWithTimeInterval:2
                                               target:self
                                             selector:@selector(toggleText:)
                                             userInfo:marker
                                              repeats:YES];
}
    
- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
    [myTimer invalidate];
    myTimer = nil;
}

- (void)toggleText:(NSTimer *)timer
{
    WRLDMarker* marker = timer.userInfo;
    marker.title = titleToggle ? title1 : title2;
    titleToggle = !titleToggle;
}

@end