StuartFarmer

// Set up the CV Video Camera object to bring in video to the program
    videoCamera = [[CvVideoCamera alloc] initWithParentView:self.imageView];
    videoCamera.defaultAVCaptureDevicePosition = AVCaptureDevicePositionBack;
    videoCamera.defaultAVCaptureSessionPreset = AVCaptureSessionPresetHigh;
    videoCamera.defaultAVCaptureVideoOrientation = AVCaptureVideoOrientationPortrait;
    videoCamera.defaultFPS = 30;
    videoCamera.grayscaleMode = NO;
    videoCamera.delegate = self;

StuartFarmer

// Initialize location services.
    locationManager = [[CLLocationManager alloc] init];
    [locationManager requestAlwaysAuthorization];
    locationManager.delegate = self;
    
    // Accuracy constants here. These should be tested for battery optimization.
    locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters;
    locationManager.distanceFilter = kCLDistanceFilterNone;
    
    [locationManager startUpdatingLocation];

StuartFarmer

CLLocationCoordinate2D mapCoordinate = ...; //user location or annot coord

MKMapPoint mapPoint = MKMapPointForCoordinate(mapCoordinate);

MKPolygonView *polygonView = 
    (MKPolygonView *)[mapView viewForOverlay:polygonOverlay];

CGPoint polygonViewPoint = [polygonView pointForMapPoint:mapPoint];

BOOL mapCoordinateIsInPolygon = 

StuartFarmer

- (IBAction)showToolbarButtonPressed:(id)sender {
    // Set up conditional to setup toggle feature.
    // This conditional checks if the toolbar is invisible, and if it is, it animates the opacity to 100%, otherwise, it assumes the toolbar is visible, and animates the opacity to 0%. Code can check any other conditionals, ie. self.toolbar.isHidden == YES, etc.
    if (self.toolbar.alpha == 0.0f) {
        
        // Disable button
        [self.showToolbarButton setEnabled:NO];
        
        // Fade toolbar in w/ Animation
        [UIView animateWithDuration:2.0f

StuartFarmer

MKMapRect zoomRect = MKMapRectNull;
for (id <MKAnnotation> annotation in mapView.annotations) {
    MKMapPoint annotationPoint = MKMapPointForCoordinate(annotation.coordinate);
    MKMapRect pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0, 0);
    if (MKMapRectIsNull(zoomRect)) {
        zoomRect = pointRect;
    } else {
        zoomRect = MKMapRectUnion(zoomRect, pointRect);
    }
}

StuartFarmer

// Put this in viewDidLoad where _webView is your targetted view
UIRefreshControl *refreshControl = [[UIRefreshControl alloc] init];
[refreshControl addTarget:self action:@selector(handleRefresh:) forControlEvents:UIControlEventValueChanged];
[_webView.scrollView addSubview:refreshControl];

// Declare this method elsewhere in the implementation file
-(void)handleRefresh:(UIRefreshControl *)refresh {
  // Code here
  [refresh endRefreshing];
}

StuartFarmer

// Import these Frameworks:
#import <MapKit/MapKit.h>

// Include this delegate
@interface ViewController () <MKMapViewDelegate>


- (void)viewDidLoad
{
  // Add this code to your preexisting viewDidLoad method