Draw Rectangle on the MapView - ios

Question

My application gets data in the following coverage area. I would like to use these boundary values to draw rectangle on the map. Do you have any idea? Thanks in advance
Left Upper Boundary: 30.439217,-95.899668;
Right Upper Boundary: 30.443953,-94.685679;
Left Buttom boundary: 28.930662,-95.908595;
Right Buttom Boundary: 28.930061,-94.690486;

Answer 1

if you wanna draw something basic with lines u can use this MKPolyline
Try the code below, Make sure your delegate is connected with your mapview object
- (void) drawRect
{
CLLocation *coordinates1 = [[CLLocation alloc] initWithLatitude:30.439217 longitude:-95.899668];
CLLocation *coordinates2 = [[CLLocation alloc] initWithLatitude:30.443953 longitude:-94.685679];
CLLocation *coordinates3 = [[CLLocation alloc] initWithLatitude:28.930061 longitude:-94.690486];
CLLocation *coordinates4 = [[CLLocation alloc] initWithLatitude:28.930662 longitude:-95.908595];
NSMutableArray *locationCoordinates = [[NSMutableArray alloc] initWithObjects:coordinates1,coordinates2,coordinates3,coordinates4,coordinates1, nil];
int numberOfCoordinates = [locationCoordinates count];
CLLocationCoordinate2D coordinates[numberOfCoordinates];
for (NSInteger i = 0; i < [locationCoordinates count]; i++) {
CLLocation *location = [locationCoordinates objectAtIndex:i];
CLLocationCoordinate2D coordinate = location.coordinate;
coordinates[i] = coordinate;
}
MKPolyline *polyLine = [MKPolyline polylineWithCoordinates:coordinates count:numberOfCoordinates];
[self.myMapView addOverlay:polyLine];
}
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay {
MKPolylineView *polylineView = [[MKPolylineView alloc] initWithPolyline:overlay];
polylineView.strokeColor = [UIColor redColor];
polylineView.lineWidth = 1.0;
return polylineView;
}
UPDATE: Here's the swift version of the drawRect function
func drawRect() {
let coordinates1 = CLLocation(latitude: 30.439217, longitude: -95.899668)
let coordinates2 = CLLocation(latitude: 30.443953, longitude: -94.685679)
let coordinates3 = CLLocation(latitude: 28.930061, longitude: -94.690486)
let coordinates4 = CLLocation(latitude: 28.930662, longitude: -95.908595)
let locationCoordinates = [coordinates1,coordinates2,coordinates3,coordinates4,coordinates1]
let coordinates = locationCoordinates.map { $0.coordinate }
let polyLine = MKPolyline(coordinates: coordinates, count: coordinates.count)
mapView.addOver(polyLine)
}
replace the
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay (deprecated)
with
func mapView(mapView: MKMapView, rendererForOverlay overlay: MKOverlay) -> MKOverlayRenderer

Answer 2

Since you've asked a general question I can only give you a general hint at the answer.
MKMapView has a method convertCoordinate:toPointToView: which turns a coordinate to a point in the view. You can use this to draw on an overlay.

Answer 3

First:
#import <QuartzCore/QuartzCore.h>
Then do this where you want:
CLLocationCoordinate2D koor = CLLocationCoordinate2DMake(30.439217,-95.899668);
CLLocationCoordinate2D koor2 = CLLocationCoordinate2DMake(30.443953,-94.685679);
CLLocationCoordinate2D koor3 = CLLocationCoordinate2DMake(28.930662,-95.908595);
CGPoint point1 = [mapView convertCoordinate:koor toPointToView:mapView];
CGPoint point2 = [mapView convertCoordinate:koor2 toPointToView:mapView];
CGPoint point3 = [mapView convertCoordinate:koor3 toPointToView:mapView];
UIView *someView = [[UIView alloc]initWithFrame:CGRectMake(point1.x, point1.y, point2.x-point1.x, point3.y-point1.y)];
[self viewBicimle:someView];
[someView setBackgroundColor:[UIColor clearColor]];
[someView.layer setBorderColor:[[[UIColor blackColor] colorWithAlphaComponent:1.0] CGColor]];
[someView.layer setBorderWidth:1.0];
[mapView addSubview:someView];
[someView release];
But this will only work for an immovable some MapView. When you move the map it will slide...