Update callout delegate example to use fixed coordinate

`-showAnnotations:animated:` is broken for a single point: mapbox/mapbox-gl-native#5693.

Examples/ObjectiveC/CalloutDelegateUsageExample.m

@@ -27,7 +27,7 @@ - (void)viewDidLoad
  self.mapView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
  [self.view addSubview:self.mapView];
 
- // remember to set the delegate (or much of this will not work)
+ // Remember to set the delegate.
  self.mapView.delegate = self;
 
  [self addAnnotation];
@@ -42,10 +42,10 @@ - (void)addAnnotation
 
  [self.mapView addAnnotation:annotation];
 
- // fit the map to the annotation(s)
- [self.mapView showAnnotations:self.mapView.annotations animated:NO];
+ // Center the map on the annotation.
+ [self.mapView setCenterCoordinate:annotation.coordinate zoomLevel:17 animated:NO];
 
- // pop-up the callout view
+ // Pop-up the callout view.
  [self.mapView selectAnnotation:annotation animated:YES];
 }
 
@@ -58,7 +58,7 @@ - (UIView *)mapView:(MGLMapView *)mapView leftCalloutAccessoryViewForAnnotation:
 {
  if ([annotation.title isEqualToString:@"Kinkaku-ji"])
  {
- // callout height is fixed; width expands to fit
+ // Callout height is fixed; width expands to fit its content.
  UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 60.f, 50.f)];
  label.textAlignment = NSTextAlignmentRight;
  label.textColor = [UIColor colorWithRed:0.81f green:0.71f blue:0.23f alpha:1.f];
@@ -77,7 +77,7 @@ - (UIView *)mapView:(MGLMapView *)mapView rightCalloutAccessoryViewForAnnotation
 
 - (void)mapView:(MGLMapView *)mapView annotation:(id<MGLAnnotation>)annotation calloutAccessoryControlTapped:(UIControl *)control
 {
- // hide the callout view
+ // Hide the callout view.
  [self.mapView deselectAnnotation:annotation animated:NO];
 
  UIAlertView *alert = [[UIAlertView alloc] initWithTitle:annotation.title

Examples/Swift/CalloutDelegateUsageExample.swift

@@ -23,7 +23,7 @@ class CalloutDelegateUsageExample_Swift: UIViewController,
 
  view.addSubview(mapView)
 
- // remember to set the delegate (or much of this will not work)
+ // Remember to set the delegate.
  mapView.delegate = self
 
  addAnnotation()
@@ -37,10 +37,10 @@ class CalloutDelegateUsageExample_Swift: UIViewController,
 
  mapView.addAnnotation(annotation)
 
- // fit the map to the annotation(s)
- mapView.showAnnotations(mapView.annotations!, animated: false)
+ // Center the map on the annotation.
+ mapView.setCenterCoordinate(annotation.coordinate, zoomLevel: 17, animated: false)
 
- // pop-up the callout view
+ // Pop-up the callout view.
  mapView.selectAnnotation(annotation, animated: true)
  }
 
@@ -50,6 +50,7 @@ class CalloutDelegateUsageExample_Swift: UIViewController,
 
  func mapView(mapView: MGLMapView, leftCalloutAccessoryViewForAnnotation annotation: MGLAnnotation) -> UIView? {
  if (annotation.title! == "Kinkaku-ji") {
+ // Callout height is fixed; width expands to fit its content.
  let label = UILabel(frame: CGRectMake(0, 0, 60, 50))
  label.textAlignment = .Right
  label.textColor = UIColor(red: 0.81, green: 0.71, blue: 0.23, alpha: 1)
@@ -66,7 +67,7 @@ class CalloutDelegateUsageExample_Swift: UIViewController,
  }
 
  func mapView(mapView: MGLMapView, annotation: MGLAnnotation, calloutAccessoryControlTapped control: UIControl) {
- // hide the callout view
+ // Hide the callout view.
  mapView.deselectAnnotation(annotation, animated: false)
 
  UIAlertView(title: annotation.title!!, message: "A lovely (if touristy) place.", delegate: nil, cancelButtonTitle: nil, otherButtonTitles: "OK").show()