Customize MKAnnotation Callout View?

It should first be noted that the simplest changes to the callout are enabled by simply adjusting the properties of the system provided callout, but customizing the right and left accessories (via rightCalloutAccessoryView and leftCalloutAccessoryView). You can do that configuration in viewForAnnotation.

Since iOS 9, we have access to the detailCalloutAccessoryView which, replaces the subtitle of the callout with a potentially visually rich view, while still enjoying the automatic rendition of the callout bubble (using auto layout makes this easier).

For example, here is a callout that used a MKSnapshotter to supply the image for an image view in the detail callout accessory as demonstrated in WWDC 2015 video What's New in MapKit:

You can achieve this with something like:

class SnapshotAnnotationView: MKPinAnnotationView {    override var annotation: MKAnnotation? { didSet { configureDetailView() } }    override init(annotation: MKAnnotation?, reuseIdentifier: String?) {        super.init(annotation: annotation, reuseIdentifier: reuseIdentifier)        configure()    }    required init?(coder aDecoder: NSCoder) {        super.init(coder: aDecoder)        configure()    }}private extension SnapshotAnnotationView {    func configure() {        canShowCallout = true        configureDetailView()    }    func configureDetailView() {        guard let annotation = annotation else { return }        let rect = CGRect(origin: .zero, size: CGSize(width: 300, height: 200))        let snapshotView = UIView()        snapshotView.translatesAutoresizingMaskIntoConstraints = false        let options = MKMapSnapshotter.Options()        options.size = rect.size        options.mapType = .satelliteFlyover        options.camera = MKMapCamera(lookingAtCenter: annotation.coordinate, fromDistance: 250, pitch: 65, heading: 0)        let snapshotter = MKMapSnapshotter(options: options)        snapshotter.start { snapshot, error in            guard let snapshot = snapshot, error == nil else {                print(error ?? "Unknown error")                return            }            let imageView = UIImageView(frame: rect)            imageView.image = snapshot.image            snapshotView.addSubview(imageView)        }        detailCalloutAccessoryView = snapshotView        NSLayoutConstraint.activate([            snapshotView.widthAnchor.constraint(equalToConstant: rect.width),            snapshotView.heightAnchor.constraint(equalToConstant: rect.height)        ])    }}

Of course, you would then register that annotation view with your map, and no mapView(_:viewFor:) would be needed at all:

mapView.register(SnapshotAnnotationView.self, forAnnotationViewWithReuseIdentifier: MKMapViewDefaultAnnotationViewReuseIdentifier)

If you're looking for a more radical redesign of the callout or need to support iOS versions prior to 9, it takes more work. The process entails (a) disabling the default callout; and (b) adding your own view when the user taps on the existing annotation view (i.e. the visual pin on the map).

The complexity then comes in the design of the callout, where you have to draw everything you want visible. E.g. if you want to draw a bubble to yield the popover feel of the call out, you have to do that yourself. But with some familiarity with how to draw shapes, images, text, etc., you should be able to render a callout that achieves the desired UX:

Just add the view as a subview of the annotation view itself, and adjust its constraints accordingly:

func mapView(_ mapView: MKMapView, didSelect view: MKAnnotationView) {    let calloutView = ...    calloutView.translatesAutoresizingMaskIntoConstraints = false    calloutView.backgroundColor = UIColor.lightGray    view.addSubview(calloutView)    NSLayoutConstraint.activate([        calloutView.bottomAnchor.constraint(equalTo: view.topAnchor, constant: 0),        calloutView.widthAnchor.constraint(equalToConstant: 60),        calloutView.heightAnchor.constraint(equalToConstant: 30),        calloutView.centerXAnchor.constraint(equalTo: view.centerXAnchor, constant: view.calloutOffset.x)    ])}

See https://github.com/robertmryan/CustomMapViewAnnotationCalloutSwift for an example of creating your own callout view. This only adds two labels, but it illustrates the fact that you can draw the bubble any shape you want, use constraints to dictate the size of the callout, etc.

No need to make MKAnnotationView Custom class just create an empty view .xib and design .xib as your requirement. Write your business login in UIView swift class.

Add the view on

func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {

...

}

method like annotationView?.detailCalloutAccessoryView = customView

func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {    let annotationIdentifier = "AnnotationIdentifier"    var annotationView: MKAnnotationView?    if let dequeuedAnnotationView = mapView.dequeueReusableAnnotationView(withIdentifier: annotationIdentifier) {        annotationView = dequeuedAnnotationView        annotationView?.annotation = annotation    } else {        annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: annotationIdentifier)    }    if let annotation = annotation as? HPAnnotation {       annotationView?.canShowCallout = true       let customView = Bundle.main.loadNibNamed("HPAnnotationView", owner: self, options: nil)?.first as! HPAnnotationView       customView.labelName.text = annotation.annotationTitle       annotationView?.detailCalloutAccessoryView = customView    }    return annotationView }

If you want dynamic value show on callout view then first make MKAnnotation custom class where you can pass objects as you need.

import MapKitimport AddressBookimport UIKitclass HPAnnotation: NSObject, MKAnnotation {   let title: String?   let annotationTitle: String   init(title: String, annotationTitle: String = "") {      self.title = title      self.annotationTitle = annotationTitle   }   var subtitle: String? {     return details   }

}

and pass value when creating annotation

 for index in 0..<searchPeopleArray.count {    let annotation = HPAnnotation(title: "", annotationTitle: "")    mapView.addAnnotation(annotation)}

N.B: Here HPAnnotationView is my custom view class and xib name. HPAnnotation is my custom MKAnnotation.

Create Cocoa file with classtype MKAnnotationView

CustomeAnnotationView.h file

@interface CustomeAnnotationView : MKAnnotationView@property (strong, nonatomic) UIButton *buttonCustomeCallOut;- (void)setSelected:(BOOL)selected animated:(BOOL)animated;@end

CustomeAnnotationView.m file

@implementation CustomeAnnotationView-(id)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self) {        // Initialization code    }    return self;}- (void)setSelected:(BOOL)selected animated:(BOOL)animated{    [super setSelected:selected animated:animated];    if(selected)    {            self.buttonCustomeCallOut = [UIButton buttonWithType:UIButtonTypeCustom];//iconShare//iconShareBlue            [self.buttonCustomeCallOut addTarget:self action:@selector(buttonHandlerCallOut:) forControlEvents:UIControlEventTouchDown];        [self.buttonCustomeCallOut setBackgroundColor:[UIColor blueColor]];            [self.buttonCustomeCallOut setFrame:CGRectMake(-40,-80, 100, 100)];            [self addSubview:self.buttonCustomeCallOut];        [self.buttonCustomeCallOut setUserInteractionEnabled:YES];    }    else    {        //Remove your custom view...        [self.buttonCustomeCallOut setUserInteractionEnabled:NO];        [self.buttonCustomeCallOut removeFromSuperview];        self.buttonCustomeCallOut=nil;    }}-(void)buttonHandlerCallOut:(UIButton*)sender{    NSLog(@"Annotation Clicked");}- (UIView*)hitTest:(CGPoint)point withEvent:(UIEvent*)event{    UIView* v = [super hitTest:point withEvent:event];    if (v != nil)    {        [self.superview bringSubviewToFront:self];    }    return v;}- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent*)event{    CGRect rec = self.bounds;    BOOL isIn = CGRectContainsPoint(rec, point);    if(!isIn)    {        for (UIView *v in self.subviews)        {            isIn = CGRectContainsPoint(v.frame, point);            if(isIn)                break;        }    }    return isIn;}@end

place this code where u want to create custome call out

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {    static NSString *identifier = @"CustAnnotation";        CustomeAnnotationView *annotationView = (CustomeAnnotationView *) [self.mapView dequeueReusableAnnotationViewWithIdentifier:identifier];        if (annotationView == nil) {            annotationView = [[CustomeAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];        }        annotationView.enabled = YES;        annotationView.canShowCallout = NO;        annotationView.centerOffset = CGPointMake(0,-10);//-18        return annotationView;}