ios – 在MKMapView上添加具有模糊效果的圈子

一个很简单,你可以使用图像

您可能会发现以下图像很有用：

并在viewForAnnotation中使用它们的代码：

- (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) annotation
{   
    // ... get the annotation delegate and allocate the MKAnnotationView (annView)
        if ([annotationDelegate.type localizedCaseInsensitiveCompare:@"NeedsBluePin"] == NSOrderedSame)
        {
            UIImage * image = [UIImage imageNamed:@"blue_pin.png"];
            UIImageView *imageView = [[[UIImageView alloc] initWithImage:image] autorelease];
            [annView addSubview:imageView];
        }
}

其他方法以编程方式进行[让自己圈]

这是代码可以帮助你.

import UIKit
import AddressBook
import AddressBookUI
import MapKit
import CoreLocation
import MessageUI
import Social

class ViewController: UIViewController,ABPeoplePickerNavigationControllerDelegate,MFMailComposeViewControllerDelegate,MKMapViewDelegate {

    @IBOutlet weak var name: UILabel!
    @IBOutlet weak var email: UILabel!
    @IBOutlet weak var photo: UIImageView!
    @IBOutlet weak var map: MKMapView!

    let locMan:CLLocationManager=CLLocationManager()

    // Blurring Code
    @IBOutlet weak var labelBackground: UIView!
    var backgroundBlur: UIVisualEffectView!


    @IBAction func newbfF(sender: AnyObject) {
        let picker: ABPeoplePickerNavigationController =
            ABPeoplePickerNavigationController()
        picker.peoplePickerDelegate = self
        presentViewController(picker,animated: true,completion: nil)
    }

    @IBAction func sendEmail(sender: AnyObject) {
        var emailAddresses:[String]=[self.email.text!]
        var mailComposer:MFMailComposeViewController =
            MFMailComposeViewController()
        mailComposer.mailComposeDelegate=self;
        mailComposer.setToRecipients(emailAddresses)

        presentViewController(mailComposer,completion: nil)
    }

    func mailComposeController(controller: MFMailComposeViewController!,didFinishWithResult result: MFMailComposeResult,error: NSError!) {
        dismissViewControllerAnimated(true,completion: nil)
    }

    func peoplePickerNavigationController(peoplePicker: ABPeoplePickerNavigationController!,didSelectPerson person: ABRecord!) {

        let friendName:String = ABRecordcopyValue(person,kABPersonFirstNameProperty).takeRetainedValue() as String as String
        name.text=friendName

        let friendAddressSet:ABMultiValueRef = ABRecordcopyValue(person,kABPersonAddressproperty).takeRetainedValue()

        if ABMultiValueGetCount(friendAddressSet)>0 {
            let friendFirstAddress: Dictionary = ABMultiValuecopyValueAtIndex(friendAddressSet,0).takeRetainedValue() as NSDictionary
            showAddress(friendFirstAddress)
        }

        let friendEmailAddresses:ABMultiValueRef = ABRecordcopyValue(person,kABPersonEmailProperty).takeRetainedValue()

        if ABMultiValueGetCount(friendEmailAddresses)>0 {
            let friendEmail: String = ABMultiValuecopyValueAtIndex(friendEmailAddresses,0).takeRetainedValue() as String
            email.text=friendEmail
        }

        if ABPersonHasImageData(person) {
            photo.image = UIImage(data: ABPersoncopyImageData(person).takeRetainedValue())
        }
    }

    func showAddress(fullAddress:NSDictionary) {
        let geocoder: CLGeocoder = CLGeocoder()
        geocoder.geocodeAddressDictionary(fullAddress,completionHandler:
            {(placemarks: [AnyObject]!,error: NSError!) -> Void in
                let friendplacemark:CLPlacemark = placemarks[0] as CLPlacemark
                let mapRegion:MKCoordinateRegion =
                    MKCoordinateRegion(center: friendplacemark.location.coordinate,span: MKCoordinateSpanMake(0.2,0.2))
                self.map.setRegion(mapRegion,animated: true)
                let mapPlacemark: MKPlacemark = MKPlacemark(placemark: friendplacemark)
                self.map.addAnnotation(mapPlacemark)
        })
    }

    func mapView(aMapView: MKMapView!,viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {
            let pinDrop:MKPinAnnotationView = MKPinAnnotationView(annotation: annotation,reuseIdentifier: "myspot")
            pinDrop.animatesDrop=true
            pinDrop.canShowCallout=true
            pinDrop.pinColor=MKPinAnnotationColor.Purple
            return pinDrop
    }

    @IBAction func sendTweet(sender: AnyObject) {
        let geocoder: CLGeocoder = CLGeocoder()
        geocoder.reverseGeocodeLocation(map.userLocation.location,error: NSError!) -> Void in
                let myPlacemark:CLPlacemark = placemarks[0] as CLPlacemark
                let tweetText:String =
                    "Hello all - I'm currently in \(myPlacemark.locality)!"

                let tweetComposer: SLComposeViewController =
                    SLComposeViewController(forServiceType: SLServiceTypeTwitter)

                if SLComposeViewController.isAvailableForServiceType(SLServiceTypeTwitter) {
                    tweetComposer.setinitialText(tweetText)
                    self.presentViewController(tweetComposer,completion: nil)
                }
        })
    }


    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view,typically from a nib.
        //let locMan:CLLocationManager=CLLocationManager()
        locMan.requestWhenInUseAuthorization()

        let blur: UIBlurEffect = UIBlurEffect(style: UIBlurEffectStyle.Light)
        backgroundBlur = UIVisualEffectView (effect: blur)
        backgroundBlur.frame = labelBackground.frame
        view.insertSubview(backgroundBlur,belowSubview: labelBackground)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // dispose of any resources that can be recreated.
    }

    override func preferredStatusBarStyle() -> UIStatusBarStyle {
        return UIStatusBarStyle.LightContent
    }


}