Добавить круг с эффектом размытия на MKMapView

Ответ 1

Итак, я закончил использование UIVisualEffectView поверх наложения. Хитрость заключалась в использовании CADisplayLink для сохранения вида на месте.

Вот пример кода, который выполняет задание (он игнорирует некоторые вещи, которые следует учитывать при фактическом выполнении этого приложения, например удаление ссылки, отслеживание того, что делается на viewDidAppear, в сочетании с вероятно, симметричная работа над viewWillDissapear или что-то еще, я мог бы использовать viewDidLoad, я думаю, но делал это при тестировании).

#import "ViewController.h"
#import <MapKit/MapKit.h>
#import <QuartzCore/QuartzCore.h>

@interface ViewController () {
    IBOutlet MKMapView *map;
    UIView *ov;
    MKCircle *c;
    UIVisualEffectView *ev;
}

@end

@implementation ViewController

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];

    CLLocationCoordinate2D center = CLLocationCoordinate2DMake(40.7828647,-73.9675438);
    c = [MKCircle circleWithCenterCoordinate:center radius:1000];
    [map addOverlay:c];
    MKCoordinateSpan span = MKCoordinateSpanMake(0.07, 0.07);
    MKCoordinateRegion region = MKCoordinateRegionMake(center, span);
    region = [map regionThatFits:region];
    [map setRegion:region animated:YES];

    ov = [[UIView alloc] init];
    ov.translatesAutoresizingMaskIntoConstraints = NO;
    ov.backgroundColor = [UIColor clearColor];
    ov.clipsToBounds = YES;
    ov.layer.borderWidth = 1;
    ov.layer.borderColor = [UIColor blackColor].CGColor;
    [map addSubview:ov];

    UIBlurEffect *blur = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
    ev = [[UIVisualEffectView alloc] initWithEffect:blur];
    [ov addSubview:ev];

    CADisplayLink *link = [CADisplayLink displayLinkWithTarget:self selector:@selector(update:)];
    [link addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSRunLoopCommonModes];
}

- (void)update:(CADisplayLink *)link {
    ov.frame = [map convertRegion:MKCoordinateRegionForMapRect(c.boundingMapRect) toRectToView:map];
    ov.layer.cornerRadius = ov.frame.size.height / 2;
    ev.frame = CGRectMake(0, 0, ov.frame.size.width, ov.frame.size.height);
}

@end

Изменить: Снимок экрана

Ответ 2

Есть два способа сделать это.

Один из них прост, вы можете просто использовать Image.

Возможно, вам понадобятся следующие изображения:

и код для использования в viewForAnnotation:

- (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];
        }
}

Другой способ сделать это программно [сделать круг самостоятельно]

Этот код может вам помочь.

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, animated: true, 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, completionHandler:
            {(placemarks: [AnyObject]!, 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, animated: true, 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
    }


}