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HTML5 发布时间：2022-04-27 发布网站：大佬教程 code.js-code.com

大佬教程收集整理的这篇文章主要介绍了ios – 在MKMapView上添加具有模糊效果的圈子，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。

我试图在地图上的叠加层上添加模糊效果.我实际上需要在地图上的一个圆圈上的模糊效果,我使用的方法不是那么重要.

我有一个类从MKCircleRenderer扩展,我想在它覆盖的地图上添加一个模糊效果.

我正在尝试使用-fillPath：inContext：方法,但是我对Core Graphics和Core @L_502_0@的无知导致我无处不在,我真的很失落了这个问题.

我试图使用CIFilter,因此我需要一个CIImage,我试图从上下文创建.但是我发现没有办法从上下文创建一个CGBitmapContext,CGImage和任何其他类.我尝试的任何方法导致了NULL,没有进一步的细节为什么.我不记得我试过的所有,所以我很抱歉没有指出任何事情.

我的课程目前实现一个不太重要的方法：

- (instanCETypE)initWithOverlay:(id<MKOverlay>)overlay {
    if (self = [super initWithOverlay:overlay]) {
        self.@L_616_17@Color = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:1];
        self.fillColor = [UIColor colorWithRed:0.4 green:0.2 blue:0.2 alpha:0.1];
        self.lineWidth = 1;
    }
    return self;
}

另一种可能是使用@L_848_18@mKAnnotation,并使用UIVisualEffectView在视图中添加模糊效果.这种方法的难点在于缩放时会增大/减小大小.

这应该适用于iOS 8

编辑

在这种情况下,圆圈内侧的地图应该模糊

解决方法

有两种方法可以做到这一点.

一个很简单,你可以使用图像

您@R_276_9381@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
    }


}