Question

现在我有一个mapview，根据一个类别填充一堆引脚，例如，“亚洲食品”＃。当我点击该注释的标注附件时，应用程序导航到详细视图控制器，我希望显示地址和其他属性。我从Yelp API CLient获取信息。这是我的模特：

import UIKit
import MapKit
var resultQueryDictionary:NSDictionary!

class Resturant: NSObject {
    var name: String!
    var thumbUrl: String!
    var address: String!
    var jsonData: NSData!
    var location: NSDictionary        // location


    init(dictionary: NSDictionary) {
        name = dictionary["name"] as? String
        thumbUrl = dictionary["thumbUrl"] as? String
        address = dictionary["address"] as? String
        self.location = dictionary["location"] as? NSDictionary ?? [:]
    }

    class func searchWithQuery(map: MKMapView, query: String, completion: ([Resturant]!, NSError!) -> Void) {
        YelpClient.sharedInstance.searchWithTerm(query,sort: 0, radius: 1069, success: { (operation: AFHTTPRequestOperation!, response: AnyObject!) -> Void in
            let responseInfo = response as! NSDictionary
            resultQueryDictionary = responseInfo
            println(responseInfo)
            let dataArray = responseInfo["businesses"] as! NSArray
            for business in dataArray {
                let obj = business as! NSDictionary
                var yelpBusinessMock: YelpBusiness = YelpBusiness(dictionary: obj)
                var annotation = MKPointAnnotation()
                annotation.coordinate = yelpBusinessMock.location.coordinate
                annotation.title = yelpBusinessMock.name
                annotation.subtitle = yelpBusinessMock.displayAddress
                attractionDetailAddressString = yelpBusinessMock.displayAddress
                map.addAnnotation(annotation)
            }
            }) { (operation: AFHTTPRequestOperation!, error: NSError!) -> Void in
         println(error)
        }
    }
    // term: String, deal: Bool, radius: Int, sort: Int, categories: String, success: (AFHTTPRequestOperation!, AnyObject!) -> Void, failure: (AFHTTPRequestOperation!, NSError!) -> Void) -> AFHTTPRequestOperation! {

    class func searchWithQueryWithRadius(map: MKMapView, term: String, deal: Bool, radius: Int, sort: Int, categories: String, completion: ([Resturant]!, NSError!) -> Void) {
        YelpClient.sharedInstance.searchWithTerm(term, deal: false, radius: radius, sort: sort,categories: categories, success: { (operation: AFHTTPRequestOperation!, response: AnyObject!) -> Void in
            let responseInfo = response as! NSDictionary
            resultQueryDictionary = responseInfo
            println(responseInfo)
            let dataArray = responseInfo["businesses"] as! NSArray
            for business in dataArray {
                let obj = business as! NSDictionary
                var yelpBusinessMock: YelpBusiness = YelpBusiness(dictionary: obj)
                var annotation = MKPointAnnotation()
                annotation.coordinate = yelpBusinessMock.location.coordinate
                annotation.title = yelpBusinessMock.name
                map.addAnnotation(annotation)
            }
            }) { (operation: AFHTTPRequestOperation!, error: NSError!) -> Void in
            println(error)
        }
    }

}

在我的景点ViewController中（用户点击类别用引脚填充地图），我有这个代码用于点击标注附件：

func mapView(mapView: MKMapView!, annotationView view: MKAnnotationView!, calloutAccessoryControlTapped control: UIControl!) {
        if (control == view.rightCalloutAccessoryView) {
            let selectedLocation = view.annotation;
            let selectedCoordinate = view.annotation.coordinate;
            var latitude = selectedCoordinate.latitude
            var longitude = selectedCoordinate.longitude
            var location:CLLocation = CLLocation(latitude: latitude, longitude: longitude)
            let businessPlacemark = MKPlacemark(coordinate: selectedCoordinate, addressDictionary: nil)
            indicatedMapItem = selectedCoordinate;
            let resturantMock:Resturant = Resturant(dictionary: resultQueryDictionary)
            attractionDict = resturantMock.location;
            performSegueWithIdentifier("attractionToDetail", sender: self);
        }
    }
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        var attractionsDetailViewController:AttractionsDetailViewController = segue.destinationViewController as! AttractionsDetailViewController
        attractionsDetailViewController.attractionLocation = indicatedMapItem;
        attractionsDetailViewController.attractionLocationDetail = self.attractionDict
    }

在我的详细信息视图控制器中，我尝试获取所点击的特定业务的数据。

func getYelpData() {
        var businessMock:Resturant = Resturant(dictionary: resultQueryDictionary)
        var address:NSDictionary = attractionLocationDetail //dictionary
        attractionDetailAddressString = businessMock.location["display_address"] as? String;
        self.addressLabel.text = attractionDetailAddressString
}

但是，这显示地址为零。

基本上我想知道如何从大型企业的NSDictionary获取业务的一个实例，然后在我的详细VC中检索该个别业务的数据。

如果您想查看所有代码，这是我的Github回购： https://github.com/ssharif6/Park-N-Go

感谢您的帮助！

Answer 1

看起来你的问题可能就在这一行

attractionDict = resturantMock.location;

您的词典将有一个位置键，但不拥有该位置子词典中建议的键：

init(dictionary: NSDictionary) {
    name = dictionary["name"] as? String
    thumbUrl = dictionary["thumbUrl"] as? String
    address = dictionary["address"] as? String
    self.location = dictionary["location"] as? NSDictionary ?? [:]
}

当VC加载时，所有这些值自然会nil。然而，这些键确实存在于resturantMock.business字典中 - 这是你打算写的吗？：）

如何从NSDictionary Swift中提取信息

1 个答案: