Swift - 将 NSMutableArray 转换为 MKAnotationViews 数组

Question

所以本质上，这就是我目前所拥有的。一个数组

var bars = [BarAnnotation(latitude: 42.022352, longitude: -93.650413, name: "Micky's Irish Pub", deal: "$2 Drinks 9PM-1AM"),

    BarAnnotation(latitude: 42.021948, longitude: -93.650348, name: "Cy's Roost", deal: "$2 Drinks 9PM-1AM")

我的自定义 BarAnnotation 类的数组。数组的大小显然是固定的。我一直在尝试从 JSON 文件加载条形数据，然后从那里创建数组。

func retrieveData(){

    var filePath = NSBundle.mainBundle().pathForResource("test", ofType: "json")
    var data = NSData.dataWithContentsOfMappedFile(filePath!) as NSData
    var json = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary

    var test = [] as NSMutableArray

    let barArray = json["bars"] as NSArray


    for bar in barArray{
        var name = bar["name"] as NSString
        var deal = bar["deal"] as NSString
        var lat = bar["lat"] as Double
        var long = bar["long"] as Double
        var negLong = -long

        var newBar = BarAnnotation(latitude: lat, longitude: negLong, name: name, deal: deal)

        test.addObject(newBar)


    }

    bars.arrayByAddingObjectsFromArray(test)
}

然后我想用这个数组“test”替换条。但是，test 是 NSMutableArray 类型，而 bar 是大小固定的 BarAnnotations 数组。当我尝试转换时，它会导致错误。我觉得这是一个简单的解决方法，我只是在这里遇到了困难。有人吗？

这是我的 BarAnnotation 类

class BarAnnotation: MKPointAnnotation {

var latitude, longitude, distance: Double
var name, imageName, deal: String
var location: CLLocationCoordinate2D
var loc: CLLocation
var annotation: MKPointAnnotation

init(latitude: Double, longitude: Double, name: String, deal: String) {
    self.latitude = latitude
    self.longitude = longitude
    self.name = name
    self.imageName = "image1.jpg"
    self.deal = deal
    self.distance = 0
    self.location = CLLocationCoordinate2D(latitude: latitude, longitude: longitude)
    self.loc = CLLocation(latitude: latitude, longitude: longitude)
    self.annotation = MKPointAnnotation()
    annotation.setCoordinate(self.location)
    annotation.title = name
    annotation.subtitle = deal
}

然后我尝试在这里访问它

        for bar in bars {
        var barName = bar.name.stringByReplacingOccurrencesOfString("\'", withString: "", options: NSStringCompareOptions.LiteralSearch, range: nil)
        var searchString = searchBar.text.stringByReplacingOccurrencesOfString("\'", withString: "", options: NSStringCompareOptions.LiteralSearch, range: nil)

        if barName.rangeOfString(searchString) != nil || barName.lowercaseString.rangeOfString(searchString.lowercaseString) != nil {
            var span = MKCoordinateSpanMake(0.005, 0.005)
            var region = MKCoordinateRegion(center: bar.location, span: span)
            mapView.setRegion(region, animated: true)
            mapView.selectAnnotation(bar.annotation, animated: true)
        }
    }

这是错误

Answer 1

您的 BarAnnotation 既继承自 MKPointAnnotation 又声明了 MKPointAnnotation 的属性 - 这没有意义。我假设您正在添加 bar.annotation 作为地图视图的注释 - 由于 BarAnnotation 继承自 MKPointAnnotation 您可以只添加 bar 本身。

class BarAnnotation: MKPointAnnotation {

        var distance: Double
        var name, imageName, deal: String


        init(latitude: Double, longitude: Double, name: String, deal: String) {
            self.distance=0
            self.name = name
            self.imageName = "image1.jpg"
            self.deal = deal
            super.init()
            self.coordinate = CLLocationCoordinate2D(latitude: latitude, longitude: longitude)
            self.title = name
            self.subtitle = deal
    }

}

我发现的一件事是，即使 BarAnnotation 继承自 MKPointAnnotation，如果您尝试直接访问 coordinate 属性，Swift 也会给出弃用错误。解决方案是将对象转换为MKPointAnnotation

for bar in bars  {
    let annotation=bar as MKPointAnnotation
    var barName = bar.name.stringByReplacingOccurrencesOfString("\'", withString: "", options: NSStringCompareOptions.LiteralSearch, range: nil)

    var searchString = searchBar.text.stringByReplacingOccurrencesOfString("\'", withString: "", options: NSStringCompareOptions.LiteralSearch, range: nil)

    if barName.rangeOfString(searchString) != nil || barName.lowercaseString.rangeOfString(searchString.lowercaseString) != nil {
        var span = MKCoordinateSpanMake(0.005, 0.005)
        var region = MKCoordinateRegion(center: annotation.coordinate, span: span)
        mapView.setRegion(region, animated: true)
        mapView.selectAnnotation(bar, animated: true)
    }
}