如何斯威夫特CMutablePointer <MKMapPoint>設定值

Question

我試着去畫線2之間協調的MKMapView我有把所有的POI陣列， 所以我有這樣的代碼

var pointArr: CMutablePointer<MKMapPoint> = nil 

，我的問題是如何將值添加到pointArr？

Answer 1

您應該能夠創造MKMapPoint秒的陣列，並分配給您的指針：

let lax = MKMapPointForCoordinate(CLLocation(latitude: 33.9424955, longitude: -118.4080684).coordinate) 
let jfk = MKMapPointForCoordinate(CLLocation(latitude: 40.6397511, longitude: -73.7789256).coordinate) 
var points: MKMapPoint[] = [lax, jfk] 
let line = MKPolyline(points: &points, count: points.count) 

注意，一個CMutablePointer預計爲指向的東西可變 - 如果points聲明瞭let代替var，將其分配給可變指針（或將其傳遞給可變指針參數）將不起作用。

有關詳細信息，請參閱Pointers in 使用Swift with Cocoa和Objective-C。