错误“调用中的参数‘坐标’缺少参数”
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【中文标题】错误“调用中的参数‘坐标’缺少参数”【英文标题】:Error "Missing argument for parameter 'coordinate' in call" 【发布时间】:2016-08-03 10:01:10 【问题描述】:我有一个自定义的 MkAnnotation,它有一个标题、副标题和与之关联的额外信息,用于地图视图。我将此信息传递给另一个 UIViewController。但是,我为引脚分配的坐标似乎存在一些问题。错误在下面代码“var bridge17pin = MyAnnotation()”行的pin设置信息中突出显示。
override func viewDidLoad()
super.viewDidLoad()
//for users location
myLocMgr.desiredAccuracy = kCLLocationAccuracyBest
myLocMgr.requestWhenInUseAuthorization()
myLocMgr.startUpdatingLocation()
myLocMgr.delegate = self
mapView.delegate = self
//coordinate for pin
var bridge17 = CLLocationCoordinate2DMake(53.346061, -6.227379)
//custom MKAnnotation
class MyAnnotation: NSObject, MKAnnotation
@objc var coordinate: CLLocationCoordinate2D
var EXTRA_INFORMATION: String?
var title: String?
init(coordinate: CLLocationCoordinate2D)
self.coordinate = coordinate
//setting information of pin
var bridge17pin = MyAnnotation()
bridge17pin.coordinate = bridge17
bridge17pin.title = "The bridge"
bridge17pin.subtitle = "hello this is the bridge"
bridge17pin.EXTRA_INFORMATION = "this was built in 2010"
mapView.addAnnotation(bridge17pin)
【问题讨论】:
【参考方案1】:因为您必须在实例化时发送坐标。所以在代码中替换
var bridge17pin = MyAnnotation()
与
var bridge17pin = MyAnnotation(coordinate: bridge17)
对于那个子标题see this link
【讨论】:
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