设置坐标时自定义MKA注释不移动 [英] custom MKAnnotation not moving when coordinate set

问题描述

我已经设置了自定义的MKA注释

I've got a custom MKAnnotation set up

class Location: NSObject, MKAnnotation {
    var id: Int
    var title: String?
    var name: String

    var coordinate: CLLocationCoordinate2D {
        didSet{
            didChangeValueForKey("coordinate")
        }
    }

当我设置坐标时，它不会在地图上移动图钉.我发现有人说这将迫使其更新，并在其中添加了带有关键字坐标的'didSet'.但没有，它不会动.我已经验证纬度/经度已更改并且正确，但销钉没有动.标题会更新并显示更改.

when i set the coordinate it does not move the pin on the map. I added the 'didSet' with the key word coordinate as i found people saying that would force it to update. but nothing, it doesn't move. i have verified the lat / long have changed and are correct, the pin just isn't moving. Title updates and displays the change.

我必须假设它是因为这是一个自定义注释.有帮助吗?

i have to assume its because this is a custom annotation. any help?

推荐答案

如果要手动发布这些更改事件，则必须致电

If you're going to manually post those change events, you have to call willChangeValue(forKey:) in willSet, too. In Swift 4:

var coordinate: CLLocationCoordinate2D {
    willSet {
        willChangeValue(for: \.coordinate)
    }
    didSet {
        didChangeValue(for: \.coordinate)
    }
}

或者在Swift 3中:

Or in Swift 3:

var coordinate: CLLocationCoordinate2D {
    willSet {
        willChangeValue(forKey: #keyPath(coordinate))  
    }
    didSet {
        didChangeValue(forKey: #keyPath(coordinate))
    }
}

或者，更简单的是，只需将其指定为dynamic属性，即可为您完成此通知.

Or, much easier, just specify it as a dynamic property and this notification stuff is done for you.

@objc dynamic var coordinate: CLLocationCoordinate2D

对于Swift 2版本，请参见此答案的先前版本.

For Swift 2 version, see previous rendition of this answer.

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