Swift类：“无法将类型的值转换为预期的参数类型'AnyObject！'

I'm trying to convert a category in Objective C to swift. I'm not too familiar with even Objective C categories, and now I'm getting the error: "Cannot convert value of type 'SelectionBlock!' to expected argument type of 'AnyObject!'", and I'm not sure where to go from here.

我正在尝试将Objective C中的类别转换为swift。我对Objective C类别不太熟悉，现在我收到错误：“无法转换'SelectionBlock'类型的值！'预期的参数类型'AnyObject！'“，我不知道从哪里开始。

import Foundation
import MapKit
import ObjectiveC

var AssociatedObjectHandle: UInt8 = 0

extension MKPointAnnotation {

    typealias SelectionBlock = () -> Void

    var selectionBlock: SelectionBlock! {
        get {
            return objc_getAssociatedObject(self, &AssociatedObjectHandle) as! SelectionBlock
        }
        set(selectionBlock) {
            objc_setAssociatedObject(self, &AssociatedObjectHandle, selectionBlock, objc_AssociationPolicy.OBJC_ASSOCIATION_COPY)
        }
    }

}

1 个解决方案

#1

Caroline, try to force making selectionBlock in to AnyObject

Caroline，尝试强制将chooseBlock放入AnyObject

extension MKPointAnnotation {

    typealias SelectionBlock = () -> Void

    var selectionBlock: SelectionBlock! {
        get {
            return objc_getAssociatedObject(self, &AssociatedObjectHandle) as! SelectionBlock
        }
        set(selectionBlock) {
            objc_setAssociatedObject(self, &AssociatedObjectHandle, selectionBlock as! AnyObject, objc_AssociationPolicy.OBJC_ASSOCIATION_COPY)
        }
    }

}