ios - 如何修复 "Instance member ' coordinate' cannot be used on type 'MKMapPoint' “Swift 5.0 中的错误

Question

我正在使用 Apple 的 Footprint: Indoor Positioning with Core Location sample code构建移动应用程序。此代码采用 Swift 3.0，我正在将其转换为 Swift 5.0 语法。 当我运行这段 Swift 3.0 代码时，

coordinate = MKCoordinateForMapPoint(boundingMapRect.getCenter())

我收到这个错误。

“MKCoordinateForMapPoint' has been replaced by property 'MKMapPoint.coordinate'”

当我将语法更改为

coordinate = MKMapPoint.coordinate (boundingMapRect.getCenter())

我收到此错误消息

“Instance member 'coordinate' cannot be used on type 'MKMapPoint'”

如何让这行代码运行？

Answer 1

Apple 在 MKMapRect 的扩展中定义了 getCenter():

extension MKMapRect {
    /**
        - returns: The point at the center of the rectangle.
        - parameter rect: A rectangle.
    */
    func getCenter() -> MKMapPoint {
        return MKMapPointMake(MKMapRectGetMidX(self), MKMapRectGetMidY(self))
        // now return MKMapPoint(x: self.midX, y: self.midY)
    }
}

因为 getCenter() 返回一个 MKMapPoint，你只需要访问它的 coordinate 属性:

coordinate = boundingMapRect.getCenter().coordinate