These function demonstrates how to change coordinate of the focused window

MoveWindow.swift

func moveWindow(_ appRef: AXUIElement, _ velocity: CGPoint) {
    do {
        var windowRef: AnyObject?
        try appRef.copyAttributeValue(kAXFocusedWindowAttribute, &windowRef)
        let windowElement: AXUIElement = windowRef as! AXUIElement

        var positionRef: CFTypeRef?
        try windowElement.copyAttributeValue(kAXPositionAttribute, &positionRef)

        var position = CGPoint()
        if !AXValueGetValue(positionRef as! AXValue, AXValueType.cgPoint, &position) {
            throw AppError.accessibility("AXValueGetValue has failed")
        }

        position += velocity

        if let positionAxValue = AXValueCreate(AXValueType.cgPoint, &position) {
            try windowElement.setAttributeValue(kAXPositionAttribute, positionAxValue)
        }

    } catch let AppError.accessibility(message, code) {
        debugPrint(message, code ?? "none")
    } catch {
        debugPrint("Unknown error has occurred.")
    }
}

extension AXUIElement {
    func copyAttributeValue(_ attribute: String, _ destination: UnsafeMutablePointer<CFTypeRef?>) throws {
        let result = AXUIElementCopyAttributeValue(self, attribute as CFString, destination)
        if result != AXError.success {
            throw AppError.accessibility("AXUIElementCopyAttributeValue has failed.", result.rawValue)
        }
    }

    func setAttributeValue(_ attribute: String, _ value: AXValue) throws {
        let result = AXUIElementSetAttributeValue(self, attribute as CFString, value)
        if result != AXError.success {
            throw AppError.accessibility("AXUIElementSetAttributeValue has failed", result.rawValue)
        }
    }
}