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我实际上是 Swift 开发人员，主要侧重于 UIKit，而不是 AppKit 或 Cocoa。所以 Xcode 告诉我 NSSearchField.stringValue？也不是 NSSearchField.text？正在工作，这是真的吗？如果是这样，我应该改用什么？

extension MapViewController: NSSearchFieldDelegate {
        override func searchFieldAction(sender: NSSearchField) 
            defer {
            }

            guard let text = NSSearchField.stringValue?.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())
                where !text.isEmpty else { return }

            let request = MKLocalSearchRequest()
            request.naturalLanguageQuery = text
            request.region = mapView.region

            let search = MKLocalSearch(request: request)
            search.startWithCompletionHandler { (response, error) in
                guard let item = response?.mapItems.first else { return }

                let annotation = item.placemark
                self.mapView.addAnnotation(annotation)
                self.mapView.showAnnotations([annotation], animated: true)
                self.mapView.selectAnnotation(annotation, animated: true)
            }
        }
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1 回答 1

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NSSearchField是类。sender是 的一个实例。NSSearchField

你想使用类的实例sender.stringValue

于 2016-07-25T12:14:55.547 回答