ios - 将按钮连接到引脚标注

Question

我试图在开车时获取我要搜索的位置，但它给了我这个

Error Message : Thread 1: signal SIGABRT

有人可以帮忙吗？我正在使用 Xcode9 和 Swift4

//Getting direction of location
        func getDirections(){
            if let selectedPin = selectedPin {
                let mapItem = MKMapItem(placemark: selectedPin)
                let launchOptions = [MKLaunchOptionsDirectionsModeKey : MKLaunchOptionsDirectionsModeDriving]
                mapItem.openInMaps(launchOptions: launchOptions)
            }
        }
extension ViewController : MKMapViewDelegate {
    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView?{
        if annotation is MKUserLocation {
            //return nil so map view draws "blue dot" for standard user location
            return nil
        }
        let reuseId = "pin"
        var pinView = mapView.dequeueReusableAnnotationView(withIdentifier: reuseId) as? MKPinAnnotationView
        pinView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
        pinView?.pinTintColor = UIColor.orange
        pinView?.canShowCallout = true
        let smallSquare = CGSize(width: 30, height: 30)
        let button = UIButton(frame: CGRect(origin: CGPoint.zero, size: smallSquare))
        button.setBackgroundImage(UIImage(named: "Car"), for: .normal)
        button.addTarget(self, action: Selector(("getDirections")), for: .touchUpInside)
        pinView?.leftCalloutAccessoryView = button
        return pinView
    }
}

• thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGABRT frame #0: 0x00000001150b9d42 libsystem_kernel.dylib__pthread_kill + 10
frame #1: 0x00000001150f1457 libsystem_pthread.dylibpthread_kill + 90 frame #2: 0x0000000114d790e7 libsystem_c.dylibabort + 127
frame #3: 0x0000000114b0b91f libc++abi.dylibabort_message + 245 frame #4: 0x0000000114b0babb libc++abi.dylibdefault_terminate_handler() + 265
frame #5: 0x000000010f9571be libobjc.A.dylib_objc_terminate() + 97 frame #6: 0x0000000114b27159 libc++abi.dylibstd::__terminate(void (*)()) + 8
frame #7: 0x0000000114b26e0a libc++abi.dylib__cxa_rethrow + 99 frame #8: 0x000000010f9570dc libobjc.A.dylibobjc_exception_rethrow + 40
frame #9: 0x0000000113b00a39 CoreFoundationCFRunLoopRunSpecific + 537 frame #10: 0x00000001155f29c6 GraphicsServicesGSEventRunModal + 62
frame #11: 0x00000001107295e8 UIKitUIApplicationMain + 159
  • frame #12: 0x000000010f038067 Mapmain at AppDelegate.swift:12
frame #13: 0x0000000114ca6d81 libdyld.dylibstart + 1 frame #14: 0x0000000114ca6d81 libdyld.dylib`start + 1 (lldb)

Answer 1

我认为你需要做两个改变

第一次使用

#selector(getDirections)

代替

Selector(("getDirections"))

第二个用于 Swift 4 使用

@objc func getDirections()

代替

func getDirections()