我尝试向导航 Controller 导航栏添加左按钮,但出现错误:
Cannot convert value of type 'NSObject -> () -> LocationViewController' to expected argument type 'AnyObject?'.
我浏览了其他SO问题,他们大部分都说要设置一个像这样的导航栏按钮。非常感谢任何帮助。
var leftAddBarButtonItem : UIBarButtonItem = UIBarButtonItem(title: "Cancel", style: .Plain, target: self, action: #selector(cancelButtonTapped))
我的行动:
func cancelButtonTapped(sender:UIButton) {
self.dismissViewControllerAnimated(true, completion: nil)
}
编辑: FullView Controller 代码
import UIKit
import MapKit
protocol HandleMapSearch {
func dropPinZoomIn(placemark:MKPlacemark)
}
class LocationViewController: UIViewController {
let locationManager = CLLocationManager()
var resultSearchController:UISearchController? = nil
var selectedPin:MKPlacemark? = nil
var leftAddBarButtonItem : UIBarButtonItem = UIBarButtonItem(title: "Cancel", style: UIBarButtonItemStyle.Plain, target: self, action: "cancelButtonTapped")
func cancelButtonTapped(sender:UIButton) {
self.dismissViewControllerAnimated(true, completion: nil)
}
func setLocation() {
if let selectedPin = selectedPin {
let mapItem = MKMapItem(placemark: selectedPin)
let launchOptions = [MKLaunchOptionsDirectionsModeKey : MKLaunchOptionsDirectionsModeDriving]
mapItem.openInMapsWithLaunchOptions(launchOptions)
}
}
@IBOutlet weak var mapView: MKMapView!
override func viewDidLoad() {
super.viewDidLoad()
self.navigationController?.navigationItem.setLeftBarButtonItem(leftAddBarButtonItem, animated: true)
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestWhenInUseAuthorization()
locationManager.requestLocation()
let locationSearchTable = storyboard!.instantiateViewControllerWithIdentifier("LocationSearchTableViewController") as! LocationSearchTableViewController
resultSearchController = UISearchController(searchResultsController: locationSearchTable)
resultSearchController?.searchResultsUpdater = locationSearchTable
let searchBar = resultSearchController!.searchBar
searchBar.sizeToFit()
searchBar.placeholder = "Search or Drop a Pin"
navigationItem.titleView = resultSearchController?.searchBar
resultSearchController?.hidesNavigationBarDuringPresentation = false
resultSearchController?.dimsBackgroundDuringPresentation = true
definesPresentationContext = true
locationSearchTable.mapView = mapView
locationSearchTable.handleMapSearchDelegate = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
extension LocationViewController : CLLocationManagerDelegate {
func locationManager(manager: CLLocationManager, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
if status == .AuthorizedWhenInUse {
locationManager.requestLocation()
}
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
if let location = locations.first {
let span = MKCoordinateSpanMake(0.01, 0.01)
let region = MKCoordinateRegion(center: location.coordinate, span: span)
mapView.setRegion(region, animated: true)
}
}
func locationManager(manager: CLLocationManager, didFailWithError error: NSError) {
print("error:: \(error)")
}
}
extension LocationViewController: HandleMapSearch {
func dropPinZoomIn(placemark:MKPlacemark){
// cache the pin
selectedPin = placemark
// clear existing pins
mapView.removeAnnotations(mapView.annotations)
let annotation = MKPointAnnotation()
annotation.coordinate = placemark.coordinate
annotation.title = placemark.name
if let city = placemark.locality,
let state = placemark.administrativeArea {
annotation.subtitle = "\(city) \(state)"
}
mapView.addAnnotation(annotation)
let span = MKCoordinateSpanMake(0.01, 0.01)
let region = MKCoordinateRegionMake(placemark.coordinate, span)
mapView.setRegion(region, animated: true)
}
}
extension LocationViewController : MKMapViewDelegate {
func mapView(mapView: MKMapView, viewForAnnotation 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.dequeueReusableAnnotationViewWithIdentifier(reuseId) as? MKPinAnnotationView
pinView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
pinView?.pinTintColor = UIColor.orangeColor()
pinView?.canShowCallout = true
let smallSquare = CGSize(width: 60, height: 60)
let button = UIButton(frame: CGRect(origin: CGPointZero, size: smallSquare))
button.setBackgroundImage(UIImage(named: "PinButton2.jpg"), forState: .Normal)
button.addTarget(self, action: #selector(LocationViewController.setLocation), forControlEvents: .TouchUpInside)
pinView?.leftCalloutAccessoryView = button
return pinView
}
}
最佳答案
我想说有一个错误..看起来你在任何函数旁边设置了 var leftAddBarButtonItem ...
行...将其设置在 viewDidLoad
中,然后它应该是工作。
如果您使用的是 swift 2.2,那么您的操作应该是 #selector(cancelButtonTapped(_:))
否则只需使用“cancelButtonTapped:”...
关于ios - 设置导航栏按钮的目标,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/36995594/