Question

我在optionViewController上尝试了这个：

protocol OptionControllerDelegate: NSObjectProtocol {
    func changeMapDisplayMode(controller: OptionController)
}
class OptionController: UIViewController {

    weak var delegate: OptionControllerDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    @IBAction func changeMapType(sender: AnyObject) {
        delegate?.changeMapDisplayMode(self)

    }
}

，这在traceViewController中：

class TraceController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate, OptionControllerDelegate {

    @IBOutlet weak var mapKit: MKMapView!
    var locationManager: CLLocationManager!
    var location: CLLocation!

    override func viewDidLoad() {
        super.viewDidLoad()
        mapKit.setUserTrackingMode(.Follow, animated: true)
        mapKit.delegate = self

        let optionController = OptionController()
        optionController.delegate = self

        if (CLLocationManager.locationServicesEnabled()) {
            locationManager = CLLocationManager()
            locationManager.delegate = self
            locationManager.desiredAccuracy = kCLLocationAccuracyBest
            locationManager.requestAlwaysAuthorization()
            locationManager.startUpdatingLocation()
        }
    }
    func changeMapDisplayMode(controller: OptionController) {
        print("bonjour")

        let actionSheet = UIAlertController(title: "Map Types", message: "Select map type:", preferredStyle: UIAlertControllerStyle.ActionSheet)

        let normalMapTypeAction = UIAlertAction(title: "Normal", style: UIAlertActionStyle.Default) { (alertAction) -> Void in
            //self.viewMap.mapType = kGMSTypeNormal
            self.mapKit.mapType = .Standard
        }

        let satelliteMapTypeAction = UIAlertAction(title: "Satellite", style: UIAlertActionStyle.Default) { (alertAction) -> Void in
            //self.viewMap.mapType = kGMSTypeTerrain
            self.mapKit.mapType = .Satellite
        }

        let hybridMapTypeAction = UIAlertAction(title: "Hybrid", style: UIAlertActionStyle.Default) { (alertAction) -> Void in
            self.mapKit.mapType = .Hybrid
        }

        let cancelAction = UIAlertAction(title: "Close", style: UIAlertActionStyle.Cancel) { (alertAction) -> Void in

        }

        actionSheet.addAction(normalMapTypeAction)
        actionSheet.addAction(satelliteMapTypeAction)
        actionSheet.addAction(hybridMapTypeAction)
        actionSheet.addAction(cancelAction)

        presentViewController(actionSheet, animated: true, completion: nil)
    }

但它不起作用（＆＃34; bonjour＆＃34;）也没有显示。当我点击changeMapType按钮时，它只是做任何事情...... 你有什么想法吗？：/

Answer 1

在应用程序的不同位置共享视图实例不是一个好习惯。

这里有多种选择。

也许最好的方法是使用允许OptionController向TraceController发送邮件的代理。

将代理人添加到OptionController：

protocol OptionControllerDelegate {
    func changeMapDisplayMode(...) 
}

class OptionController: UIViewController {
    ...
    weak var delegate : OptionControllerDelegate
    ...
}

在TraceController

中实现委托方法

class TraceController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate, OptionControllerDelegate {
    ...
    optionController.delegate = self // Do this on the instance of OptionController
    ...
    func changeMapDisplayMode(...) {
        // Do stuff
    }
    ...
}

在所有项目中使用实例

1 个答案: