无法将数据和触发函数从ViewController传递到由xib制成的自定义UIView

编程问答 2022-06-05

问题描述

我在iOS编程方面还是一个新手，所以请您原谅。我在这里和那里进行了搜索，但无法找到以下解决方案。我有一个ViewController，在这种情况下为ThirdViewController，从这里我需要通过委托将坐标发送到名为MapWeatherView的自定义视图，但是我似乎无法触发自定义视图中的函数来更新UI中的值。我知道我可以将这些值传递给@IBOutlet weak var mapWeatherView: MapWeatherView!，但是我应该通过委托来实现。我应该在自定义视图中设置类似delegate = self的内容，但我不知道那样做，而且我也做不到。这是View Controller和自定义视图的代码。

第三视图控制器类（我必须从这里发送坐标）

import UIKit
import MapKit
import CoreLocation

protocol MapViewControllerDelegate {
    func mapViewController(latitude: String,longitude: String)
}

class ThirdViewController: UIViewController,MKMapViewDelegate {
    
    var currentPinLocation: CLLocationCoordinate2D? = nil
    
    
    @IBOutlet weak var mMapView: MKMapView!
    @IBOutlet weak var togglePinMode: UISwitch!
    
    // IBOUTLET FOR THE CUSTOM VIEW
    @IBOutlet weak var mapWeatherView: MapWeatherView!
    
    
    fileprivate let locationManager: CLLocationManager = CLLocationManager()
    var delegate: MapViewControllerDelegate?
    
    // SETTING THE DELEGATE FOR THE CUSTOM VIEW??? THE ONE ABOVE IS FOR ANOTHER VIEW CONTROLLER
    var mapWeatherDelegate: MapWeatherViewDelegate?
    
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        togglePinMode.seton(false,animated: false)
        locationManager.requestWhenInUseAuthorization()
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.distanceFilter = kCLdistanceFilterNone
        locationManager.startUpdatingLocation()
        mMapView.showsUserLocation = true
        
        
        let longPress = UILongPressGestureRecognizer(target: self,action: #selector(ThirdViewController.excecutedLongPress(_:)))
        longPress.minimumPressDuration = 1.5
        mMapView.addGestureRecognizer(longPress)
        
    }
    
    override func viewDidAppear(_ animated: Bool) {
        updateWeatherView()
        centerOnTarget(mMapView.userLocation.coordinate)
        
    }
    
    func centerOnTarget(_ target: CLLocationCoordinate2D) {
        
        let center = CLLocationCoordinate2D(latitude: target.latitude,longitude: target.longitude)
        let region = MKCoordinateRegion(center: center,span: MKCoordinateSpan(latitudeDelta: 0.11,longitudeDelta: 0.11))
        
        mMapView.setRegion(region,animated: false)
    }
    
    @objc func excecutedLongPress(_ recognizer: UIGestureRecognizer) {
        if !togglePinMode.isOn {
            
            return
        }
        let prevIoUsPin = mMapView.annotations.filter({!($0 is MKUserLocation)})
        mMapView.removeAnnotations(prevIoUsPin)

        let pressLocation = recognizer.location(in: self.mMapView)
        let pressCoordinates : CLLocationCoordinate2D = mMapView.convert(pressLocation,toCoordinateFrom: self.mMapView)
        
        let newPin = MKPointAnnotation()
        newPin.coordinate = pressCoordinates
        
        currentPinLocation = pressCoordinates
        mMapView.addAnnotation(newPin)
        
        // THIS SHOULD PASS DATA AND TRIGGER FUNCTION IN MapWeatherView (custom UIView)
        mapWeatherDelegate?.updateMapWeatherView(coordinates: currentPinLocation!)
        
        newPin.title = String(pressCoordinates.latitude) + "\n" + String(pressCoordinates.longitude)
        
    }
    
    func updateWeatherView() {
        delegate?.mapViewController(latitude: String(mMapView.userLocation.coordinate.latitude),longitude: String(mMapView.userLocation.coordinate.longitude))
    }
    
    @IBAction func changetoPinMode(_ sender: UISwitch) {
        if !togglePinMode.isOn {
            centerOnTarget(mMapView.userLocation.coordinate)
            mMapView.showsUserLocation = true
            for annotation in mMapView.annotations {
                mMapView.view(for: annotation)?.isHidden = true
            }

        } else {
            if currentPinLocation == nil {
                currentPinLocation = mMapView.userLocation.coordinate
            }
            mMapView.showsUserLocation = false
            for annotation in mMapView.annotations {
                mMapView.view(for: annotation)?.isHidden = false
            }
            centerOnTarget(currentPinLocation!)
        }
    }
}

自定义视图（我需要使用上面的ThirdViewController的坐标通过委托在这里触发函数）

import UIKit
import MapKit


// PROTOCOL FOR DELEGATE
protocol MapWeatherViewDelegate {
    func updateMapWeatherView(coordinates: CLLocationCoordinate2D)
}

class MapWeatherView: UIView,MapWeatherViewDelegate {
    
    // THIS IS THE FUNCTION THAT NEEDS TO BE TRIGGERED VIA DELEGATE
    func updateMapWeatherView(coordinates: CLLocationCoordinate2D) {
        print("Received latitude: \(coordinates.latitude) and longitude: \(coordinates.longitude) !!!")
    }
    
    var delegate: MapWeatherViewDelegate?
    
    
    let nibName = "MapWeatherView"
    var contentView: UIView?
    @IBOutlet weak var mapLatLabel: UILabel!
    @IBOutlet weak var mapLonLabel: UILabel!
    @IBOutlet weak var mapWeatherIcon: UIImageView!
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        commonInit()
        
    }
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        commonInit()
    
    }
    
    func commonInit() {
        guard let view = loadViewFromNib() else { return }
        view.frame = self.bounds
        self.addSubview(view)
        contentView = view

    }
    
    func loadViewFromNib() -> UIView? {
        let bundle = Bundle(for: type(of: self))
        let nib = UINib(nibName: nibName,bundle: bundle)
        
        return nib.instantiate(withOwner: self,options: nil).first as? UIView
    }
}

这也是我的故事板中的一个屏幕，也许可以更好地说明结构：

enter image description here

任何帮助将不胜感激！请询问您是否需要任何澄清，并在此先感谢您的帮助！

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

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