Question

我尝试在用户执行longPress（使用UILongPressGestureRecognizer）时在地图上添加Pin，但这并不起作用。但是，更大的问题是：地图不再显示。为什么地图消失了？

您找到项目文件here

--------------------------- ViewController.swift ----------------- ---------------

{

import UIKit
import MapKit

class ViewController: UIViewController, MKMapViewDelegate {

@IBOutlet var theMapView: MKMapView!
@IBOutlet var theTextfield: UITextField!

@IBOutlet var theLabel: UILabel!

@IBAction func theButton(sender: UIButton) {
    theLabel.text = "Swift-App schreibt \(theTextfield.text)"
    theTextfield.resignFirstResponder()
}


override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    // Position
    var latitude:CLLocationDegrees = 48.399193
    var longitude:CLLocationDegrees = 9.993341
    // Zoomfaktor
    var latDelta:CLLocationDegrees = 0.01
    var longDelta:CLLocationDegrees = 0.01
    // 
    var theSpan:MKCoordinateSpan = MKCoordinateSpanMake(latDelta,longDelta)



    // Koordinaten der Kirche
    var churchLocation:CLLocationCoordinate2D = CLLocationCoordinate2DMake(latitude, longitude)
    // Zentrum und Kartenausschnitt
    var theRegion:MKCoordinateRegion = MKCoordinateRegionMake(churchLocation, theSpan)


    // LongTap definieren
    let longpress = UILongPressGestureRecognizer(target: theMapView, action: "actionPin:")
    longpress.minimumPressDuration = 1.0
    longpress.numberOfTouchesRequired = 1
    longpress.allowableMovement = 100
    theMapView.addGestureRecognizer(longpress)


    // Karte anzeigen
    theMapView.setRegion(theRegion,animated:false)

    // Pin setzen
    var theUlmMinsterAnnotation = MKPointAnnotation()
    theUlmMinsterAnnotation.coordinate = churchLocation
    theUlmMinsterAnnotation.title = "Ulmer Münster"
    theUlmMinsterAnnotation.subtitle = " Untertitel"

    theMapView.addAnnotation(theUlmMinsterAnnotation)
}

func actionPin(gestureRecognizer:UIGestureRecognizer) {
    var touchpoint = gestureRecognizer.locationInView(self.theMapView)
    var newCoord:CLLocationCoordinate2D=theMapView.convertPoint(touchpoint, toCoordinateFromView: self.theMapView)
    var newAnnotation = MKPointAnnotation()
    newAnnotation.coordinate = newCoord
    newAnnotation.title = "Fingertipp"
    newAnnotation.subtitle = "Untertitel"
    theMapView.addAnnotation(newAnnotation)
}

}}

Answer 1

因为您的地图尺寸为{0,0}并且您没有使用任何约束。

在此处检查项目，并进行较小的更新https://dl.dropboxusercontent.com/u/19438780/test1-v2.zip

如果我添加GestureRecognizer，MapView将不再起作用

1 个答案: