我的应用当前有一个本地搜索,为搜索结果添加了注释。我想在选择注释并单击"呼叫输出"按钮时进行设置,它将在地图应用程序中打开,并在当前设备位置进行注释。我对此有一些问题。
首先,注释上的我的呼叫按钮没有出现。其次,我认为我无法正确检测到选定的注释。
这是我用于搜索的代码和选定的注释:
func performSearch() {
matchingItems.removeAll()
let request = MKLocalSearchRequest()
request.naturalLanguageQuery = searchText.text
request.region = mapView.region
let search = MKLocalSearch(request: request)
search.startWithCompletionHandler({(response:
MKLocalSearchResponse!,
error: NSError!) in
if error != nil {
println("Error occured in search: (error.localizedDescription)")
} else if response.mapItems.count == 0 {
println("No matches found")
} else {
println("Matches found")
for item in response.mapItems as! [MKMapItem] {
println("Name = (item.name)")
println("Phone = (item.phoneNumber)")
self.matchingItems.append(item as MKMapItem)
println("Matching items = (self.matchingItems.count)")
var annotation = MKPointAnnotation()
var coordinates = annotation.coordinate
annotation.coordinate = item.placemark.coordinate
annotation.title = item.name
self.mapView.addAnnotation(annotation)
}
}
})
}
func mapView(mapView: MKMapView!, annotationView view: MKAnnotationView!,
calloutAccessoryControlTapped control: UIControl!) {
if self.mapView.selectedAnnotations?.count > 0 {
if let selectedLoc = self.mapView.selectedAnnotations[0] as? MKAnnotation {
println("Annotation has been selected")
let currentLoc = MKMapItem.mapItemForCurrentLocation()
let mapItems = NSArray(objects: selectedLoc, currentLoc)
let launchOptions = [MKLaunchOptionsDirectionsModeKey: MKLaunchOptionsDirectionsModeDriving]
MKMapItem.openMapsWithItems([selectedLoc, currentLoc], launchOptions: launchOptions)
}
}
}
任何帮助将不胜感激,谢谢。
对于第一个问题:
需要在viewForAnnotation
委托方法中明确设置呼叫按钮(默认红色引脚没有一个)。这是一个可能实现的简单示例:
func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {
if annotation is MKUserLocation {
return nil
}
let reuseId = "pin"
var pinView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId) as? MKPinAnnotationView
if pinView == nil {
pinView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
pinView!.canShowCallout = true
pinView!.pinColor = .Purple
//next line sets a button for the right side of the callout...
pinView!.rightCalloutAccessoryView = UIButton.buttonWithType(.DetailDisclosure) as! UIButton
}
else {
pinView!.annotation = annotation
}
return pinView
}
对于第二期:
首先,在calloutAccessoryControlTapped
中,使用view.annotation
可以直接访问注释,因此使用selectedAnnotations
阵列不必要。
接下来,openMapsWithItems
期望MKMapItem
对象数组,但是在您传递的数组中([selectedLoc, currentLoc]
),selectedLoc
是 a MKMapItem
-这只是实现MKAnnotation
的某个对象。
运行此代码将导致此错误的崩溃:
- [mkpointannotation dictionaryReSentation]:未识别的选择器已发送到实例
当Maps应用程序尝试使用selectedLoc
时,就好像是MKMapItem
。
相反,您需要从selectedLoc
注释中创建MKMapItem
。这可以通过首先使用MKPlacemark(coordinate:addressDictionary:)
从注释中创建MKPlacemark
,然后使用MKMapItem(placemark:)
从placemark创建MKMapItem
。
示例:
func mapView(mapView: MKMapView!, annotationView view: MKAnnotationView!,
calloutAccessoryControlTapped control: UIControl!) {
let selectedLoc = view.annotation
println("Annotation '(selectedLoc.title!)' has been selected")
let currentLocMapItem = MKMapItem.mapItemForCurrentLocation()
let selectedPlacemark = MKPlacemark(coordinate: selectedLoc.coordinate, addressDictionary: nil)
let selectedMapItem = MKMapItem(placemark: selectedPlacemark)
let mapItems = [selectedMapItem, currentLocMapItem]
let launchOptions = [MKLaunchOptionsDirectionsModeKey: MKLaunchOptionsDirectionsModeDriving]
MKMapItem.openMapsWithItems(mapItems, launchOptions:launchOptions)
}