MapBox iOS不同的标记图像？

有没有办法添加一个ID或东西，我能够设置自定义标记图像？

我有多个标记与数字，我需要每个新的标记有另一个图像。

例如：

marker1 – marker_1_image

marker2 – marker_2_image

Atm我只能设置1个图像（globaly）到所有标记：

func mapView(mapView: MGLMapView, imageForAnnotation annotation: MGLAnnotation) -> MGLAnnotationImage? { var annotationImage = mapView.dequeueReusableAnnotationImageWithIdentifier("place") if annotationImage == nil { var image = UIImage(named: "marker_1")! image = image.imageWithAlignmentRectInsets(UIEdgeInsetsMake(0, 0, image.size.height/2, 0)) annotationImage = MGLAnnotationImage(image: image, reuseIdentifier: "place") } return annotationImage } 

有任何想法吗？ 或者，我可以inheritanceMGLAnnotation并将其用于所有委托方法？

Answer 1

你可以inheritance和添加一个userInfo属性（ 就像在这个答案中一样 ），或者你可以使用现有的title / subtitle属性：

 func mapView(mapView: MGLMapView, imageForAnnotation annotation: MGLAnnotation) -> MGLAnnotationImage? { // get the custom reuse identifier for this annotation let reuseIdentifier = reuseIdentifierForAnnotation(annotation) // try to reuse an existing annotation image, if it exists var annotationImage = mapView.dequeueReusableAnnotationImageWithIdentifier(reuseIdentifier) // if the annotation image hasn't been used yet, initialize it here with the reuse identifier if annotationImage == nil { // lookup the image for this annotation let image = imageForAnnotation(annotation) annotationImage = MGLAnnotationImage(image: image, reuseIdentifier: reuseIdentifier) } return annotationImage } // create a reuse identifier string by concatenating the annotation coordinate, title, subtitle func reuseIdentifierForAnnotation(annotation: MGLAnnotation) -> String { var reuseIdentifier = "\(annotation.coordinate.latitude),\(annotation.coordinate.longitude)" if let title = annotation.title where title != nil { reuseIdentifier += title! } if let subtitle = annotation.subtitle where subtitle != nil { reuseIdentifier += subtitle! } return reuseIdentifier } // lookup the image to load by switching on the annotation's title string func imageForAnnotation(annotation: MGLAnnotation) -> UIImage { var imageName = "" if let title = annotation.title where title != nil { switch title! { case "blah": imageName = "blahImage" default: imageName = "defaultImage" } } // ... etc. return UIImage(named: imageName)! } 

你会想要使图像加载更健壮，并定制重用标识符string的特殊性，但通常这应该工作。

Answer 2

从我最初的答案开始 ，推荐的方法是简单地创build自己的包含所需属性的注释类。

您应该实现MGLAnnotation协议或子类并添加一个userInfo属性。 这两种技术都在官方的例子中得到证实，这里是前者：

定义您的自定义注记类：

 // MGLAnnotation protocol reimplementation class CustomPointAnnotation : NSObject, MGLAnnotation { // As a reimplementation of the MGLAnnotation protocol, we have to add mutable coordinate and (sub)title properties ourselves. var coordinate: CLLocationCoordinate2D var title: String? var subtitle: String? // Custom properties that we will use to customize the annotation's image. var image: UIImage? var reuseIdentifier: String? init(coordinate: CLLocationCoordinate2D, title: String?, subtitle: String?) { self.coordinate = coordinate self.title = title self.subtitle = subtitle } } 

并在你的视图控制器中使用它：

 override func viewDidLoad() { // Do your map loading, remembering to set the map delegate. let point = CustomPointAnnotation(coordinate: CLLocationCoordinate2DMake(0, 0), title: "Custom Point Annotation", subtitle: nil) // Set the custom `image` and `reuseIdentifier` properties, later used in the `mapView:imageForAnnotation:` delegate method. point.reuseIdentifier = "someIdentiferForYourImage" point.image = UIImage(named: "someImage") mapView.addAnnotation(point) } func mapView(mapView: MGLMapView, imageForAnnotation annotation: MGLAnnotation) -> MGLAnnotationImage? { if let point = annotation as? CustomPointAnnotation, image = point.image, reuseIdentifier = point.reuseIdentifier { if let annotationImage = mapView.dequeueReusableAnnotationImageWithIdentifier(reuseIdentifier) { // The annotatation image has already been cached, just reuse it. return annotationImage } else { // Create a new annotation image. return MGLAnnotationImage(image: image, reuseIdentifier: reuseIdentifier) } } // Fallback to the default marker image. return nil } 

Answer 3

 // set different images for multiple pins. func mapView(mapView: MGLMapView, imageForAnnotation annotation: MGLAnnotation) -> MGLAnnotationImage? { var annotationImage : MGLAnnotationImage? = nil //seems to be a double optional! String?? var title = "" var subTitle = "" //-------------------------------------------------- //TITLE //-------------------------------------------------- if let titleOpt = annotation.title{ if let title_ = titleOpt{ title = title_ } } //-------------------------------------------------- //SUBTITLE //-------------------------------------------------- if let subtitleOpt = annotation.subtitle{ if let subtitle_ = subtitleOpt{ subTitle = subtitle_ } } //--------------------------------------------------------------------- if title == "" { }else{ if title == "Assault" { // let imageOut = (title , iconColor: UIColor.appColorFlat_TahitiGold_Orange()) annotationImage = MGLAnnotationImage(image:UIImage(named:"Assault")!, reuseIdentifier: title) } else if title == "Rape" { //let imageOut = self.textToImage(title , iconColor: UIColor.appColorButtonPink()) annotationImage = MGLAnnotationImage(image: UIImage(named:"Rape")!, reuseIdentifier: title) } else if title == "Robbery" { //let imageOut = self.textToImage(title , iconColor: UIColor.appColorButtonPink()) annotationImage = MGLAnnotationImage(image: UIImage(named:"Robbery")!, reuseIdentifier: title) } else if title == "Violet Crime Murder" { //let imageOut = self.textToImage(title , iconColor: UIColor.appColorButtonPink()) annotationImage = MGLAnnotationImage(image: UIImage(named:"Violet Crime Murder")!, reuseIdentifier: title) } else if title == "Poor Roads" { //let imageOut = self.textToImage(title , iconColor: UIColor.appColorButtonPink()) annotationImage = MGLAnnotationImage(image: UIImage(named:"Poor Roads")!, reuseIdentifier: title) } else if title == "Unsafe Neighbourhoods" { //let imageOut = self.textToImage(title , iconColor: UIColor.appColorButtonPink()) annotationImage = MGLAnnotationImage(image: UIImage(named:"Unsafe Neighbourhoods")!, reuseIdentifier: title) } else if title == "Arson" { //let imageOut = self.textToImage(title , iconColor: UIColor.appColorButtonPink()) annotationImage = MGLAnnotationImage(image: UIImage(named:"Arson")!, reuseIdentifier: title) } else if title == "Poor Lighting" { //let imageOut = self.textToImage(title , iconColor: UIColor.appColorButtonPink()) annotationImage = MGLAnnotationImage(image: UIImage(named:"Poor Lighting")!, reuseIdentifier: title) } else{ // let imageOut = self.textToImage(title ,iconColor: UIColor.appColorCYAN()) annotationImage = MGLAnnotationImage(image: UIImage(named:"Default")!, reuseIdentifier: title) } } return annotationImage }