Ios 如何删除地图视图上的最后一个注释？

}

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我目前正在使用上面给出的代码在MapView上创建注释。我想删除用户创建的上一个批注。如何使用deleteLast按钮执行此操作？

尝试

注释array.removeLast（）

@KosukeOgawa如何通过按钮执行此操作。我试图将annotationsArray变量设置为全局变量，但注释出现了几次故障。。。还有别的办法吗？

@IBAction func addPin(_ sender: UILongPressGestureRecognizer) {


let location = sender.location(in: self.mapView)
let locCoord = self.mapView.convert(location, toCoordinateFrom: self.mapView)

let annotation = MKPointAnnotation()

annotation.coordinate = locCoord
annotation.title = titleTextField.text

var annotationsArray: [[String:Any]]!
var annotationsData = UserDefaults.standard.data(forKey: "StoredAnnotations")

//If the data is nil, then set the new annotation as the only element in the array
if annotationsData == nil {
annotationsArray = [newAnnotationDict]
} else {
//If it isn't nil, then convert the data into an array of dicts
do {
    //Convert this data into an array of dicts
    annotationsArray = try JSONSerialization.jsonObject(with: annotationsData!, options: []) as! [[String:Any]]
    annotationsArray.append(newAnnotationDict)
} catch {
    print(error.localizedDescription)
}

}

do {

//Use JSONSerialization to convert the annotationsArray into Data
let jsonData = try JSONSerialization.data(withJSONObject: annotationsArray, options: .prettyPrinted)

//Store this data in UserDefaults
UserDefaults.standard.set(jsonData, forKey: "StoredAnnotations")
} catch {
print(error.localizedDescription)
    }
}

 @IBAction func deleteLast(sender: UIButton){