我收到此崩溃错误：
MXNet2CoreML [11383：1168377]
***由于未捕获的异常'NSRangeException'而终止应用程序，原因：
***-[__ NSArray0 objectAtIndex：]：空NSArray的下标0超出范围
***首次抛出调用堆栈：（0x18333f164 0x182588528 0x18329a020 0x1007894bc 0x1011ef94c 0x1011b0420 0x1021412cc 0x10214128c 0x102145ea0 0x1832e7344 0x1832e4f20 0x183204c58 0x1850b0f84 0x18c95d5c4 0x1007d8894 0x182d2456c）
libc ++ abi.dylib：以类型未捕获的异常终止 NSException
这是完整的代码
//Owais: - Map setup
func resetRegion(){
let region = MKCoordinateRegionMakeWithDistance(annotation.coordinate, 5000, 5000)
mapKit.setRegion(region, animated: true)
}
var myLatitude = ""
var myLongitude = ""
// Array of annotations
let annotation = MKPointAnnotation()
var places = PredictionLocationList().place
var locationsArray = [String]()
var ie: Int = 0
@IBOutlet var mapKit: MKMapView!
override func viewDidLoad() {
super.viewDidLoad()
let defaults = UserDefaults.standard
let data = defaults.data(forKey: "selectedimage")
let uiimage2 = UIImage(data: data!)
defaults.synchronize()
let image = uiimage2
// imageView.image = image
predictUsingVision(image: image!)
let swipeDown = UISwipeGestureRecognizer(target: self, action: #selector(respondToSwipeGesture))
swipeDown.direction = UISwipeGestureRecognizerDirection.down
self.view.addGestureRecognizer(swipeDown)
// Do any additional setup after loading the view.
}
@objc func respondToSwipeGesture(gesture: UIGestureRecognizer) {
if let swipeGesture = gesture as? UISwipeGestureRecognizer {
switch swipeGesture.direction {
case UISwipeGestureRecognizerDirection.right:
print("Swiped right")
case UISwipeGestureRecognizerDirection.down:
print("Swiped down")
self.dismiss(animated: true, completion: nil)
case UISwipeGestureRecognizerDirection.left:
print("Swiped left")
case UISwipeGestureRecognizerDirection.up:
print("Swiped up")
default:
break
}
}
}
func predictUsingVision(image: UIImage) {
guard let visionModel = try? VNCoreMLModel(for: model.model) else {
fatalError("Something went wrong")
}
let request = VNCoreMLRequest(model: visionModel) { request, error in
if let observations = request.results as? [VNClassificationObservation] {
let top3 = observations.prefix(through: 2)
.map { ($0.identifier, Double($0.confidence)) }
self.show(results: top3)
}
}
request.imageCropAndScaleOption = .centerCrop
let handler = VNImageRequestHandler(cgImage: image.cgImage!)
try? handler.perform([request])
}
typealias Prediction = (String, Double)
func show(results: [Prediction]) {
var s: [String] = []
for (i, pred) in results.enumerated() {
let latLongArr = pred.0.components(separatedBy: "\t")
print("lat long \(latLongArr)")
myLatitude = latLongArr[1]
myLongitude = latLongArr[2]
ie = i
s.append(String(format: "%d: %@ %@ (%.2f%%)", i + 1, myLatitude, myLongitude, pred.1 * 100))
LocationByCoordinates(latitude: myLatitude, longitude: myLongitude)
// let ew1 = (String(format: "%.2f%", pred.1 * 100))
// print(ew1)
// let double1 = Double(ew1)
// self.doubles.append(double1!)
// print("eueue \(self.doubles)")
// let maxDouble = max(max(double1, double2), double3)
print("first latidue \(myLatitude),,,, \(myLongitude)")
places[i].title = String(i+1)
places[i].coordinate = CLLocationCoordinate2D(latitude: CLLocationDegrees(myLatitude)!, longitude: CLLocationDegrees(myLongitude)!)
}
// predictionLabel.text = s.joined(separator: "\n")
// Map reset
resetRegion()
mapKit.centerCoordinate = places[0].coordinate
// Show annotations for the predictions on the map
mapKit.addAnnotations(places)
// Zoom map to fit all annotations
zoomMapFitAnnotations()
}
func zoomMapFitAnnotations() {
var zoomRect = MKMapRectNull
for annotation in mapKit.annotations {
let annotationPoint = MKMapPointForCoordinate(annotation.coordinate)
let pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0, 0)
if (MKMapRectIsNull(zoomRect)) {
zoomRect = pointRect
} else {
zoomRect = MKMapRectUnion(zoomRect, pointRect)
}
}
self.mapKit.setVisibleMapRect(zoomRect, edgePadding: UIEdgeInsetsMake(50, 50, 50, 50), animated: true)
}
func LocationByCoordinates (latitude: String,longitude:String) {
let mapsKey = UserDefaults.standard.string(forKey: "maps_key") ?? ""
Alamofire.request("https://maps.googleapis.com/maps/api/geocode/json?latlng=\(latitude),\(longitude)&key=\(mapsKey)").responseJSON { response in
if let json = response.result.value {
let request = json as? NSDictionary
if let id = request!["results"] {
// print(id)
let ide = id as? NSArray
let formatted_address = ide![0]
let fors = formatted_address as! NSDictionary
//print(fors.value(forKey: "formatted_address"))
let forss = fors.value(forKey: "formatted_address")
self.locationsArray.append(forss as? String ?? "")
if self.ie == 0 {
self.places[0].identifier = (forss as? String)!
} else if self.ie == 1 {
self.places[1].identifier = (forss as? String)!
} else if self.ie == 2 {
self.places[2].identifier = (forss as? String)!
}
}
}
}
}
}
extension Collection where Indices.Iterator.Element == Index {
subscript (safe index: Index) -> Iterator.Element? {
return indices.contains(index) ? self[index] : nil
}
}
答案 0 :(得分：0)
问题出在这一行let formatted_address = ide![0]
如果数组为空，则[0]不能使它成为第一个元素，因为根本没有元素！
您要做的就是在解开数组之前检查数组是否为空：
if ide!.count > 0 {
//Your code
}
为避免强行展开ide，您可能希望像这样使用可选绑定：
if let id = request!["results"], let ide = id as? NSArray {
let formatted_address = ide[0]
let fors = formatted_address as! NSDictionary
//rest of your code
}