Question

我有一个应用程序，用户按下按钮并拍照，然后该照片进入ImageAnnotation类，并且必须将其添加到地图上，但是出现这样的错误：“在隐式展开可选控件时意外找到”

仅此错误会阻止该应用正常运行，如果您能帮助我，我将非常感谢

这是代码

extension MapViewController: UIImagePickerControllerDelegate, UINavigationControllerDelegate {

func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
    picker.dismiss(animated: true, completion: nil)
}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
    
    picker.dismiss(animated: true, completion: nil)
    
    guard let ecoImage = info[UIImagePickerController.InfoKey.originalImage] as? UIImage else { return }
    
    guard let currentLocation = locationManager.location else { return }

    let pin = ImageAnnotation(coordinate: CLLocationCoordinate2D(latitude: currentLocation.coordinate.latitude, longitude: currentLocation.coordinate.longitude), image: ecoImage, color: UIColor.systemGreen)
}

}

这是必须为地图创建自定义注释的类

class ImageAnnotation : NSObject, MKAnnotation {
var coordinate: CLLocationCoordinate2D
var imageEco: UIImage?
var color: UIColor?
var imageView: UIImageView!

init(coordinate: CLLocationCoordinate2D, image: UIImage, color: UIColor) {
    self.coordinate = coordinate
    imageEco = image
    self.color = color
    imageView.image = image
    imageView.frame = CGRect(x: 0, y: 0, width: 20, height: 20)
    self.imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 20, height: 20))
    imageView.addSubview(self.imageView)

    self.imageView.layer.cornerRadius = 25
    self.imageView.layer.masksToBounds = true
}

}

Here is the final result that must be implemented

Answer 1

您在说imageView.image = image。但是imageView是nil。所以你崩溃了。没什么大惊喜。

从更大的角度看，您似乎无法理解注释和注释视图之间的区别。注释只是消息载体：它可以说出坐标是什么，也许应该显示什么图像，仅此而已。地图视图代表的工作是根据需要创建相应的 annotation视图，而是您要处理 view 的地方，并且可以安排它显示您的圆形图像。

地图上的自定义注释

1 个答案: