Question

我正在使用Swift 5代码，并且在代码中我必须捕获图像。我的来源类型为.camera或.photoLibrary。我已经完美地设置了所有内容，甚至包括Info.plist中的权限设置，但是由于不明原因，无法使用照片库选择图像。每次都只有相机选项可用。请提出建议并查看我的代码，我在做什么错了？

权限信息列表：

Privacy - Photo Library Additions Usage Description
Privacy - Photo Library Usage Description
Privacy - Media Library Usage Description
Privacy - Camera Usage Description

代码：

var imagePicker: UIImagePickerController!


 enum ImageSource {
        case photoLibrary
        case camera
    }

    //MARK: - Take image
    func takePhoto() {
        guard UIImagePickerController.isSourceTypeAvailable(.camera) else {
            selectImageFrom(.photoLibrary)
            return
        }
        selectImageFrom(.camera)
    }

    func selectImageFrom(_ source: ImageSource){
        imagePicker =  UIImagePickerController()
        imagePicker.delegate = self
        switch source {
        case .camera:
            imagePicker.sourceType = .camera
        case .photoLibrary:
            imagePicker.sourceType = .photoLibrary
        }
        present(imagePicker, animated: true, completion: nil)
    }

Answer 1

您始终会优先保护摄像机

//MARK: - Take image
func takePhotoLib() { 
    guard UIImagePickerController.isSourceTypeAvailable(.photoLibrary) else { 
        return
    }
    selectImageFrom(.photoLibrary)
}

//MARK: - Take image
func takePhotoCamera() {
    guard UIImagePickerController.isSourceTypeAvailable(.camera) else { 
        return
    }
    selectImageFrom(.camera)
}

Answer 2

将参数类型从andThen更改为ImageSource

UIImagePickerController.SourceType

现在应该可以工作。

对不起，您似乎正在检查设备是否有摄像头，然后继续进行选择。显示一个操作表，供用户选择其中之一。会的。

使用此功能：

func selectImageFrom(_ source: UIImagePickerController.SourceType){
        imagePicker =  UIImagePickerController()
        imagePicker.delegate = self
        switch source {
        case .camera:
            imagePicker.sourceType = .camera
        case .photoLibrary:
            imagePicker.sourceType = .photoLibrary
        }
        present(imagePicker, animated: true, completion: nil)
    }

Answer 3

我认为此功能更短，并减少了额外的代码。

func selectImageFrom(_ source: UIImagePickerController.SourceType) {
    guard UIImagePickerController.isSourceTypeAvailable(source) else {
        return
    }
    let imagePicker =  UIImagePickerController()
    imagePicker.delegate = self
    imagePicker.sourceType = source
    present(imagePicker, animated: true, completion: nil)
}

Answer 4

      func selectimage(_ sender: UIButton)
    {
        let alert = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
        alert.addAction(UIAlertAction(title: "Take Photo", style: .default, handler: { _ in
            self.openCamera()
        }))

        alert.addAction(UIAlertAction(title: "Choose Photo", style: .default, handler: { _ in
            self.openGallary()
        }))

        alert.addAction(UIAlertAction.init(title: "Cancel", style: .cancel, handler: nil))

        //If you want work actionsheet on ipad then you have to use popoverPresentationController to present the actionsheet, otherwise app will crash in iPad
        switch UIDevice.current.userInterfaceIdiom {
        case .pad:
            alert.popoverPresentationController?.sourceView = sender
            alert.popoverPresentationController?.sourceRect = sender.bounds
            alert.popoverPresentationController?.permittedArrowDirections = .up
        default:
            break
        }

        self.present(alert, animated: true, completion: nil)
    }


    //MARK: - Open the camera
    func openCamera(){
        if(UIImagePickerController .isSourceTypeAvailable(UIImagePickerControllerSourceType.camera)){
            imagePicker.sourceType = UIImagePickerControllerSourceType.camera

            //If you dont want to edit the photo then you can set allowsEditing to false
            // imagePicker.allowsEditing = true
            imagePicker.delegate = self
            imagePicker.modalPresentationStyle = .overCurrentContext
            self.present(imagePicker, animated: true, completion: nil)


        }
        else{
            let alert  = UIAlertController(title: "Warning", message: "You don't have camera", preferredStyle: .alert)
            alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
            self.present(alert, animated: true, completion: nil)
        }
    }

func openGallary(){
        if(UIImagePickerController .isSourceTypeAvailable(UIImagePickerControllerSourceType.photoLibrary)){
            imagePicker.sourceType = UIImagePickerControllerSourceType.photoLibrary
            self.tabBarController?.tabBar.isHidden = true
            //If you dont want to edit the photo then you can set allowsEditing to false
            // imagePicker.allowsEditing = true
            imagePicker.delegate = self
            imagePicker.modalPresentationStyle = .overCurrentContext
            self.present(imagePicker, animated: true, completion: nil)


        }

仅可使用相机选项快速代码无法访问照片库

4 个答案: