如何在按钮上显示图像名称？当我们上传它？

Posted 2023-03-12

【中文标题】如何在按钮上显示图像名称？当我们上传它？

【英文标题】：how I show image name on button ? When we Uploading it?

【发布时间】：2018-03-06 05:35:09

【问题描述】：

我正在通过单击按钮上传图像，我想在同一个按钮上显示图像名称（我用来上传图像）我该怎么办？

    @IBAction func btnChooseImageAction(_ sender: Any) 

    if UIImagePickerController.isSourceTypeAvailable(.savedPhotosAlbum   
        print("Button capture")

        imagePicker.delegate = self
        imagePicker.sourceType = .savedPhotosAlbum;
        imagePicker.allowsEditing = false

        self.present(imagePicker, animated: true, completion: nil)
        
     

【问题讨论】：

检查此链接以使用UIImagePickerController : ***.com/questions/24625687/…

点击此链接从库中获取图像名称：***.com/questions/40627901/…

【参考方案1】：

当您使用 UIImagePickerController 选择图像并上传到服务器时。请按照以下步骤获取文件名

第 1 步。import AssetsLibrary import Photos

第 2 步。确保 Info.plist 中必须包含一个 NSPhotoLibraryUsageDescription 键和一个字符串值，向用户解释应用程序如何使用这些数据。

Step 3. Image Picker Controller 委托方法获取所选图像的信息

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) 
    let url = info[UIImagePickerControllerReferenceURL] as! URL
    let assets = PHAsset.fetchAssets(withALAssetURLs: [url], options: nil)
    let fileName = PHAssetResource.assetResources(for: assets.firstObject!).first!.originalFilename
    print("fileName = \(fileName)")

 dismiss(animated: true, completion: nil)

注意：您可以通过查看文档或谷歌搜索来解决一些警告。 如果这个答案对你有帮助，请投票。

【参考方案2】：

这是在按钮上获取任何图像名称的完整且正确的代码。当我们上传它时。

    @IBAction func btnChooseImageAction(_ sender: Any) 

    let actionSheet = UIAlertController(title: "Choose From", message: "Choose an image from.", preferredStyle: .actionSheet)

    let camera = UIAlertAction(title: "Camera", style: .default)  (UIAlertAction) -> Void in
        print("Clicked on Camera")

        if UIImagePickerController.isSourceTypeAvailable(.camera)
        
            self.picker.sourceType = .camera

            //check device camera front or rear availabilty
            if UIImagePickerController.isCameraDeviceAvailable(.front)
            
                self.picker.cameraDevice = .front
                //cehck for flash
                if UIImagePickerController.isFlashAvailable(for: .front)
                
                    self.picker.cameraFlashMode = .on
                
            
            else
            
                self.picker.cameraDevice = .rear

                if UIImagePickerController.isFlashAvailable(for: .front)
                
                    self.picker.cameraFlashMode = .on
                
            




            //check what you want to capture photo or video
            self.picker.cameraCaptureMode = .photo
            self.picker.allowsEditing = true
            self.present(self.picker, animated: true, completion:  () -> Void in
            )
        
    

    let gallery = UIAlertAction(title: "Gallery", style: .default)  (UIAlertAction) -> Void in

        print("Clicked on Gallery")

        if UIImagePickerController.isSourceTypeAvailable(.photoLibrary)
        
            self.picker.sourceType = .photoLibrary
            self.picker.allowsEditing = true

            self.present(self.picker, animated: true, completion:  () -> Void in

            )
        
    

    let cancel = UIAlertAction(title: "Cancel", style: .cancel)  (UIAlertAction) -> Void in
        print("Clicked on Cancel")
    

    actionSheet.addAction(gallery)
    actionSheet.addAction(camera)
    actionSheet.addAction(cancel)

    self.present(actionSheet, animated: true)  () -> Void in

    


func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any])

    if let image = info[UIImagePickerControllerEditedImage] as? UIImage
    
        imageview.image = image
        let sonu = getFileName(info: info)
        print(sonu)
        if sonu == "JPG"
        
            imageDataForApi = UIImagePNGRepresentation(image)
        
        else if sonu == "PNG"
        
            imageDataForApi = UIImageJPEGRepresentation(image, 0)
        
    
    self.dismiss(animated: true)  () -> Void in

    



func getFileName(info: [String : Any]) -> String 

    if let assetPath = info[UIImagePickerControllerReferenceURL] as? URL 
        let result = PHAsset.fetchAssets(withALAssetURLs: [assetPath], options: nil)
        let asset = result.firstObject
        let fileName = asset?.value(forKey: "filename")
        let fileUrl = URL(string: fileName as! String)
        if let name = fileUrl?.deletingPathExtension().lastPathComponent 
            print(name)


     //let assetPath = info[UIImagePickerControllerReferenceURL] as! NSURL
            if (assetPath.absoluteString.hasSuffix("JPG")) 
                sonu = "JPG"
                print("JPG")
            
            else if (assetPath.absoluteString.hasSuffix("PNG")) 
                sonu = "PNG"
                print("PNG")
            
            else if (assetPath.absoluteString.hasSuffix("GIF")) 
                sonu = "GIF"
                print("GIF")
            
            else 
                sonu = "Unknown"
                print("Unknown")
            

            return name
        
    
    return ""