Question

我正在使用Swift 3构建一个APP并且无后端，我无法从我的APP上传图像（用户将从相机或照片库中拍摄照片）到后端。 APP正在将图像保存到photoLibrary：

func savePic() {
    let imageData = UIImageJPEGRepresentation(itemPic.image!, 0.5);
    let compressedJPEGImage = UIImage(data: imageData!);
    UIImageWriteToSavedPhotosAlbum(compressedJPEGImage!, nil, nil, nil);

}

拍摄的图像地址是什么？

我如何将其上传到backEndLess？

Answer 1

您应该使用Backendless.file.upload方法。

例如：

func uploadImage(_ img:UIImage){
    //convert UIImage to jpg Data with 0.5 compressionQuality (use 1 for full quality)
    let jpg=UIImageJPEGRepresentation(img, 0.5);
    //saving file name with current timestamp
    let fileName="IMG_\(Date().timeIntervalSince1970).jpg";
    //uploading image asynchronously 
    Backendless.sharedInstance().file.upload("imagesFolder/\(fileName)", content:jpg, response: {(res) in
        //uploading image finished
    }, error: {(e) in
        //failed to upload
        print("error code: \(e!.faultCode)");
    })
}

如果您需要以PNG格式上传，请使用UIImagePNGRepresentation代替IImageJPEGRepresentation

要上传用户从已保存的相册中直接拍摄的图像或通过相机拍摄，您可以这样做：

使用UINavigationControllerDelegate＆amp; UIImagePickerControllerDelegate
指定要使用的UIImagePickerControllerSourceType，例如：.photoLibrary，.camera或.savedPhotosAlbum
在用户didFinishPickingMediaWithInfo

这是一个例子：

class MyViewController : UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate{

var imgPicker = UIImagePickerController();

var backendless = Backendless.sharedInstance();

override func viewDidLoad() {
    imgPicker.delegate = self;
}

@IBAction func imgFromCamera(_ btn:UIButton){
    imgPicker.sourceType = .camera;//image picker with camera
    show(imgPicker, sender: self);//open image picker
}

@IBAction func imgFromSavedPhotos(_ btn:UIButton){
    imgPicker.sourceType = .savedPhotosAlbum;//image picker from saved photos
    show(imgPicker, sender: self);//open image picker
}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    let img = info[UIImagePickerControllerOriginalImage] as! UIImage;
    uploadImage(img);
    dismiss(animated: true, completion: nil);
}

func uploadImage(_ img:UIImage){
    let jpg=UIImageJPEGRepresentation(img, 1);//full scale JPG
    //let png=UIImagePNGRepresentation(img);//full scale PNG
    let fileName="IMG_\(Date().timeIntervalSince1970).jpg";
    //upload img
    Backendless.sharedInstance().file.upload("imagesFolder/\(fileName)", content:jpg, response: {(res) in
     //successfully uploaded
    }, error: {(e) in
        //failed to upload
    })
}

func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
    dismiss(animated: false, completion: {
        print("user didn't pick any image");
    });
}
}

另请注意，要使用您应声明的内容：NSPhotoLibraryUsageDescription＆amp;您Info.plist中的NSCameraUsageDescription，否则会在iOS 10中崩溃，如链接参考中所述。

这是一个例子：

<key>NSPhotoLibraryUsageDescription</key>
<string>Your explanation here</string>
<key>NSCameraUsageDescription</key>
<string>Your explanation here</string>

Swift 3和后端 - 我如何上传图像？

1 个答案: