将UIImage视图转换为NSURL并将其上传到Firebase

Question

我试图将图像从图像视图上传到Firebase存储。

用户将从相册或从相机上传图像到图像视图！我想要的是将图像从图像视图上传到Firebase存储。

我试着遵循火力地堡文档的例子如下：

let localFile: NSURL = ImageView.image 


    let metadata = FIRStorageMetadata() 
    metadata.contentType = "image/jpeg" 

    // Upload file and metadata to the object 'images/mountains.jpg' 
    let uploadTask = storage.child("images/DeviceImage.jpg").putFile(localFile, metadata: metadata); 

    // Listen for state changes, errors, and completion of the upload. 
    uploadTask.observeStatus(.Pause) { snapshot in 
     // Upload paused 
    } 

    uploadTask.observeStatus(.Resume) { snapshot in 
     // Upload resumed, also fires when the upload starts 
    } 

    uploadTask.observeStatus(.Progress) { snapshot in 
     // Upload reported progress 
     if let progress = snapshot.progress { 
      let percentComplete = 100.0 * Double(progress.completedUnitCount)/Double(progress.totalUnitCount) 
     } 
    } 

    uploadTask.observeStatus(.Success) { snapshot in 
     // Upload completed successfully 
    } 

    // Errors only occur in the "Failure" case 
    uploadTask.observeStatus(.Failure) { snapshot in 
     guard let storageError = snapshot.error else { return } 
     guard let errorCode = FIRStorageErrorCode(rawValue: storageError.code) else { return } 
     switch errorCode { 
     case .ObjectNotFound: 
      // File doesn't exist 

     case .Unauthorized: 
      // User doesn't have permission to access file 

     case .Cancelled: 
      // User canceled the upload 

      ... 

     case .Unknown: 
      // Unknown error occurred, inspect the server response 
     } 
    } 

但我不知道如何将UIImageView的转换成NSURL。

这是我得到的错误：

Answer 1

你需要将图像转换为磁盘上的文件，并获得该URL上传。

let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) 
let filePath = "\(paths[0])/MyImageName.jpg" 

// Save image. 
UIImageJPEGRepresentation(image, 0.90)?.writeToFile(filePath, atomically: true) 

参见：How do I save a UIImage to a file?

一旦写入磁盘，你可以得到一个URL的文件，像这样：

let localFile = NSURL(fileURLWithPath: filePath)