我已成功将音频文件保存到Parse,但我正在努力再次下载它。我无法通过getDataInBackgroundWithBlock找出块应该是什么。以及如何实际保存文件。任何帮助非常感谢!
let query = PFQuery(className: "wordRecordings")
query.whereKey("wordName", equalTo: "\(joinedWord)")
query.findObjectsInBackgroundWithBlock { (objects:[PFObject]?, error:NSError?) -> Void in
if error == nil{
for object in objects! {
let audioFile = object["audioFile"] as! PFFile
audioFile.getDataInBackgroundWithBlock{ (audioFile: NSData, error:NSError?) -> Void in // THIS BLOCK ISNT CORRECT...
if error == nil {
let audioFile = AudioFile(data: audioFile) // THIS WORKS FOR IMAGES BUT NOT AUDIO - HOW DO I CREATE AN AUDIO FILE
}
}
}
} else {
print("Error: \(error!) \(error!.userInfo)")
}
}
感谢@David,下面是一个带路径代码的工作解决方案。
let fileString = "\(fileName)"
let documentsDirectory = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]
let path = documentsDirectory.URLByAppendingPathComponent(fileString)
audioFile.getDataInBackgroundWithBlock { (audioFile:NSData?, error:NSError?) -> Void in
if error == nil {
audioFile.writeToURL(path, atomically: true)
} else {
print("error with getData")
}
}
答案 0 :(得分:2)
检查官方documentation它应该是这样的(我不会使用Swift所以请耐心等待我):
audioFile.getDataInBackgroundWithBlock{ (audioFile: NSData?, error:NSError?) -> Void in
if error == nil {
let path = "path-to-your-file"
if !audioFile.writeToFile(path, atomically: true){
print("Error saving")
}
}
}
我建议您阅读一些教程(例如here),在那里您可以获得更好的Swift文件处理示例。
显然两个块的参数都必须是可选项(参见here)。您的结果块必须是(audioFile: NSData?, error: NSError?)