Firebase上传文件获取可选字符串的文件名 [英] Firebase uploading file getting optional string in filename

问题描述

上传图片时，我正在实施Firebase友好的聊天示例。获得可选字符串的响应。什么是错过的？

 可选（FIRStorageMetadata 0x7fc84aced790：{
 bucket =abc.appspot.com; 
 contentEncoding = identity; 
 contentType =image / jpeg; 
 downloadTokens =abctoken; 
 generation = 1231231; 
 metageneration = 1; 
 name = 可选（\S5CKnKUykANdxSvZ3wujpMXHTvg1\）/ 494509700277 / asset.JPG; 
 timeCreated =2016-09-02T11：49：00.114Z; 
 updated =2016-09-02T11 ：49：00.114Z; 
}）
  

我的代码：

  let filePath =（FIRAuth.auth（）!. currentUser！.uid）/（IntDNSDate.time IntervalSinceReferen ceDate 1000））/（referenceUrl.lastPathComponent！）
  

在样本中使用可选值（？）所以我把它转换（！）

解决方案

在swift中，你必须强制展开值来避免这个（但是确保它不是零）。

\（optionalVa ）

或以标准方式解开它

  if let value = optionalValue {
 someFIRMethod（\（value））
} 
  

I was implementing Firebase friendly chat sample while uploading image. Getting response with optional string. what is missed?

Optional(FIRStorageMetadata 0x7fc84aced790: {
    bucket = "abc.appspot.com";
    contentEncoding = identity;
    contentType = "image/jpeg";
    downloadTokens = "abctoken";
    generation = 1231231;
    metageneration = 1;
    name = "Optional(\"S5CKnKUykANdxSvZ3wujpMXHTvg1\")/494509700277/asset.JPG";
    timeCreated = "2016-09-02T11:49:00.114Z";
    updated = "2016-09-02T11:49:00.114Z";
})

My code:

 let filePath = "(FIRAuth.auth()!.currentUser!.uid)/(Int(NSDate.time‌​IntervalSinceReferen‌​ceDate() * 1000))/(referenceUrl.lastPathComponent!)"

was written with optional value (?) in sample so i convert it (!)

解决方案

In swift you must force unwrap value to avoid this (but make sure, it's not nil).

"\(optionalValue!)"

Or unwrap it in standard way

if let value = optionalValue {
    someFIRMethod("\(value)")
}

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