似乎我的文本文件没有永久存储在文档目录中

Question

注意：可能已解决：缺少“.path!”到 documentsUrl.path!.stringByAppendingPathComponent(path)

我正在将文本文件保存到应用程序文档目录。使用

var path = ""
let date = NSDate()
let file = "\(date).txt"
let joined = "\n".join(ActionArray)
if let dirs : [String] = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.AllDomainsMask, true) as? [String] {
    let dir = dirs[0]
    path = dir.stringByAppendingPathComponent(file);
    println(path)

    joined.writeToFile(path, atomically: false, encoding: NSUTF8StringEncoding, error: nil);
}

println path

/Users/dustin/Library/Developer/CoreSimulator/Devices/5EA056FC-114D-4C98-9B35-29B46760BE3A/data/Containers/Data/Application/2AB9FD4A-25AB-4385-9CFB-A66AEFA8C1A3/Documents/2015-05-16 08:24:08 +0000.txt

然后将path和一些其他数据存储到一个Entity中，用于稍后回调文本文件。

当我对实体执行 fetchRequest 并打印出数组时，我得到

( " (entity: Entity; id: 0xd000000000040000 ; data: {\n date = \"2015-05-16 08:18:20 +0000\";\n path = \"/Users/dustin/Library/Developer/CoreSimulator/Devices/5EA056FC-114D-4C98-9B35-29B46760BE3A/data/Containers/Data/Application/4A9C17AB-57C1-47CB-B9B1-E0E5CA494B4E/Documents/2015-05-16 08:24:08\";\n})" )

path 现在缺少“+0000”。当我从 Entity.path 调用路径时，找到了我的文本文件...但是当我完全关闭应用程序 (home-swipe-^) 时，文本文件搜索...

let fileContent = String(contentsOfFile: path, encoding: NSUTF8StringEncoding, error: nil)!
var fileContentArr = split(fileContent) {[=11=] == "\n"}

我明白了

fatal error: unexpectedly found nil while unwrapping an Optional value

无论应用程序是否重置，编写一个持久性文本文件供以后使用我做错了什么？

编辑：我听取了注意应用程序会话之间目录路径变化的建议，因此我将文件名存储到 Entity 并在读取时获取文档路径。我仍然遇到错误。

我正在调试，我的 println 如下

let documentsUrl =  NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0] as! NSURL

    // now lets get the directory contents (including folders)
    if let directoryContents =  NSFileManager.defaultManager().contentsOfDirectoryAtPath(documentsUrl.path!, error: nil) {
        println(directoryContents)
        println(documentsUrl.path!)
    }

[2015-05-17 04:25:48 +0000.txt, 2015-05-17 04:31:07 +0000.txt, iPro_Poker_HH_swift.sqlite, iPro_Poker_HH_swift.sqlite-shm, iPro_Poker_HH_swift.sqlite-wal]

/Users/dustindobrilovic/Library/Developer/CoreSimulator/Devices/5EA056FC-114D-4C98-9B35-29B46760BE3A/data/Containers/Data/Application/7CD25462-947C-40AA-97DB-4A845FED1451/Documents

我的实体获取数组 println()

( " (entity: Hand; id: 0xd000000000080000 ; data: {\n path = \"2015-05-17 04:31:07 +0000.txt\";\n})" )

然后我将 documentsUrl.path! 与实体中的 path 结合起来得到 println(stringDocumentsURL)

file:/Users/dustindobrilovic/Library/Developer/CoreSimulator/Devices/5EA056FC-114D-4C98-9B35-29B46760BE3A/data/Containers/Data/Application/7CD25462-947C-40AA-97DB-4A845FED1451/Documents/2015-05-17 04:31:07 +0000.txt

这是我在下一行收到警告的地方。

let fileContent = String(contentsOfFile: stringDocumentsURL, encoding: NSUTF8StringEncoding, error: nil)!

fatal error: unexpectedly found nil while unwrapping an Optional value

>

Answer 1

路径随发布而变化。尝试仅保留路径的相对部分并在访问之前重建绝对路径。

似乎我的文本文件没有永久存储在文档目录中

Seems like my Text file isn't storing persistently in Documents Directory

ios

swift

nsdate

nsdocumentdirectory

注意：可能已解决：缺少“.path!”到 documentsUrl.path!.stringByAppendingPathComponent(path)