无法将文件从捆绑包复制到iOS中的文档目录 [英] Can`t copy file from bundle to documents directory in iOS

问题描述

我正在尝试使用以下代码将文件从文件包复制到iOS中的documents目录中。

I am trying to copy a file from my bundle to the documents directory in iOS with the following code.

let bundlePath = NSBundle.mainBundle().pathForResource("information", ofType: ".png")
print(bundlePath, "\n") //prints the correct path
let destPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first!
let fileManager = NSFileManager.defaultManager()
let fullDestPath = NSURL(fileURLWithPath: destPath).URLByAppendingPathComponent("information.png")
let fullDestPathString = String(fullDestPath)
print(fileManager.fileExistsAtPath(bundlePath!)) // prints true

do{
try fileManager.copyItemAtPath(bundlePath!, toPath: fullDestPathString)
}catch{
    print("\n")
    print(error)
}

错误域= NSCocoaErrorDomain代码= 4文件 information.png不存在。 UserInfo = {NSSourceFilePathErrorKey = /用户/ macbookpro / Library / Developer / CoreSimulator / Devices / E58CA1C6-C6F1-4D72-9572-3925675E78A5 / data / Containers / Bundle / Application / EFA83E02-5F24-4BB3-B32A-7E755081A730 / AutoLayout tuts.app /information.png、NSUserStringVariant=（
复制
），NSDestinationFilePath = file：/// Users / macbookpro / Library / Developer / CoreSimulator / Devices / E58CA1C6-C6F1-4D72-9572-3925675E78A5 / data /容器/数据/应用程序/86A1BDD5-FAF2-486E-85A9-CF72A547C6CD/Documents/information.png，NSFilePath = / Users / macbookpro / Library / Developer / CoreSimulator / Devices / E58CA1C6-C6F1-4D72-9572-3925675E78A5 / data / Containers / Bundle / Application / EFA83E02-5F24-4BB3-B32A-7E755081A730 / AutoLayout tuts.app/information.png，NSUnderlyingError=0x7fb53251cd80 {Error Domain = NSPOSIXErrorDomain Code = 2没有这样的文件或目录}}

Error Domain=NSCocoaErrorDomain Code=4 "The file "information.png" doesn’t exist." UserInfo={NSSourceFilePathErrorKey=/Users/macbookpro/Library/Developer/CoreSimulator/Devices/E58CA1C6-C6F1-4D72-9572-3925675E78A5/data/Containers/Bundle/Application/EFA83E02-5F24-4BB3-B32A-7E755081A730/AutoLayout tuts.app/information.png, NSUserStringVariant=( Copy ), NSDestinationFilePath=file:///Users/macbookpro/Library/Developer/CoreSimulator/Devices/E58CA1C6-C6F1-4D72-9572-3925675E78A5/data/Containers/Data/Application/86A1BDD5-FAF2-486E-85A9-CF72A547C6CD/Documents/information.png, NSFilePath=/Users/macbookpro/Library/Developer/CoreSimulator/Devices/E58CA1C6-C6F1-4D72-9572-3925675E78A5/data/Containers/Bundle/Application/EFA83E02-5F24-4BB3-B32A-7E755081A730/AutoLayout tuts.app/information.png, NSUnderlyingError=0x7fb53251cd80 {Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory"}}

根据 fileManager.fileExistsAtPath（），该文件确实存在。我在做什么错了？

According to the fileManager.fileExistsAtPath() the file does indeed exist. What am I doing wrong?

推荐答案

问题是这一行：

let fullDestPathString = String(fullDestPath)

应该是：

let fullDestPathString = fullDestPath.path

查看错误。问题是目的地。注意 file：/// 。您的代码未正确将URL转换为文件路径。您需要使用 NSURL 的 path 属性以字符串形式获取路径。

Look at the error. The problem is the destination. Notice the file:///. Your code is not properly converting the URL to a file path. You need to use the path property of NSURL to get the path as a string.

在所有调试和检查中，您从未验证过 fullDestPathString 的值。

In all of your debugging and checking, you never verified the value of fullDestPathString.

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