无法将文件从捆绑包复制到iOS中的文档目录

我试图使用以下代码将我的包中的文件复制到iOS中的文档目录.

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 =/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.我究竟做错了什么？

问题是这一行:

let fullDestPathString = String(fullDestPath)

它应该是:

let fullDestPathString = fullDestPath.path

看看错误.问题是目的地.请注意file:///.您的代码未正确将URL转换为文件路径.您需要使用path属性NSURL来将路径作为字符串.

在所有调试和检查中,您从未验证过的值fullDestPathString.