无法在Swift中建立文件的路径 [英] Can not make path to the file in Swift

问题描述

我尝试在Swift中打开文件.为此，我创建了文件路径.它不起作用.

I try to open the file in Swift. For it I create the file path. It doesn't work.

maaaacy:~ $ pwd
/Users/tsypa
maaaacy:~ $ cat a.txt
test
maaaacy:~ $ ./a.swift 
nil!
maaaacy:~ $ 

脚本:

#!/usr/bin/xcrun swift 

import Foundation

var filePath = NSBundle.mainBundle().pathForResource("a", ofType: "txt", inDirectory: "/Users/tsypa")
if let file = filePath {
        println("file path \(file)")
        // reading content of the file will be here
} else {
        println("nil!")
}

怎么了?

推荐答案

在使用Swift REPL时，NSBundle.mainBundle()的路径实际上指向:

When using Swift REPL, the NSBundle.mainBundle()'s path actually points to:

/Applications/Xcode6-Beta6.app/Contents/SharedFrameworks/LLDB.framework/Versions/A/Resources

您可能必须使用 NSFileManager 代替:

You may have to use NSFileManager instead:

let manager = NSFileManager.defaultManager()

if manager.fileExistsAtPath("/Users/tsypa/a.txt") {
    // file exists, read
} else {
    // file doesn't exist
}

---

注意:实际上，您可以自动在路径中扩展代字号，以避免对完整的用户主路径进行硬编码:

---

Note: You can actually automatically expand tilde in the path to avoid hardcoding the full user's home path:

"~/a.txt".stringByExpandingTildeInPath // prints /Users/<your user>/a.txt

这篇关于无法在Swift中建立文件的路径的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！