无法在Swift中创建文件的路径

Question

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.

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

剧本:

#!/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？

Answer 1

使用Swift REPL时,NSBundle.mainBundle()路径实际指向:

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

您可能必须使用NSFileManager:

let manager = NSFileManager.defaultManager()

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

注意:您实际上可以自动扩展路径中的波浪号以避免硬编码整个用户的主路径:

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