Manipulating strings with Swift

Question

I am trying to divide a String in Swift. I have the following string

Program - /path/to/file.doc

I want to get three informations out of this string Program /path/to/file.doc file.doc

I began with the following solution

var str = "Program - /path/to/file.doc"
let indi = str.rangeOfString("-")?.startIndex 
let subString = str.substringWithRange(Range<String.Index>(start: str.startIndex, end: indi!))
let subString2 = str.substringWithRange(Range<String.Index>(start: indi!, end: str.endIndex))

This gives me the results "Program "and "- /path/to/file.doc"

But how can I get file.doc after the last /?

How Can i increase/decrease and range index to avoid blank spaces?

Unfortunatelly I don't know Swift to answer your question, but In objective-c, I would first get an array from that string using componentsSeparatedByString:@" - ". Then, element 0 is your name and 1 is the path. Use [[NSURL urlWithString:[array lastObject]] lastPathComponent] to get that filename. — sidyll
– sidyll, Commented Sep 8, 2015 at 23:39

yurikoles · Accepted Answer · 2015-09-09 00:21:14Z

2

Yes, sidyll's suggestion is correct, it's a very common practice to get components of Unix path by converting it to NSURL. You may want to write something like this:

var str = "Program - /path/to/file.doc"
if let indi = str.rangeOfString(" - ")?.startIndex {
    let subString = str.substringWithRange(Range<String.Index>(start: str.startIndex, end: indi))
    let subString2 = str.substringWithRange(Range<String.Index>(start: indi, end: str.endIndex))
    let fileName = NSURL(string: subString2).lastPathComponent()
}

I strongly suggest you don't do force unwrap like this. Consider situation if this code will work with string without a particular pattern, for example empty string. Correct, runtime error.

edited Sep 9, 2015 at 0:21

answered Sep 9, 2015 at 0:15

yurikoles

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2 Comments

sidyll Over a year ago

Perfect, thanks for sending this code. And indeed important suggestions regarding the format and safety.

Rob Napier Over a year ago

Minor simplification (from your original code): You don't need Range<String.Index>(start: x, end: y). All of that is equivalent to x..<y.

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