How to delete last path component of a String in Swift? - ios

Question

I have a String 11/Passion/01PassionAwakening.mp3 and I need to delete the last path component 01PassionAwakening.mp3 in order to get 11/Passion.
How can I do this while saving both components?

Answer 1

You can separate your url into two parts like so:
let str : NSString = "www.music.com/Passion/PassionAwakening.mp3"
let path : NSString = str.stringByDeletingLastPathComponent
let ext : NSString = str.lastPathComponent
print(path)
print(ext)
Output
www.music.com/Passion
PassionAwakening.mp3
For more info please have a look at this link.

Answer 2

You should really do away with legacy NS Objective-C classes and manual path string splitting where possible. Use URL instead:
let url = URL(fileURLWithPath: "a/b/c.dat", isDirectory: false)
let path = url.deletingLastPathComponent().relativePath // 'a/b'
let file = url.lastPathComponent // 'c.dat'
That being said, Apple has an explicit FilePath type starting with macOS 11, but with no path manipulation methods. For those you'd have to include the external system package
If you are on macOS 12, the methods from the external package are now also available on the system.

Answer 3

Swift 4+:
let components = path.split(separator: "/")
let directory = components.dropLast(1).map(String.init).joined(separator: "/")
Swift 3:
let str = "11/Passion/01PassionAwakening.mp3"
if !str.isEmpty {
let components = str.characters.split("/")
let head = components.dropLast(1).map(String.init).joinWithSeparator("/")
let tail = components.dropFirst(components.count-1).map(String.init)[0]
print("head:",head,"tail:", tail) // head: 11/Passion tail: 01PassionAwakening.mp3
} else {
print("path should not be an empty string!")
}

Answer 4

This works for Swift 3.0 as well:
let fileName = NSString(string: "11/Passion/01PassionAwakening.mp3").lastPathComponent

Answer 5

Swift 3.0 version
if !str.isEmpty {
let components = str.characters.split(separator: "/")
let head = components.dropLast(1).map(String.init).joined(separator: "/")
let words = components.count-1
let tail = components.dropFirst(words).map(String.init)[0]
print("head:",head,"tail:", tail) // head: 11/Passion tail: 01PassionAwakening.mp3
} else {
print("path should not be an empty string!")
}

Answer 6

rolling back to NSString:
extension String {
var ns: NSString {
return self as NSString
}
var pathExtension: String {
return ns.pathExtension
}
var lastPathComponent: String {
return ns.lastPathComponent
}
var stringByDeletingLastPathComponent: String {
return ns.deletingLastPathComponent
}
}
so you can do:
let folderPath = pathString.stringByDeletingLastPathComponent

Answer 7

Just improvised the solution for URL String. Thank you so much ingconti
extension String {
var ns: URL? {
return URL.init(string: self)
}
var pathExtension: String {
return ns?.pathExtension ?? ""
}
var lastPathComponent: String {
return ns?.lastPathComponent ?? ""
}
var stringByDeletingLastPathComponent: String {
return ns?.deletingLastPathComponent().absoluteString ?? ""
}
}