How can I read a text file with 2 columns in Swift? - swift

Question

I have 2 problems:
I need to open the text file
I need to read in data (organized as 2 columns) and store into either 2 arrays or a multi-dimensional array. The 2 columns are numeric x-y pairs (see below for screenshot of the data), so whatever is easier will work for me, I just need to make sure that the first x-value corresponds to the first y-value.
My attempt:
I tried using this code that I found on this website, but it's giving me errors that I can't figure out:
let path:String = Bundle.mainBundle().pathForResource("README", ofType: "txt")!
textView.text = String(contentsOfFile: path,
encoding: NSUTF8StringEncoding,
error: nil)
Errors for the code for the first problem:
Cannot call value of non-function type 'Bundle'
Use of unresolved identifier 'textView'

Answer 1

For the first problem this works:
let url = Bundle.main.url(forResource: "myResource", withExtension: "txt")
let text = try? String(contentsOf: url!)
print(text ?? "")
for the unresolved identifier part make sure the definition of textView is correct and the source code has your application as its target
for your second problem:
let's say we have these three lines in our text file:
first-one\n
second-two\n
third-three
var pairs = [(Double,Double)]()
for line in (text?.components(separatedBy: "\n").dropFirst())!{
if line != "" {
let sep = # separator is here
let words = line.components(separatedBy: sep)
pairs.append((Double(words[0])!,Double(words[1])!))
}
}
// for reading of the values
for pair in pairs{
print(pair) // equivalent to : (pair.0,pair.1)
}