Swift split substring based on word wrap - swift

Question

junior developer here. I am currently trying to achieve a substring that is split every n characters of a String.
This is my code for the function
public func split(every: Int) -> [String] {
var result = [String]()
for i in stride(from: 0, to: self.count, by: every) {
let startIndex = self.index(self.startIndex, offsetBy: i)
let endIndex = self.index(startIndex, offsetBy: every, limitedBy: self.endIndex) ?? self.endIndex
result.append(String(self[startIndex..<endIndex]))
}
return result
}
The above code works as expected. But there is one lacking from the code above, which is the word wrapping. Here is the sample String
let itemName = "Japanese Matcha SM w RB -L Special Edition And Americano MS w Brown Sugar Limited Edition"
print(itemName.split(every: 26))
The result will be
["Japanese Matcha SM w RB -L", " Special Edition And Ameri", "cano MS w Brown Sugar Limi", "ted Edition"]
Notice the
[" Special Edition And Ameri"], ["cano MS w Brown Sugar Limi"]
I am trying to figure out how to do the word wrap algorithm based on every n character, but couldn't find any clue.
For example, from above case, how to generate the array becomes,
[" Special Edition And"], ["Americano MS w Brown"], ["Sugar"]
So as you can see, the algorithm might check whether every n characters has a word that is being cut out (dynamic check based on the n characters), hence will move the cut word into the next array.
So in that case, the algorithm will cleverly bypass the every n character, might be less, but not more than n characters, if there is any word not being wrapped.
Is my explanation clear? Can anyone guide me please? Thanks

Answer 1

This is some simple implementation of this algorithm, you can start with that.
First we cut string by words, then add them to temporary string until we meet characters limit.
let itemName = "Japanese Matcha SM w RB -L Special Edition And Americano MS w Brown Sugar Limited Edition"
let table = itemName.split(separator: " ")
let limit = 26
var tempString = ""
var finalResult: [String] = []
for item in table {
tempString += item + " "
if tempString.count >= limit {
finalResult.append(tempString)
tempString = ""
}
}
print(finalResult)

Answer 2

How about this?
extension String {
func split(every: Int) -> [String] {
var result = [String]()
let words = self.split(separator: " ")
var line = String(words.first!)
words.dropFirst().forEach { word in
let word = " " + String(word)
if line.count + word.count <= every {
line.append(word)
} else {
result.append(line)
line = word
}
}
result.append(line)
return result
}
}