how to use modifying for-loop in Swift 3.2?

Question

I have a converted for-loop in Swift 3.2 that looks similar to this:

for var i in 0..<char.characters.count {
    if(self.characters.count > len  && ((currentIndex + length2323) < length))
    {
      i = i - 1
    }
}

But, It doesn't work properly. I want to continue loop when set value for i is i = i - 1 but this code getting out of loop

And my previous Swift 2 code is :

for(var i = 0 ; i < char.characters.count ; i += 1) {
     if(self.characters.count > len  && ((currentIndex + length2323) < length))
     {
        i = i - 1
     }
}

You can always convert a C-style for loop to a while loop like [this](https://stackoverflow.com/a/42662061/1630618) — vacawama, Jan 31 '18 at 12:04
please try my code bellow, it would be great if you post all your code with cntext and what problem it should solve... — swift2geek, Jan 31 '18 at 12:15
Is `i` used for something that's not included in this code? In the code you've included no variables are modified and `i` is only available inside the loop body (and isn't read or passed anywhere). — David Rönnqvist, Jan 31 '18 at 12:21

swift2geek · Answer 1 · 2018-01-31T12:53:05.210

0

Swift 4 syntax

import UIKit
var char = "char"
var len = 9
var currentIndex = 1
var length2323 = 2323
var length = 17
for var i in 0..<char.count {
if (self.count > len)  && ((currentIndex + length2323) < length) {
    i = i - 1
}

}

Swift 3.2 syntax

import UIKit
var char = "char"
var len = 9
var currentIndex = 1
var length2323 = 2323
var length = 17
for var i in 0..<char.characters.count {
if (self.characters.count > len)  && ((currentIndex + length2323) < length) {
    i = i - 1
}

}

edited Jan 31 '18 at 12:53

answered Jan 31 '18 at 12:14

swift2geek

1,697
1
20
27

2

Why is `i` both the characters and the number inside the loop body? Also, if you define/shadow `i` inside the loop body like that it will be a new value that starts at `0` for each iteration. I don't think that's what the OP is looking for. – David Rönnqvist Jan 31 '18 at 12:18
1

In your for loop you just changed `for var i in 0.. – New-Learner Jan 31 '18 at 12:27
@New-Learner what does you if statement should do? Probably problem in "self". What self object is ? – swift2geek Jan 31 '18 at 12:43
@swift2geek self contain string like ("Peri Peri Sauce Chinese Menu4") – New-Learner Jan 31 '18 at 12:48
@New-Learner ok, than self should be in if statement, i've made some changes – swift2geek Jan 31 '18 at 12:53
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/164261/discussion-between-swift2geek-and-new-learner). – swift2geek Jan 31 '18 at 12:54

score 0 · Answer 2 · answered Jan 31 '18 at 12:48

0

for (index, item) in char.enumerated()
{
      //your loop
}

answered Jan 31 '18 at 12:48

Krishna Kirana

438
4
10

how to use modifying for-loop in Swift 3.2?

2 Answers2