How can I stop users from writing curse words in Swift 3?

Question

I'm Using Swift 3 and firebase to create a social app where users can make posts but the thing is that I don't want the users to use curse words.

Is there a way like to replace these words when the users writes them?
Currently the users use a text view to write the things they want to post...

How can I do it in like the easiest and simple way?

I was looking for answers and I find this question Swift: how to censor/filter text entered for swear words, etc?.
With this answer code:

import Foundation

func containsSwearWord(text: String, swearWords: [String]) -> Bool {
return swearWords
    .reduce(false) { $0 || text.contains($1.lowercased()) }
}

// example usage
let listOfSwearWords = ["darn", "crap", "newb"] 
    /* list as lower case */

let userEnteredText1 = "This darn didelo thread is a no no."
let userEnteredText2 = "This fine didelo thread is a go."

print(containsSwearWord(text: userEnteredText1, swearWords: listOfSwearWords)) // true
print(containsSwearWord(text: userEnteredText2, swearWords: listOfSwearWords)) // false

But I don't really get it. How can I implement that in my project? Where should I paste that code? Or how can I link that code to my text view? And what it´s missing on that code to work as it should be?

sergiog90 · Accepted Answer · 2017-05-04T13:09:09.117

If you use UITextField on .editingChanged event.

 inputTextField.addTarget(self, action: #selector(textFieldDidChange(_:)), for: .editingChanged)

 func textFieldDidChange(_ textField: UITextField) {
        print(containsSwearWord(text: textField, swearWords: listOfSwearWords)) // Here you check every text change on input UITextField
}

UPDATE

You must implement UITextViewDelegate (Official Documentation)

Validate before input ends

In textViewShouldEndEditing(_ textView: UITextView) validate user input and return true/false to allow editing end.

Validate after input ends

In textViewDidEndEditing(_ textView: UITextView) validate user input and show any warning if you found not allowed words.

But what happens if I'm using a UITextView? I still don't get it! Thank you. — killerwar557, May 04 '17 at 10:23

score 0 · Answer 2 · edited May 23 '17 at 11:47

This is how I would do it.

Pass TextView text to NSString
Convert NSString to NSArray
Check to see if that NSArray contains one of your curse string. If it does then do replace it with **** or something.

This is how it would look in objective-C.

NSString *textViewStr = myTextView.text;
NSArray *myArray1 = [textViewStr componentsSeparatedByString:@" "]; //this will put all words separated by space into an array
if ( [myArray1 containsObject:@"crap"] ) {
    //found one
    textViewStr = [textViewStr stringByReplacingOccurrencesOfString:@"crap"
                                     withString:@"duck"];
}

while googling I found another better answer.

//If you want multiple string replacement:
NSString *s = @"foo/bar:baz.foo";
NSCharacterSet *doNotWant = [NSCharacterSet characterSetWithCharactersInString:@"/:."];
s = [[s componentsSeparatedByCharactersInSet: doNotWant] componentsJoinedByString: @""];
NSLog(@"%@", s); // => foobarbazfoo

String replacement in Objective-C

How can I stop users from writing curse words in Swift 3?

2 Answers2