How to trim all whitespace and new line characters at end of UITextView's string

Question

I've seen other questions on here on how to remove all whitespace and newline characters using the actual NSString methods, but those affect the beginning of the string, which I do not want.

So let's say for example my user types the following string into my UITextView: H E Y \n \n

There are two spaces after the letter Y followed by a new line character, two more spaces, and lastly another new line character in the above example.

What I would like is for everything after the letter Y to be removed from the UITextView's string.

I'd appreciate any pointers to help me solve this.

- (void)textViewDidEndEditing:(UITextView *)textView
{
     textView.text = [self removeCrapFrom:textView.text];
}

- (NSString *)removeCrapFrom:(NSString *)string
{
    NSUInteger location = 0;
    unichar charBuffer[[string length]];
    [string getCharacters:charBuffer];
    int i = 0;
    for (i = [string length]; i >0; i--)
    {
        if (![[NSCharacterSet whitespaceAndNewlineCharacterSet] characterIsMember:charBuffer[i - 1]])
        {
            break;
        }
    }
    return  [string substringWithRange:NSMakeRange(location, i  - location)];
}

Like I said, they affect the beginning and end, which I DO NOT want — klcjr89, Feb 19 '14 at 02:07
Then why didn't you post an example of a string with whitespace/characters at the beginning? — nhgrif, Feb 19 '14 at 02:08
No, but it vastly improves it because it makes it a million times more clear that the whitespace at the beginning is important to keep. For example, in the link from my possible duplicate comment, the question is identical to yours, but the accepted answer it an NSString method that will trim from both answers. — nhgrif, Feb 19 '14 at 02:10
How didn't it help? I think the downvoters would beg to differ with you. — zeantsoi, Feb 19 '14 at 02:19

score -5 · Accepted Answer · answered Feb 19 '14 at 02:20

-5

You can use:

NSString *newString = [aString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

I tested in Xcode with:

UITextView *textView = [[UITextView alloc] init];
textView.text = @"H E Y \n \n";
textView.text = [textView.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
NSLog(@"textView.text = [%@]",textView.text);

Result is:

textView.text = [H E Y]

answered Feb 19 '14 at 02:20

Duyen LE

22
1

Please read the question and the discussion in the comments. – nhgrif Feb 19 '14 at 02:29

How to trim all whitespace and new line characters at end of UITextView's string

1 Answers1