How to identify and remove newline and white spaces?

Question

I am making an nsmutable array by separating a string by component it is causing a lot of new line and white spaces to be inserted in the array how to identify and remove them?

for (int i=0;i<contentsOfFile.count; i++) 
 {
        if(!([[contentsOfFile objectAtIndex:i]isEqual:@"\n"]||[[contentsOfFile     objectAtIndex:i]isEqual:@""]))
       [arrayToBereturned addObject:[contentsOfFile objectAtIndex:i]];
 }

this code which i am using cannot identify all new line charectors thanks

i added an extra condition to check for \r\n it worked – amar May 03 '12 at 07:04 — amar, May 03 '12 at 07:04

score 21 · Answer 1 · answered May 03 '12 at 06:35

21

To remove all extra space and \n from your string-

NSString* result = [yourString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

than prepare your contentsOfFile Array.

answered May 03 '12 at 06:35

Naina Soni

720
5
21

1

-stringByTrimmingCharatersInSet only trims characters from the beginning and end of the string, use with caution. – SeniorShizzle Nov 22 '15 at 02:55

score 12 · Accepted Answer · answered May 03 '12 at 06:34

12

If you want an array without whitespace:

NSString *string = @"Hello, World!";
NSCharacterSet *separator = [NSCharacterSet whitespaceAndNewlineCharacterSet];
NSArray *stringComponents = [string componentsSeparatedByCharactersInSet:separator];

answered May 03 '12 at 06:34

Espresso

4,722
1
24
33

Yunus Nedim Mehel · Answer 3 · 2015-10-26T10:26:54.157

10

stringByTrimmingCharachersInSet: only removes desired characters from the end and the beginning of the string. To remove all occurences you should use stringByReplacingOccurrencesOfString:

edited Oct 26 '15 at 10:26

answered Sep 17 '12 at 12:19

Yunus Nedim Mehel

12,089
4
50
56

score 0 · Answer 4 · answered Jan 16 '20 at 12:23

Swift 5 version

    let string = "Hello, stack overflow!"
    let components = string.components(separatedBy: .whitespacesAndNewlines)
    print(components) // prints ["Hello,", "stack", "overflow!"]

Also regarding string.replacingOccurrences

    let string = " Hello, stack overflow     ! "
    let noSpacingsString = string.replacingOccurrences(of: " ", with: "")
    print(components) // prints "Hello,stackoverflow!"

How to identify and remove newline and white spaces?

4 Answers4

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