Parsing and sorting NSMutableArray Objective C

Question

I have a UITextField with text: 9, 1, x, 1, 3, 3, y, 8

I need to remove all duplicates, remove all non-numeric characters and arrange the remaining numbers in ascending order.

So far I have:

-(IBAction)sortArrayPressed:(id)sender {

NSMutableArray *array = [[NSMutableArray alloc]init];
[array addObject:self.textToParseTextField.text];

        NSLog([array description],nil);

}

The output reads:

Project[10176:2274463] (
    "9, 1, x, 1, 3, 3, y, 8"
)

Am I correct using NSMUtableArray? How do we handle parsing and sorting this sort of array which has both types Int and String? Thanks!

You need to parse the string. All you've done so far is add the single string as an element of the array. That doesn't do anything for you. — rmaddy
– rmaddy, Commented Mar 22, 2017 at 5:04
Is that one element in the array or just a mistake when making a quick example? — Rikh
– Rikh, Commented Mar 22, 2017 at 5:04

Tj3n · Accepted Answer · 2017-03-22 05:29:59Z

2

You can do like this, filter remove non-numeric string, convert to Set remove duplicate:

Obj-C:

NSString *str = @"9, 1, x, 1, 3, 3, y, 8";
NSArray* a = [str componentsSeparatedByString:@", "];
NSMutableArray *b = [NSMutableArray new];
for (NSString *digit in a) {
    NSRange range = [digit rangeOfString:@"[0-9]" options:NSRegularExpressionSearch];
    if (range.location == NSNotFound) {

    } else {
        [b addObject:digit];
    }
}
b = [NSMutableArray arrayWithArray:[NSSet setWithArray:b].allObjects];
[b sortUsingSelector:@selector(compare:)]; //(1,3,8,9)

Swift:

let a = "9, 1, x, 1, 3, 3, y, 8".components(separatedBy: ", ")
let b = a.filter({ $0.range(of: "[0-9]", options: .regularExpression, range: nil, locale: nil) != nil })
Array(Set(b)).sorted() //["1", "3", "8", "9"]

edited Mar 22, 2017 at 5:29

answered Mar 22, 2017 at 5:11

Tj3n

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1 Comment

rmaddy Over a year ago

The question is tagged Objective-C, the question's title mentions Objective-C, and the code in the question is in Objective-C. Posting an answer in Swift isn't helpful.

Nirav D · Accepted Answer · 2017-03-22 05:30:06Z

2

Use NSCharacterSet to get all number from string after that create array from it and then use NSSet to get the unique object. Sort your array from set and convert array to string.

NSString *string = @"9, 1, x, 1, 3, 3, y, 8";
NSCharacterSet *nonDigitCharacterSet = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];
NSArray *numberArray = [string componentsSeparatedByCharactersInSet:nonDigitCharacterSet];

NSMutableArray *soretedArray = [[NSMutableArray alloc] initWithArray:[[NSSet setWithArray:numberArray] sortedArrayUsingDescriptors:
                         @[[NSSortDescriptor sortDescriptorWithKey:@"integerValue"
                                                         ascending:YES]]]];
[soretedArray removeObject:@""];
NSString *newString = [soretedArray componentsJoinedByString:@", "];
NSLog(@"%@",newString); //1, 3, 8, 9

answered Mar 22, 2017 at 5:30

Nirav D

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4 Comments

nayem Over a year ago

What if NSString *string = @"9, 1, x, 1, 3, 3, y7, 8"; and I want the Output as: 1, 3, 8, 9?

Nirav D Over a year ago

@nayem First of all that is not suggested by OP, but if you have string like that then you need to first separate you string to array and then need to check individually in for loop that that object is integer or not.

nayem Over a year ago

Well, I get it. I just asked it for my curiosity

Nirav D Over a year ago

@nayem I know you have asked for curiosity thats why I replied you, but I have not edited answer because OP still not replied here. If he want something like that will edit the answer.

Dishant Rajput · Accepted Answer · 2017-03-22 05:36:42Z

Try this code :

 NSMutableArray *array1;
NSMutableArray *array2;
array1=[NSMutableArray arrayWithObjects:@"2",@"2",@"x",@"y",@"x",@"2",@"3",@"1",@"3",@"2",@"5",@"6",@"6",nil];//example
array2=[[NSMutableArray alloc]init];
for (id obj in array1)
{
    if (![array2 containsObject:obj])
    {
        [array2 addObject: obj];
    }
}
NSLog(@"new array is %@",array2);

Ascending order

NSSortDescriptor* sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:nil ascending:YES selector:@selector(localizedCompare:)];
NSArray* sortedArray = [array2 sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];                           NO;

NSLog(@"sortedArray==%@",sortedArray);

NSString * result = [sortedArray componentsJoinedByString:@""];

Remove non-numeric characters

NSCharacterSet *setToRemove =
[NSCharacterSet characterSetWithCharactersInString:@"0123456789"];
NSCharacterSet *setToKeep = [setToRemove invertedSet];

NSString *newString =
[[result componentsSeparatedByCharactersInSet:setToKeep]
 componentsJoinedByString:@""];

NSLog(@"newString=====%@",newString);

Sathish Kumar VG · Accepted Answer · 2017-03-28 13:14:23Z

remove duplicate from string

NSString *originalString = @"9, 1, x, 1, 3, 3, y, 8";
    NSMutableString *strippedString = [NSMutableString
                                       stringWithCapacity:originalString.length];

    NSScanner *scanner = [NSScanner scannerWithString:originalString];
    NSCharacterSet *numbers = [NSCharacterSet
                               characterSetWithCharactersInString:@"0123456789"];

    while ([scanner isAtEnd] == NO) {
        NSString *buffer;
        if ([scanner scanCharactersFromSet:numbers intoString:&buffer]) {
            [strippedString appendString:buffer];

        } else {
            [scanner setScanLocation:([scanner scanLocation] + 1)];
        }
    }

    NSLog(@"%@", strippedString); 

   }

i hope this code will help u...

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