Append NSStrings and NSNumber to NSMutableArrays and make NSMutable dictionary

Append NSStrings and NSNumber to NSMutableArrays and make NSMutable dictionary

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Append NSStrings and NSNumber to NSMutableArrays and make NSMutable dictionary
Tag : ios , By : FarmerDave
Date : November 25 2020, 07:22 PM

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How can one sort an NSMutableArray of NSMutableArrays containing NSStrings?

Tag : objective-c , By : Daniel Halsey
Date : March 29 2020, 07:55 AM
seems to work fine Didn't see anyone actually answering this with other than "use this function, figure it out". So here is some actual code that you can use.
Put this category at the end of your .h file (or anywhere and import the .h where ever you need to sort)
@interface NSString (SortCompare)

-(NSInteger)stringCompare:(NSString *)str2;

@implementation NSString (SortCompare)

-(NSInteger) stringCompare:(NSString *)str2
    return [(NSString *)self localizedCaseInsensitiveCompare:str2];

[myArray sortUsingSelector:@selector(stringCompare:)];
[myArray sortedArrayUsingSelector:@selector(stringCompare:)];

can I sort NSMutable array of NSStrings by their substrings using the selector (in place)?

Tag : objective-c , By : mckasty
Date : March 29 2020, 07:55 AM
wish helps you You can perform any arbitrarily complex sorting inline with NSMutableArray's sortWithOptions:usingComparator:
[myMutableArray sortWithOptions:NSSortStable usingComparator:^NSComparisonResult(NSString* str1, NSString* str2) {

    // Scan for your marker in both strings and split on it...
    // Say you store the results in substr1 and substr2...
    return [substr1 caseInsensitiveCompare:substr2];

How can I observe insertions and deletions of a dynamic number of NSMutableArrays that are contained within an NSMutable

Tag : objective-c , By : Bado
Date : March 29 2020, 07:55 AM
it should still fix some issue You can use NSNotificationCenter to post a notification every time that a new object is added or deleted.But you need to subclass NSMutableArray.
Make a subclass of NSMutableArray for the main array (the one that contains the sub-arrays), override the inserObject:atIndex method and post a notification which you can call @"subarray inserted" for example.

How to split an NSArray of sorted NSStrings into NSMutableArray of NSMutableArrays

Tag : ios , By : desmiserables
Date : March 29 2020, 07:55 AM
should help you out I would like to know how to split an NSArray of alphabetically sorted NSStrings into an NSMutableArray of NSMutableArrays.
NSString* currentLetter;
NSMutableArray* currentSubArray;

for( NSString* name in sortedArray ){

    NSString* firstLetterOfName = [name substringToIndex:1];

    if( [firstLetterOfName isEqualToString:currentLetter] ){
        // Name first letter is equal to the last one, so just add to current sub array
        [currentSubArray addObject:name];
        // New letter found, create a new sub array and add to main one

        currentSubArray = [[NSMutableArray alloc] initWithObjects:name, nil]; // needs nil
        currentLetter = firstLetterOfName;
        [mainArray addObject:currentSubArray];


Loop through lines in file and fill NSMutable array with NSStrings

Tag : ios , By : Cowtung
Date : March 29 2020, 07:55 AM
seems to work fine I have an array, lines, that consists of the lines in a text file. I want to choose a particular line based on its first string. So I loop through the file like this:
myMutableArray = [[str componentsSeparatedByCharactersInSet: [NSCharacterSet characterSetWithCharactersInString:@";"]] mutableCopy];
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