nsarray

This question already has an answer here: Removing duplicate elements from an array in Swift 38 answers Swift 3 Generics: How to Find The Common Set of Two Generic Arrays 2 answers I have a formula retuning an array as example var Array = [a,s,d,s,f,g,g,h,e] . What I want is to run a for loop or some other option that gives me back a,s,d,f,g,h,e - only the unique values. How can I do this with ios Swift? If you don't care about order: Simply use a set: let set: Set = ["a", "s", "d", "s", "f", "g" , "g", "h", "e"] print(set) // ["a", "s", "f", "g", "e", "d", "h"] If you care about the order:

What is the largest amount of objects I can put in my NSArray? The NSArray initWithCapacity method, takes an unsigned int as an argument. So whatever the maximum value of an unsigned int is on your platform may be the theoretical limit. However the actual limit is more likely to depend on the amount of memory you have available. Have you tried to find out? ;) NSMutableArray * a = [[NSMutableArray alloc] init]; NSUInteger i = 0; @try { while (1) { [a addObject:@"hi"]; i++; } } @catch (NSException * e) { NSLog(@"added %llu elements", i); } In most cases concerning the upper limits of programming

I really need some more help! I am trying to pass an array from one view controller to another. I think the latter being a 'child' view controller? My code is as follows: MainViewController.h: #import <UIKit/UIKit.h> #import <AudioToolbox/AudioToolbox.h> #import <AVFoundation/AVFoundation.h> @interface HelloWorldIOS4ViewController : UIViewController <UITableViewDelegate, UITableViewDataSource, UITextFieldDelegate, AVAudioPlayerDelegate> { NSMutableArray *countProductCode; UIPopoverController *detailViewPopover; } @property (nonatomic, retain) NSMutableArray *countProductCode; @property

When I make an NSArray using + [NSArray arrayWithObjects:] , does it copy those objects? If I release the objects after adding them to the array, will I run into problems? No, it doesn't copy them. It retains them. Yes, you can safely release the objects after adding them to the array. The docs , as always, spell this out very clearly: Arrays maintain strong references to their contents—in a managed memory environment, each object receives a retain message before its id is added to the array and a release message when it is removed from the array or when the array is deallocated. If you want a

What is the simplest way to do a binary search on an (already) sorted NSArray ? Some potential ways I have spotted so far include: The use of CFArrayBSearchValues (mentioned here ) - would this work on an NSArray ? The method indexOfObject:inSortedRange:options:usingComparator: of NSArray assumes the array is sorted and takes an opts param of type NSBinarySearchingOptions - does this mean it performs a binary search? The docs just say: Returns the index, within a specified range, of an object compared with elements in the array using a given NSComparator block. Write my own binary search