nsarray

I am listing out a quantity percentage like stuff for an item via a webservice.The response that I get is an array of dictionaries similar to the below code.I need it in a sorted format NSArray *numberArray = [NSArray arrayWithObjects: [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:-12.0], @"price", nil], [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:-86.0],@"price", nil], [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:-8.0],@"price", nil], [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithFloat:12.0],@"price", nil

In Objective-C, how to do something like is int array[] = {1, 2, 3, 4}; in pure C? I need to fill NSArray with NSStrings with the smallest overhead (code and/or runtime) as possible. It's not possible to create an array like you're doing at compile time. That's because it's not a "compile time constant." Instead, you can do something like: static NSArray *tArray = nil; -(void)viewDidLoad { [super viewDidLoad]; tArray = [NSArray arrayWithObjects:@"A", @"B", @"C", nil]; } If it's truly important that you have this precompiled, then I guess you could create a test project, create the array (or

Is there a way to tell if a certain object is in an NSArray? The way I am adding objects to my array makes it possible for the same object to be added multiple times and I wanted to see if there was a way to see if it was already there (anywhere) in that array. The NSArray containsObject: method is precisely for this purpose, its full signature being: - (BOOL)containsObject:(id)anObject See the full NSArray Class Reference docs for more information. if([yourArray indexOfObject:yourObject] == NSNotFound) { // your object is not in here } Edit : middaparkas approach is way better (if you don't

Today I have tested using firstObject and objectAtIndex:0. If the array has the size of 0, using the former does not cause a crash while the latter causes a crash. So I'm thinking that it's better to use firstObject than objectAtIndex:0. But are there pitfalls in using firstObject over objectAtIndex:0? I have also been reading through the NSArray documentation and I am surprised and wondering why they did not mention this fact on the documentation. There is one key difference. Using firstObject returns nil if there is none. Using objectAtIndex:0 will crash your app(throws an exception) if

I have a first NSArray firstArray and I do [firstArray removeAllObjects]; after I want fill it with the content of an other array secondArray is it right write in this way? firstArray = secondArray; No, firstArray = secondArray will reassign the pointers, this is not the behavior you want. You want [firstArray addObjectsFromArray:secondArray] Since the firstArray is an NSArray, you will want to do this instead: firstArray = [NSArray arrayWithArray:secondArray]; 来源： https://stackoverflow.com/questions/6344563/copy-nsarray-inside-an-empty-nsarray

I have an NSArray that contains nested NSArrays. Im looking for a way to sort the parent array according to the object count of the nested arrays in ascending order. so if [array1 count] is 4, [array2 count] is 2 and [array3 count] is 9, i would get : array2, array1, array3... There are a few solutions, one of which is: NSSortDescriptor *sd = [NSSortDescriptor sortDescriptorWithKey:@"@count" ascending:YES]; NSArray *sds = [NSArray arrayWithObject:sd]; NSArray *sortedArray = [array sortedArrayUsingDescriptors:sds]; static NSInteger MONSortObjectsAscendingByCount(id lhs, id rhs, void* ignored) {

I have an NSArray containing objects with a size property. How can I check if the NSArray has two objects with the same value for size ? Can I do something like: int i = 0; for (id item1 in myArray) { NSDecimalNumber *size1 = [item1 size]; for (id item2 in myArray) { NSDecimalNumber *size2 = [item2 size]; if ([size1 isEqual:size2]) { i ++; } } } if (i > [myArray count]) { NSLog(@"Duplicate Sizes Exist"); } Or is there an easier way? Amar Try this code: NSSet *myset = [NSSet setWithArray:[myarray valueForKey:@"size"]]; int duplicatesCount = [myarray count] - [myset count]; size here is the