nsarray

I have an NSArray of NSDate objects and I want to sort them so that today is at 0, yesterday at 1 etc. Is it ascending or descending, and do i use a function, selector or what? There are different sort methods for NSArray because there may be different ways you want to sort things. NSSortDescriptors are a general way that give you a lot of options as far as what keys to use in sorting, what selectors you want to use on those keys, and overall order to use, etc. Or you can use functions or comparator blocks instead if your case requires that or if that's more convenient for your particular case

I need to check my values from NSArray which are stored dynamically. How should I print the array values in Objective-C? NSLog(@"%@",yourArray); This actually calls the description method of your NSArray and prints it to the log. http://developer.apple.com/mac/library/documentation/Cocoa/Reference/Foundation/Classes/NSArray_Class/NSArray.html#//apple_ref/occ/instm/NSArray/description 来源： https://stackoverflow.com/questions/3396336/print-array-in-objective-c

I would know how retrieve an index of an NSArray using a NSPredicate ? NSArray *array = [NSArray arrayWithObjects: @"New-York City", @"Washington DC", @"Los Angeles", @"Detroit", nil]; Wich kind of method should I use in order to get the index of "Los Angles" by giving only a NSString NB: @"Los An" or @"geles" should return the same index.. Using NSPredicate you can get array of strings that contain your search string (it seems there's no built-in method to get just element indexes): NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF CONTAINS[cd] %@", searchString]; NSArray

Is there a good way to convert a vector<int32_t> to an NSArray of NSNumber or is looping and adding to an NSMutableArray pretty much the only way? If you have a vector of objects, you can do the following: NSArray *myArray = [NSArray arrayWithObjects:&vector[0] count:vector.size()]; However, if your vector contains primitive types, such as NSInteger , int , float , etc., you would have to manually loop the values in the vector and convert them to a NSNumber first. Yes, you can create an NSArray of NSInteger s from a std::vector<NSInteger> by using the following approach: // thrown together as

I need to generate a sorted array of NSNumber s from another NSArray . I want to use the sortedArrayUsingComparator: method. I found this example in the Apple documentation: NSArray *sortedArray = [array sortedArrayUsingComparator: ^(id obj1, id obj2) { if ([obj1 integerValue] > [obj2 integerValue]) { return (NSComparisonResult)NSOrderedDescending; } if ([obj1 integerValue] < [obj2 integerValue]) { return (NSComparisonResult)NSOrderedAscending; } return (NSComparisonResult)NSOrderedSame; }]; Here I am just providing the comparator in a block, which is fine. The sort itself -- the bit that's

I have an array of type "Restaurant" which has an NSSet of "Rating." Rating has an ID and a value. I want to sort the array of Restaurant's by rating with an ID of 01, from high to low. Something like the following, but how do I use the predicate and sort descriptor together on originalArray? NSPredicate *predicate = [NSPredicate predicateWithFormat:@"Rating.rating_id=%d", ratingID]; NSSortDescriptor *descriptor = [NSSortDescriptor sortDescriptorWithKey:@"currentValue" ascending:YES]; NSArray *sorted = [[originalArray allObjects] sortedArrayUsingDescriptors:[NSArray arrayWithObject:descriptor]

I have a NSArrayController and I when I get the selectedObjects and create a NSString with the value of valueForKey:@"Name" it returns ( "This is still a work in progress " ) and all I want to have is the text in the "" how would I get that? also, this my code: NSArray *arrayWithSelectedObjects = [[NSArray alloc] initWithArray:[arrayController selectedObjects]]; NSString *nameFromArray = [NSString stringWithFormat:@"%@", [arrayWithSelectedObjects valueForKey:@"Name"]]; NSLog(@"%@", nameFromArray); Edit : I also have other strings in the array When you call valueForKey: on an array, it calls

I need to sort an NSArray containing time NSString 's such as, NSMutableArray *times = [[NSMutableArray alloc]initWithObjects:@"09:00 AM",@"07:30 AM",@"06:45 PM",@"05:00 PM",@"12:45 AM",@"12:45 PM",@"01:00 AM",@"01:15 PM", nil]; What I need is to sort the array in ascending order of time. Is there any way to do such a thing? NSMutableArray *times = [[NSMutableArray alloc]initWithObjects:@"09:00 AM",@"07:30 AM",@"06:45 PM",@"05:00 PM",@"12:45 AM",@"12:45 PM",@"01:00 AM",@"01:15 PM", nil]; NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:@"hh:mm a"];