nsarray

I have the following situation: NSArray( NSArray( string1, string2, string3, string4, string5, ) , NSArray( string6, string7, string8, string9, string10, ) ) Now I need a predicate that returns the array that contains a specific string. e.g. Filter Array that contains string9 -> I should get back the entire second array because I need to process the other strings inside that array. Any ideas? Just for completeness: It can be done using predicateWithFormat: : NSArray *array = @[ @[@"A", @"B", @"C"], @[@"D", @"E", @"F"], ]; NSString *searchTerm = @"E"; NSPredicate *predicate = [NSPredicate

I have to create a dynamic NSArray, that is, I don't know the size of the array or what elements the array is going to have. The elements need to be added to the array dynamically. I looked at the NSArray class reference. There is a method called arrayWithObjects, which should be used at the time of initializing the array itself. But I don't know how to achieve what I need to do. I need to do some thing like the following: NSArray *stringArray = [[NSArray init] alloc] ; for (int i = 0; i < data.size; i++){ stringArray.at(i) = getData(i); } pgb If you create an NSArray you won't be able to add

I want to store my CGPoint to the NSMutable Array, so , I have method like this: [self.points addObject:CGPointMake(x, y)]; But I got the error, it said that : Incompatible type for argument 1 of "addObject". So, I check out the API, - (void)addObject:(id)anObject anObject The object to add to the end of the receiver's content. This value must not be nil. So, I think the " CGPointMake " can make a Object, but it can't be assigned. What happens? kharrison The problem is that CGPoint is actually just a C structure it is not an object: struct CGPoint { CGFloat x; CGFloat y; }; typedef struct

Value of my NSArray includes the duplicates. I find the duplicates but now how can I find the no. they repeat? You can use NSCountedSet for this. Add all your objects to a counted set, then use the countForObject: method to find out how often each object appears. Example: NSArray *names = [NSArray arrayWithObjects:@"John", @"Jane", @"John", nil]; NSCountedSet *set = [[NSCountedSet alloc] initWithArray:names]; for (id item in set) { NSLog(@"Name=%@, Count=%lu", item, (unsigned long)[set countForObject:item]); } You can try something like this __block NSInteger elementCount = 0; NSArray *array;

I've read that the best way of creating an index (the a-z at the side of a uitableview) is to set up an array of nsdictionaries, where each dictionary corresponds to a section, and a rowValue key contains an array of the rows. NSDictionary headerTitle => ‘A’ rowValues => {”Aardvark”, “Ape”, “Aquaman”} NSDictionary headerTitle => ‘B’ rowValues => {”Bat”, “Boot”, “Bubbles”} etc But how can this be created from an array of all the row titles - {”Aardvark”, “Ape”, “Aquaman”, ”Bat”, “Boot”, “Bubbles”, "Cat", "Cabbage" etc} ...? #pragma mark - #pragma mark View lifecycle - (void)viewDidLoad { [super

I have a NSMutableArray which contains a few NSString objects. How can I test if the array contains a particular string literal? I tried [array containsObject:@"teststring"] but that doesn't work. What you're doing should work fine. For example NSArray *a = [NSArray arrayWithObjects:@"Foo", @"Bar", @"Baz", nil]; NSLog(@"At index %i", [a indexOfObject:@"Bar"]); Correctly logs "At index 1" for me. Two possible foibles: indexOfObject sends isEqual messages to do the comparison - you've not replaced this method in a category? Make sure you're testing against NSNotFound for failure to locate, and

What is the difference b/w NSArray and NSMutableArray ? NSMutableArray (and all other classes with Mutable in the name) can be modified. So, if you create a plain NSArray , you cannot change its contents later (without recreating it). But if you create an NSMutableArray , you can change it — you'll notice it has methods like -addObject: and -insertObject:atIndex: . See the documentation for details. The "mutable" types are classes which can be changed after they've been initialized, like NSMutableString vs NSString . Jagat Dave NSArray : in NSArray we can not change index.... Means fix array.