nsarray

I have this code: var NToDel:NSArray = [] var addInNToDelArray = "Test1 \ Test2" How to add addInNToDelArray in NToDel:NSArray ? You can't - NSArray is an immutable array, and as such once instantiated it cannot be changed. You should turn it into a NSMutableArray , and in that case it's as simple as: NToDel.addObject(addInNToDelArray) Alternatively, you can insert the value at instantiation time: var NToDel:NSMutableArray = [addInNToDelArray] but that's not about adding, it's about initializing - and in fact, after that line you cannot do any change to the array elements. Note that there's an

I have an array which is filled with NSDictionaries . I want to find the index of one of the dictionary, but what I know about this dictionary is only a value for key @"name". How do I do it ? Find index of first dictionary in theArray whose value for @"name" is theValue : NSUInteger index = [theArray indexOfObjectPassingTest: ^BOOL(NSDictionary *dict, NSUInteger idx, BOOL *stop) { return [[dict objectForKey:@"name"] isEqual:theValue]; } ]; index will be NSNotFound if no matching object is found. NSArray *temp = [allList valueForKey:@"Name"]; NSInteger indexValue = [temp indexOfObject:YourText

I have a class Song with properties Title, Key, Artist, etc. There are no methods. I loop through a database of song information and create a Song object for each, populating the properties, and then store the Song objects in an NSArray. Then I thought, why not just have a struct Song with all those same properties instead of a class Song. Doing so would eliminate the class files, the #import Song line in the using class's .m file, and the need to alloc, init, release. On the other hand, I'd have to put the struct definition in every class that might need it. (Unless there's some globally

i spent all afternoon banging my head against the wall trying to figure out why decoding of this class was failing. the class has a property that is an NSArray of Foo objects. Foo conforms to NSSecureCoding, and i have successfully encoded and decoded that class by itself. i was getting an error in initWithCoder: that said failed to decode class Foo. through some experimentation, i discovered that i needed to add [Foo class] to initWithCoder: in order for it to work. maybe this will help someone else who's having the same problem. my question is, why is this necessary? i found no suggestion

What is the best way to "slice" an NSArray from the end, rather than the beginning, of the array (for example, finding the subarray containing the last few elements of a NSArray of unknown length)? In Python, you can use negative indices to accomplish this, e.g.: new_list = old_list[-5:-3] What's the most natural way to do this in Objective-C? There's nothing to match Python's nice syntax for this, but you could do: NSUInteger count = [myArray count]; NSArray * slice = [myArray subarrayWithRange:(NSRange){count-n, n}]; You could also write up a category for NSArray , something like: @interface