nsmutablearray

I have an NSArray, and I want to split it into two equal pieces (if odd "count" then add to the latter new array) - I want to split it "down the middle" so to speak. The following code does exactly what I want, but is there a better way?: // NOTE: `NSArray testableArray` is an NSArray of objects from a class defined elsewhere; NSMutableArray *leftArray = [[NSMutableArray alloc] init]; NSMutableArray *rightArray = [[NSMutableArray alloc] init]; for (int i=0; i < [testableArray count]; i=i+1) { if (i < [testableArray count]/2) { [leftArray addObject:[testableArray objectAtIndex:i]]; } else {

I have an NSMutableArray object that I want to add custom methods to. I tried subclassing NSMutableArray but then I get an error saying "method only defined for abstract class" when trying to get the number of objects with the count method. Why is the count method not inherited? I read somewhere else that I will have to import some NSMutableArray methods into my custom class if I want to use them. I just want to add a custom method to the NSMutableArray class. So should I subclass NSMutableArray, or should I do something else? PeyloW NSMutableArray is not a concrete class, it is just the

I am creating an app for as existing website. They currently has the JSON in the following format : [ { "id": "value", "array": "[{\"id\" : \"value\"} , {\"id\" : \"value\"}]" }, { "id": "value", "array": "[{\"id\" : \"value\"},{\"id\" : \"value\"}]" } ] which they parse after escaping the \ character using Javascript. My problem is when i parse it in iOS using the following command : NSArray *result = [NSJSONSerialization JSONObjectWithData:jsonData options:kNilOptions error:&localError]; and do this : NSArray *Array = [result valueForKey:@"array"]; Instead of an Array I got NSMutableString

I've been trying to fix this crash for almost a week. The application crashes without any exception or stack-trace. The application does not crash in any way while running through instruments in zombie mode. I have a method that gets called on a different thread. The solution that fixed the crash was replacing [self.mutableArray removeAllObjects]; with dispatch_async(dispatch_get_main_queue(), ^{ [self.searchResult removeAllObjects]; }); I thought it might be a timing issue, so I tried to synchronize it, but it still crashed: @synchronized(self) { [self.searchResult removeAllObjects]; } Here

How do I convert NSMutableArray to NSArray in objective-c ? NSArray *array = [mutableArray copy]; Copy makes immutable copies. This is quite useful because Apple can make various optimizations. For example sending copy to a immutable array only retains the object and returns self . If you don't use garbage collection or ARC remember that -copy retains the object. hallski An NSMutableArray is a subclass of NSArray so you won't always need to convert but if you want to make sure that the array can't be modified you can create a NSArray either of these ways depending on whether you want it

I stumbled across the following shortcut in setting up a for loop (shortcut compared to the textbook examples I have been using): for (Item *i in items){ ... } As opposed to the longer format: for (NSInteger i = 0; i < [items count]; i++){ ... } //think that's right If I'm using the shorter version, is there a way to remove the item currently being iterated over (ie 'i')? Or do I need to use the longer format? Vladimir You cannot remove objects from array while fast-enumerating it: numeration is “safe”—the enumerator has a mutation guard so that if you attempt to modify the collection during

I have an NSMutableArray saved with NSUserDefaults. This array is my "favourite" items that the user can saves, so when i want to add one item, i need to read the array (from NSuserDefault) and save in the first free position. I'm using this method to add a value in the NSMutableArray -(IBAction)save{ NSMutableArray *abc = [[NSUserDefaults standardUserDefaults] objectForKey:@"12345"]; int n = [abc count]; [abc insertObject:@"aaa" atIndex:n]; NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; [[NSUserDefaults standardUserDefaults] setObject:abc forKey:@"12345"]; [defaults