Despite you’re casting NSMutableSet to NSArray, that simple casting won’t make NSSet class respond to NSArray‘s messages. You have to fill an actual NSArray with the elements of the NSSet like this: NSArray *array = [theNsSet allObjects];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@”type == %@”, @”standard”]; NSArray *filteredArray = [myArray filteredArrayUsingPredicate:predicate]; id firstFoundObject = nil; firstFoundObject = filteredArray.count > 0 ? filteredArray.firstObject : nil; NB: The notion of the first found object in an NSSet makes no sense since the order of the objects in a set is undefined.
The KVC approach looks like this: int max = [[numbers valueForKeyPath:@”@max.intValue”] intValue]; or NSNumber * max = [numbers valueForKeyPath:@”@max.intValue”]; with numbers as an NSArray
This is a year old but the solution is pretty simple … do as @Simon suggested but do not specify a cancel button title, so: UIActionSheet *alert = [[UIActionSheet alloc] initWithTitle: titleString delegate: self cancelButtonTitle: nil destructiveButtonTitle: nil otherButtonTitles: nil]; But after adding your normal buttons, add the cancel button, like: for( NSString *title in … Read more
Take a look at keypaths. They are super powerful and I use them instead of NSPredicate classes most of the time. Here is how you would use them in your example… NSArray *uniqueStates; uniqueStates = [customObjects valueForKeyPath:@”@distinctUnionOfObjects.state”]; Note the use of valueForKeyPath instead of valueForKey. Here is a more detailed/contrived example… NSDictionary *arnold = [NSDictionary … Read more
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.
Swift 3 IndexSet can be created directly from an array literal using init(arrayLiteral:), like so: let indices: IndexSet = [1, 2, 3] Original answer (Swift 2.2) Similar to pbasdf’s answer, but uses forEach(_:) let array = [1,2,3,4,5,7,8,10] let indexSet = NSMutableIndexSet() array.forEach(indexSet.add) //Swift 3 //Swift 2.2: array.forEach{indexSet.addIndex($0)} print(indexSet)
This will return an array containing the value of licensePlate from each item in the myCars array: NSArray *licensePlates = [myCars valueForKeyPath:@”licensePlate”] If you want only unique items (for example), you can do something like this: NSArray *licensePlates = [myCars valueForKeyPath:@”@distinctUnionOfObjects.licensePlate”]; For more possibilities, see the Collection Operators documentation in the Key-Value Coding Programming Guide.
I think this will do it: brandDescriptor = [[NSSortDescriptor alloc] initWithKey:@”brand” ascending:YES]; sortDescriptors = [NSArray arrayWithObject:brandDescriptor]; sortedArray = [myArray sortedArrayUsingDescriptors:sortDescriptors]; I pulled the code from Sort Descriptor Programming Topics. Also, Key-Value Coding comes into play, in that sortedArrayUsingDescriptors: will send a valueForKey: to each element in myArray, and then use standard comparators to sort the … Read more
The index returned by indexOfObject will be the first index for an occurence of your object. Equality is tested using isEqual method. The garbage value you get is probably equal to NSNotFound. Try testing anIndex against it. The number you are looking for isn’t probably in your array : NSNumber *num=[NSNumber numberWithInteger:56]; NSInteger anIndex=[myArray indexOfObject:num]; … Read more