nsarray

If you have an NSArray of strings { @"ONE", @"ONE", @"ONE", "TWO", @"THREE", @"THREE" } How would I turn that into { @"ONE", @"TWO", @"THREE" } ..where the array follows the same order as the original. I think that you can turn an array into an NSSet to get unique items, but if you turn it back into an array you are not guaranteed to get the same order.. My initial thought was that you could do: NSArray * a = [NSArray arrayWithObjects:@"ONE", @"ONE", @"ONE", @"TWO", @"THREE", @"THREE", nil]; NSLog(@"%@", [a valueForKeyPath:@"@distinctUnionOfObjects.self"]); But that does not maintain order.

I am getting an array with null value. Please check the structure of my array below: ( "< null>" ) When I'm trying to access index 0 its crashing because of -[NSNull isEqualToString:]: unrecognized selector sent to instance 0x389cea70 Currently its crashing because of that array with a crash log: *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSNull isEqualToString:]: unrecognized selector sent to instance 0x389cea70' *** First throw call stack: (0x2d9fdf53 0x3820a6af 0x2da018e7 0x2da001d3 0x2d94f598 0x1dee57 0x1dfd31 0x302f598d 0x301a03e3 0x3052aeed

Is it possible to get all the keys from a specific NSDictionary as a seperate NSArray ? Just use NSArray*keys=[dict allKeys]; In general, if you wonder if a specific class has a specific method, look up Apple's own documentation . In this case, see NSDictionary class reference. Go through all the methods. You'll discover many useful methods that way. Yes it's possible. Use allKeys method: NSDictionary *yourDictionary; NSArray * yourKeys yourKeys = [yourDictionary allKeys]; And if you want to get all keys and values , here's what you do: for (NSString *key in dictionary) { id value = dictionary

Been playing around with XCode for about 2 weeks now, and reading about MVC a bit. I have a problem trying to connect the Model to the Controller because I find it hard to get my head around arrays. I can handle simple arrays when i programmed some in Java but I'm quiet intimidated by the Obj-C NSArrays I see. If somebody would be so kind to show me some simple calls on an array of objects i would be eternally grateful. My model: Person.h #import <Foundation/Foundation.h> @interface Person : NSObject { NSString *name; NSNumber *age; } @property(nonatomic, retain) NSString *name; @property

I have an array with a bunch of strings and I want to check if a certain string is contained in the array. If I use the containsObject : message on the array, I'm getting correct results. Do all NSString objects with the same string point to the same object? Or why is the containsObject : working? NSArray *stringArray = [NSArray arrayWithObjects:@"1",@"2",@"3",anotherStringValue, nil]; if([stringArray containsObject:@"2"]){ //DO SOMETHING } Yes, hard-coded NSStrings (string literals) (that is any @"..." in your source code) are turned into strings that exist indefinitely while your process is

I have an array containing various instances of MyClass , which has four properties: int id , int valueA , int valueB , and int valueC . On occasion, I need to modify a property for a specific instance (for this example let's say it is the one with id equal to 5 ). Currently I do it like this: MyClass *myClass = [[MyClass alloc] init]; for (int i = 0; i < [myMutableArray count]; i++) { myClass = [myMutableArray objectAtIndex:i]; if(myClass.id == 5) { myClass.valueA = 100; myClass.valueB = 200; myClass.valueC = 300; [myMutableArray replaceObjectAtIndex:i withObject: myClass]; } } Is there a

I'd like to NSArray of Class to the cacheDirectory. I've wrote as following, however it returns false. Could you tell me how to solve this problem? Thank you for your kindness. let paths2 = NSSearchPathForDirectoriesInDomains( .CachesDirectory, .UserDomainMask, true) let cachesPath: AnyObject = paths2[0] var cachedQuestions:NSArray = questions as NSArray let filePath = cachesPath.stringByAppendingPathComponent("CachedQuestions") class Dog { var id:Int? var name:String? init(id:Int, name:String) { self.id = id self.name = name } } var dogs = [Dog]() dogs.append(Dog(id:1, name:"taro")) dogs