I want to force user to use my own init method (for example -(id)initWithString:(NSString*)foo;) and not the basic [[myObject alloc]init];. how can I do that?

I’m getting the following warnings in Xcode when building my app (app runs just fine however): Could not associate debug note to atom l_OBJC_LABEL_PROTOCOL_$_NSObject Could not associate debug not...

I trying to understand class hierarchy. What are the sub classes of NSObject. Is there any graphical representation of the hierarchy?

I've been looking for a way to trigger a method when the number of displays connected to a mac changes. I know I can get the value of NSScreen.screens.count, but I need to find a way to create a no...

When subclassing NSObject in Swift, should you override hash or implement Hashable? Also, should you override isEqual: or implement the == operator?

In a blog post I have just read: 'Swift allows us to extend classes from NSObject to get Objective-C runtime features for an object. It also allows us to annotate Swift methods with @objc to allow...

How to add multi line text with custom font in UIActionSheet swift.I have tried \n.but this is not working.is this possible or not. Here is the my code. alert.addAction(UIAlertAction(title: "l...

I have a custom class defined as follows : class DisplayMessage : NSObject { var id : String? var partner_image : UIImage? var partner_name : String? var last_message : String? var date : NSDate?...

I'm trying to retrieve an array of custom object in Swift, where i get the error "UserInfo={NSDebugDescription=value for key 'root' was of unexpected class 'NSArray'. Allowed classes are '{(Music...

I have IBOutlet UILabel *label; and I want to do this UILabel *label = [titleLabel copy]; label.text = @"Clone"; titleLabel.text = @"Original"; NSLog(@"label : %@, title : %@",label.text,titleLa...

i'm working on a iOS5+ project (xcode 4.4.1 SDK 5.1) i have this code inside a unit test: [_appDelegate application:nil didFinishLaunchingWithOptions:nil]; UITabBarController *tabBarController =...

I want to get all the native classes (NSString, NSNumber, int, float, NSSet, NSDictionary) that I have loaded into my iOS Project.. i.e., if I have created a custom class named "TestClass" I don't...

I have read some posts like this one about the difference between subclassing NSObject in Swift or just having its native base class with no subclassing. But they all are a bit old posts, and I am ...

I am using ViewModel class and want to setup observer if any changes into loginResponse variable. @objcMembers class ViewModel: NSObject { var count = 300 @objc dynamic var loginResponse :Stri...

What is the purpose/use of NSObject in Objective-C? I see classes that extend NSObject like this: @interface Fraction : NSObject In C++ or Java, we don't use any variables like NSObject even th...

According to ARC in iOS, an object must have at least one strong reference to stay in memory, when there is no strong reference (ie. reference count becomes 0), the object will be deallocated from ...

There is a current view as UIViewController which call "LoginView" but I'm not in, I'm in a NSObject class and I want to call, display an other UIViewController which is call "MapView". How can I d...

I'm making a game that needs to play music. To make my code more manageable, I wanted to make an NSObject that takes care of the sounds (like fading, playing sounds in a playlist, etc). I have this...

Following code works perfectly in swift 3.x but not in swift 4. let selector = "managerDidDetectedStation:" let observer = <UIViewController subclass object> let station = <Station Object...

All of the sudden Xcode is giving me an error "unexpected '@' in program" at the beginning of my object @interface. This is happening in a bunch of my objects that were previously working... Her...

I created this class for my object City class City: NSObject { var _name:String = "" var name:String { get { return _name } set (newVal) { _name = newVal } } } then when I create my ob...

I'm just wondering why delegate in binding iOS project has to use BaseType(typeof(NSObject)) attribute when it's iOS counterpart does not use NSObject iOS code: @protocol TestDelegate - (void)on...

Here is the layout of an example Class, can someone guide me on what's best practice when creating a subclass of NSObject? class MyClass: NSObject { var someProperty: NSString! = nil override ...

I'd like to JSON-serialize my own custom classes. I'm working in Objective-C / iOS5. I'd like something to do the following: Person* person = [self getPerson ]; // Any custom object, NOT based on ...

I am blocking into something and I am sure it is too big. I have a custom object that look like this @interface DownloadObject : NSObject <NSCoding>{ NSNumber *key; NSString *name; NS...