CODEWITHSUNDEEP
objective-c
elliptic00
elliptic00

Reputation: 447

Initialize subclass of NSObject

MySubClass.h

@interface MySubClass : NSObject
{
}

MySubClass.m

@interface MySubClass ()

@end

@implementation MySubClass
-(MySubClass*)initMySubClass:(id)view{
  // initialize my SubClass
}
@end

What is the proper way to write a custom initializer if I subclass from NSObject?

Do I need to use "init" inside my initializer?

Upvotes: 1

Views: 628

Answers (2)

Shinigami
Shinigami

Reputation: 2213

@michaelrccurtis's answer is correct. But here's more thorough documentation on how you generally do initialization in Obj-C.

Basically, every class can have a designated initializer and if you subclass it, you must override that initializer and call super from your subclass's designated initializer. The graphic in the docs makes this clearer.

Upvotes: 0

michaelrccurtis
michaelrccurtis

Reputation: 1172

-(instancetype)initMySubClass:(id)view {
    if(self = [super init]) {

        // custom initialization here
    }
    return self;
}

Apple docs are here: https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSObject_Class/index.html#//apple_ref/occ/instm/NSObject/init

Note that, for NSObject itself, the init method just returns self. It is still best practice to call init, however. For example, what if Apple were to include additional initialisation there in the future? Or, what if you want to change the superclass?

Upvotes: 1

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