Why in Objective-C, we use self = [super init] instead of just [super init]?

Question

In a book, I saw that if a subclass is overriding a superclass\'s method, we may have

self = [super init];

First, is this supposed to be do

Answer 1

Understand that the object is already alloced and self points to a memory.

Now [super init] does the initialization part.

1) If initialization is successful self points to same object before initialization

2) If initialization is failure init function returns nil and self = nil. Now we can check whether object is initialized and if yes do our magic by this code

 if(self = [super init]){
  // do our magic
 }

IT is just like we use an imageView, we normally use

UIImageView imgView = [[UIImageView alloc] init];

imgView will only have non nil value if both alloc and init is succesful.