Objective-c super init 是 class 方法还是实例方法？

Question

I am new in objective c. I understand that -init() is an instance method and return an object eg myObj＝[myObj init]; will return an object myObj.

However, if self ＝[super init]; normally super refer to parent class eg NSObject which is a class, not instance .

So, Is -init() instance method or class method for super init?

thanks

Answer 1

init is an instance method. The fact that you call it on super does not change it.

Keep in mind that super does not represent the class of your object, but your object seen as an instance of its parent class in the class hierarchy.

And you never call myObj＝[myObj init]; — you call myObj = [[MyObj alloc] init] . Notice the case difference between myObj (a variable) and MyObj (the class of which this variable is an instance).

Answer 2

Generally init is used after alloc in this way:

MyObject* obj = [[MyObject alloc] init];

and alloc create the object instance, so init is an instance method, and when you override it, it's good habit to call always the parent class init .

Try to read this article .

Answer 3

Super is referring to the methods of the parent class in the current object . Calling super init will call the method init on the current object ( self ), but will use the implementation of the super class. So no - init is not a static method (this would be visible due to a + before the init method). you can call super whatMethodYouWantFromSuperclass even though it is not static. Static methods are not called on an object ( self ) but on a class ( [NSObject yourStaticMethod] ).