Use of OC_ arrays

An array of OC: An ordered collection that stores the same or different object types.

Classification: variable arrays and immutable groups (variable groups inherit immutable groups).

Array ends with nil

-Non-variable group--------------

1. Create

1. Create an empty array

Nsarray *arr = [Nsarray array];

2. Create by Object method

Nsarray *ARR2 = [[Nsarray alloc][email protected][@ "1", @ "2", @ "3", nil]];

Nsarray *ARR3 = [[Nsarray ALLOC]INITWITHARRAY:ARR2];

4. Create by class method

Nsarray *ARR3 = [Nsarray arraywith:arr2];

Nsarray *ARR4 = [Nsarray arraywithobjects:@ "1", @ "3", @ "4", nil];

Nsarray *ARR5 = [Nsarray arraywithobject:@ "5"];

　　

　

Use of OC_ arrays