Nsarray unchangeable array-objective-C

An array is a set of ordered objects. In general, elements in an array are of the same type. Similar to variable strings and immutable strings, Arrays can also be variable or immutable.

Common nsarray immutable array Methods

+ (ID) arraywithobjects: obj1, obj2,... nil	Create a new array, obj1, obj2...... is its element object, ending with nil object
-(Bool) containsobject: OBJ	Determine whether the array contains the object OBJ
-(Nsuinteger) count	Returns the number of array elements.
-(Nsuinteger) indexofobject: OBJ	The first index number that contains the OBJ Element
-(ID) objectatindex; I	Returns the object stored in location I.
-(Void) makeobjectsperformselector :( SEL) Selector	Send a message containing only the selector to each element in the array.
-(Nsarray *) sortedarrayusingselector :( SEL) Selector	Sort the array according to the comparison method indicated by Selector
-(Bool) writetofile: path atomically :( bool) Flag	Writes the array to the specified file. If the flag is yes, you must first create a temporary file.