[Objective-c] 008_foundation framework of Nsarray and Nsmutablearray

In the Cocoa Foundation, Nsarray and Nsmutablearray are used for an ordered set of objects, the biggest difference between Nsarray and Nsmutablearray classes is that Nsarray is immutable and Nsmutablearray is mutable. They can only store cocoa objects (NSObject objects), if you want to save some raw C data (such as: Int,float,double,bool, etc.), you need to encapsulate these raw C data nsnumber type, their subscript is starting from 0, Here are some common primary operations for the Nsarray and Nsmutablearray classes.

1.NSArray initialization

Nsarray *array = [[Nsarray alloc] initwithobjects:@ "Superdo.horse", @ "Superdo.mount", @ "Superdo.ac", nil];// Initialize with an existing array nsarray *array1 = [Nsarray Arraywitharray:array];

2.NSArray Quick Enumeration

Nsarray *array = [[Nsarray alloc] initwithobjects:@ "Superdo.horse", @ "Superdo.mount", @ "Superdo.ac", Nil];for (NSString *str in array) {    NSLog (@ "%@", str);}

3.NSMutableArray Simple Sorting

Nsmutablearray*array = [[Nsmutablearray alloc] initwithobjects:@ "Superdo.horse", @ "Superdo.mount", @ "SuperDo.AC", nil The elements in the];//array are sorted by string size: [Array sortusingselector: @selector (compare:)]; NSLog (@ "sorted array:%@", array);

4. String---> Nsarray

NSString *string = [[NSString alloc] initwithstring:@ "a| b| c| D "]; NSLog (@ "string:%@", string); Nsarray *array = [string componentsseparatedbystring:@ "|"]; NSLog (@ "array:%@", array);

5.NSArray---> Strings

Nsarray *array = [[Nsarray alloc] initwithobjects:@ "A", @ "B", @ "C", @ "D", nil]; NSString *string = [Array componentsjoinedbystring:@ "|"]; NSLog (@ "string:%@", string);

6. Element manipulation

Insert element Nsmutablearray *array = [Nsmutablearray arraywithobjects:                         @ "One", @ "one", @ "three", nil];[ Array addobject:@ "four"; NSLog (@ "array:%@", array);//delete element [array removeobjectatindex:1]; NSLog (@ "array:%@", array);//enumeration element (formerly Backward) nsenumerator  *enumerator = [Array Objectenumerator];id next;while (next = [ Enumerator Nextobject]) {    NSLog (@ "Object------":%@ ", next);} enumeration element (from backward forward) nsenumerator *enumerator = [Array Reverseobjectenumerator];id object;while (object = [Enumerator Nextobject ] {    NSLog (@ "Object------":%@ ", object);}

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Reprinted from "Baby bus Superdo Team" original link: http://www.cnblogs.com/superdo/p/4594178.html

[Objective-c] 008_foundation framework of Nsarray and Nsmutablearray