[OC Foundation框架 - 9] NSMutableArray

可变的NSArray，可以随意添加OC对象

 

1.创建

 1 void arrayCreate()

 2 {

 3     NSMutableArray *array = [NSMutableArray arrayWithObject:@"1"];

 4    

 5     [array addObject:@"2"];

 6     [array addObject:@"3"];

 7    

 8     [array removeObject:@"2"];

 9     NSLog(@"%@", array);

10 }

 

NSMutableArray 不能使用@[]创建

 

 

2.内存管理

当Array release的时候，里面的元素也会release一次

 1 void memoryManage()

 2 {

 3     NSMutableArray *array = [NSMutableArray array];

 4     Student *stu1 = [Student initWithAge:12];

 5     Student *stu2 = [Student initWithAge:42];

 6    

 7     //Will retain stu1 one time automatically

 8     [array addObject:stu1];

 9     [array addObject:stu2];

10    

11     NSLog(@"add--> stu1: %zi", [stu1 retainCount]);

12    

13     //Will release stu1 one time automatically

14     [array removeObject:stu1];

15     NSLog(@"remoe--> stu1: %zi", [stu1 retainCount]);

16    

17     NSLog(@"%@", array);

18    

19     //All element will be released one time

20     [array release];

21 }

 

3.替换元素

1 void replaceArray()

2 {

3     NSMutableArray  *array = [NSMutableArray arrayWithObjects:@"1", @"2", @"3", nil];

4     [array replaceObjectAtIndex:2 withObject:@"a"];

5     NSLog(@"%@", array);

6 }

 

4.排序

1 void arraySort()

2 {

3     NSMutableArray *array = [NSMutableArray arrayWithObjects:@"1", @"3", @"3", nil];

4     [array sortedArrayUsingSelector:@selector(compare:)];

5     NSLog(@"%@", array);

6 }

 

5.删除元素

1         NSMutableArray *a = [NSMutableArray array];

2         [a addObject:@1];

3         [a addObject:@2];

4         [a removeObject:@1];

5         NSLog(@"%@", a);

6         [a removeAllObjects];

7         NSLog(@"%@", a);