[OC Foundation框架

可变的NSArray，可以随意添加OC对象

 

1.创建

void arrayCreate()
{
    NSMutableArray *array = [NSMutableArray arrayWithObject:@"1"];
   
    [array addObject:@"2"];
    [array addObject:@"3"];
   
    [array removeObject:@"2"];
    NSLog(@"%@", array);
}

 

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

void memoryManage()
{
    NSMutableArray *array = [NSMutableArray array];
    Student *stu1 = [Student initWithAge:12];
    Student *stu2 = [Student initWithAge:42];
   
    //Will retain stu1 one time automatically
    [array addObject:stu1];
    [array addObject:stu2];
   
    NSLog(@"add--> stu1: %zi", [stu1 retainCount]);
   
    //Will release stu1 one time automatically
    [array removeObject:stu1];
    NSLog(@"remoe--> stu1: %zi", [stu1 retainCount]);
   
    NSLog(@"%@", array);
   
    //All element will be released one time
    [array release];
}

 

3.替换元素

void replaceArray()
{
    NSMutableArray  *array = [NSMutableArray arrayWithObjects:@"1", @"2", @"3", nil];
    [array replaceObjectAtIndex:2 withObject:@"a"];
    NSLog(@"%@", array);
}

 

4.排序

void arraySort()
{
    NSMutableArray *array = [NSMutableArray arrayWithObjects:@"1", @"3", @"3", nil];
    [array sortedArrayUsingSelector:@selector(compare:)];
    NSLog(@"%@", array);
}

 

5.删除元素

        NSMutableArray *a = [NSMutableArray array];
        [a addObject:@1];
        [a addObject:@2];
        [a removeObject:@1];
        NSLog(@"%@", a);
        [a removeAllObjects];
        NSLog(@"%@", a);