[OC Foundation框架 - 9] NSMutableArray

可变的NSArray，可以随意添加OC对象

 

1.创建

 void arrayCreate()
 {
     NSMutableArray *array = [NSMutableArray arrayWithObject:@""];

     [array addObject:@""];
     [array addObject:@""];

     [array removeObject:@""];
     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:];
     Student *stu2 = [Student initWithAge:];

     //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:@"", @"", @"", nil];
     [array replaceObjectAtIndex: withObject:@"a"];
     NSLog(@"%@", array);
 }

 

4.排序

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

 

5.删除元素

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