黑马程序员--NSMutableArray的使用

来源：互联网发布：人工智能在线播放编辑：程序博客网时间：2024/05/16 05:48

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NSMutableArray的基本使用方法

        //1）创建数组        //i.空数组        NSMutableArray *arr1 = [NSMutableArray array];                //ii.创建的时候初始化一个元素        NSMutableArray *arr2 = [NSMutableArray arrayWithObject:@"one"];                //iii.创建的时候，初始化多个元素        NSMutableArray *arr3 = [NSMutableArray arrayWithObjects:@"one",@"two",@"three",@"four",@"five", nil];                //iv.创建一个数组，并且指定长度        NSMutableArray *arr4 = [NSMutableArray arrayWithCapacity:5];                NSLog(@"arr1 = %@",arr1);        NSLog(@"arr2 = %@",arr2);        NSLog(@"arr3 = %@",arr3);        NSLog(@"arr4 = %@",arr4);                        //2）添加元素        [arr1 addObject:@"zhang"];        NSLog(@"arr1 = %@",arr1);                //插入元素到指定的位置        [arr2 insertObject:@"four" atIndex:0];        NSLog(@"arr2 = %@",arr2);                        //3）删除元素        //i.根据对象内容删除        [arr3 removeObject:@"one"];        NSLog(@"arr3 = %@",arr3);        //根据下标删除        [arr3 removeObjectAtIndex:1];        NSLog(@"arr3 = %@",arr3);        //全部删除        [arr2 removeAllObjects];        NSLog(@"arr2 = %@",arr2);                        //4）修改数组        [arr3 replaceObjectAtIndex:0 withObject:@"replace"];        NSLog(@"arr3 = %@",arr3);        //修改的简便方法        arr3[0] = @"easy";        NSLog(@"arr3 = %@",arr3);                        //5）查找元素        BOOL isSearch = [arr3 containsObject:@"easy"];        NSLog(@"isSearch = %d",isSearch);                        //6）交换元素        [arr3 exchangeObjectAtIndex:0 withObjectAtIndex:2];        NSLog(@"arr3 = %@",arr3);

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