iOS学习路之Objective-C（五）—— NSMutableArray

1     //对象方法创建可变数组
2     NSMutableArray *array1 = [[NSMutableArray alloc] init];
3     //类方法创建可变数组
4     NSMutableArray *array2 = [NSMutableArray arrayWithCapacity:0];

1     NSMutableArray *array = [[NSMutableArray alloc] init];
2     NSArray *tmp = [NSArray arrayWithObjects:@"jing", @"dian", @"ying", @"xue", @"yuan", nil];
3     [array addObject:@"bei"];
4     [array addObjectsFromArray:tmp];
5     //- (void)insertObject:(id)anObject atIndex:(NSUInteger)index;
6     //作用：数组中任意一个位置插入元素
7     [array insertObject:@"hao" atIndex:1];
8     NSLog(@"%@", array);

    NSMutableArray *array = [NSMutableArray arrayWithObjects:@"nan", @"jing", @"hao", nil];
#if 0
    //- (void)removeObjectAtIndex:(NSUInteger)index;
    //作用：删除数组中指定下标的元素
    [array removeObjectAtIndex:2];
#endif

#if 0
    //- (void)removeObject:(id)anObject;
    //作用：删除数组中指定的元素(有多少删多少)
    [array removeObject:@"hao"];
#endif

#if 0
    //- (void)removeObjectsInRange:(NSRange)range;
    //作用：从某位置起，删除某长度的元素
    [array removeObjectsInRange:{1, 2}];
#endif
    //- (void)removeAllObjects;
    //作用：删除数字中的全部元素
    [array removeAllObjects];

    NSLog(@"%@", array);

1     NSMutableArray *array = [NSMutableArray arrayWithObjects:@"nan", @"jing", @"hao", nil];
2     //- (void)replaceObjectAtIndex:(NSUInteger)index withObject:(id)anObject;
3     //作用：替换数组中指定下标的元素
4     [array replaceObjectAtIndex:0 withObject:@"bei"];

    NSMutableArray *array = [NSMutableArray arrayWithObjects:@"nan", @"jing", @"hao", nil];
    //- (void)exchangeObjectAtIndex:(NSUInteger)idx1 withObjectAtIndex:(NSUInteger)idx2;
    //作用：交换数组中指定下标的两个元素
    [array exchangeObjectAtIndex:0 withObjectAtIndex:2];