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

创建NSMutableArray可变数组

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];

向数组中添加元素

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);

在数组中删除元素

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);

替换数组中某个位置的元素

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"];

交换数组中某两个指定位置的元素

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];