Question

我的数组中包含每个索引的数组。

array is :(
        (
        "http://localhost/ColorPicker/upload/2014-01-14-04-01-19g1.jpg",
        "http://localhost/ColorPicker/upload/2014-01-14-04-01-20g2.jpg",
        "http://localhost/ColorPicker/upload/2014-01-14-04-01-20g3.jpg"
    ),
        (
        "http://localhost/ColorPicker/upload/2014-01-14-04-01-49y1.jpg",
        "http://localhost/ColorPicker/upload/2014-01-14-04-01-50y2.jpg"
    ),
        (
        "http://localhost/ColorPicker/upload/2014-01-14-04-01-50y3.jpg",
        "http://localhost/ColorPicker/upload/2014-01-14-04-01-51y6.jpg"

    )
)

我想制作一个类似

的数组

  (  
"http://localhost/ColorPicker/upload/2014-01-14-04-01-50y3.jpg",
"http://localhost/ColorPicker/upload/2014-01-14-04-01-51y6.jpg", 
"http://localhost/ColorPicker/upload/2014-01-14-04-01-50y3.jpg",
"http://localhost/ColorPicker/upload/2014-01-14-04-01-51y6.jpg",                    
"http://localhost/ColorPicker/upload/2014-01-14-04-01-50y3.jpg",
"http://localhost/ColorPicker/upload/2014-01-14-04-01-51y6.jpg"
    )

如何在数组中消除（），（）并创建一个包含url的单个数组。

Answer 1

你需要制作一个新阵列：

NSMutableArray *newArray = [[NSMutableArray alloc] init];
for (NSArray *a in array)
    [newArray addObjectsFromArray:a];

Answer 2

您可以使用键值编码运算符“@unionOfArrays”来展平数组：

NSArray *nested = @[@[@"A1", @"A2", @"A3"], @[@"B1", @"B2", @"B3"], @[@"C1", @"C2", @"C3"]];
NSArray *flattened = [nested valueForKeyPath:@"@unionOfArrays.self"];

NSLog(@"nested = %@", nested);
NSLog(@"flattened = %@", flattened);

输出：

nested = (
        (
        A1,
        A2,
        A3
    ),
        (
        B1,
        B2,
        B3
    ),
        (
        C1,
        C2,
        C3
    )
)
flattened = (
    A1,
    A2,
    A3,
    B1,
    B2,
    B3,
    C1,
    C2,
    C3
)

Answer 3

您需要编写代码来遍历外部数组，将第二级数组的内容复制到“平面”数组。像这样：

（根据Carl Norum的帖子编辑，使用addObjectsFromArray）

-(NSArray )flattenArray: (NSArray *) sourceArray;
{
  NSMutableArray *result = [[NSMutableArray alloc] init];
  for (NSArray *array sourceArray)
  {
  //Make sure this object is an array of some kind. 
  //(use isKindOFClass to handle different types of array class cluster)
  if ([array isKindOfClass: [NSArray class])
  {
    [result addObjectsFromArray: array];
  }
  else
  {
    NSLog(@"Non-array object %@ found. Adding directly.", array);
    [result addObject: array];
  }
  return [result copy]; //return an immutable copy of the result array
}

Answer 4

你必须规范你的数组循环遍历数组，然后遍历所有子数组并将它们添加到另一个数组这样的事情应该足以让你开始：here

如何从NSArray中删除括号？

4 个答案: