Question

我在iOS开发中很新。基本上我有一个多维数组，如下所示

Array
(
[0] => Array
  (
  [Name] => Peter
  [Gender] => Male
  )
[1] => Array
  (
  [Name] => Glenn
  [Gender] => Female
  )
[2] => Array
  (
  [Name] => Richard
  [Gender] => Male
  )
)

在某些时候，我将在某个索引处添加额外的键/值。举个例子，我在数组末尾的索引1处添加一个新条目（这个序列实际上并不是很麻烦，它可以放在前面或末尾）[Location] => Japan

因此，数组应如下所示：

Array
(
[0] => Array
  (
  [Name] => Peter
  [Gender] => Male
  )
[1] => Array
  (
  [Name] => Glenn
  [Gender] => Female
  [Location] => Japan
  )
[2] => Array
  (
  [Name] => Richard
  [Gender] => Male
  )
)

我怎样才能实现这一目标？请检查我下面的代码，因为我真的不知道因为每次尝试都会导致EXC_BAD_ACCESS或应用被终止。谢谢，杰森。

for(int x=0; x<[arrayVisitor count]; x++)
{
  if ([[[arrayVisitor objectAtIndex:x]objectForKey:(@"Gender")]isEqual:@"Female"])
     [[arrayVisitor objectAtIndex:x] addObject:[NSMutableDictionary dictionaryWithObjectsAndKeys: @"Location",@"Japan",nil]];
}

Answer 1

对于此类型的数组添加键值，您需要使用NSMutableArray和NSMutableDictionary。

NSMutableArray *outerArray=[[NSMutableArray alloc] init];

NSMutableDictionary *mutableDict=[[NSMutableDictionary alloc]initWithDictionary:[outerArray objectAtIndex:1]];
[mutableDict setObject:@"Japan" forKey:@"Location"];

[outerArray replaceObjectAtIndex:1 withObject:mutableDict];

或使用for循环：------------------

NSMutableArray *arrayVisitor=[[NSMutableArray alloc] init];
int arrayLength=arrayVisitor.count;

for (int i=0;i<arrayLength;i++) {
    NSMutableDictionary *mutableDict=[[NSMutableDictionary alloc]initWithDictionary:[arrayVisitor objectAtIndex:i]];
    if ([[mutableDict valueForKey:@"Gender"] isEqualToString:@"Female"]) {
        [mutableDict setObject:@"Japan" forKey:@"Location"];
        [arrayVisitor replaceObjectAtIndex:i withObject:mutableDict];
    }
}

注意： - 它不是多维数组，它是NSDictionary对象的数组，它应该看起来像这样

Array=(
       {
           Name= Peter
           Gender= Male
       },
       {
           Name = Glenn
           Gender = Female
       },
       {
           Name = Richard
           Gender = Male
       }
     )

iOS：在特定索引处向多维数组添加键/值

1 个答案: