为什么我的数据在iphone中的NSMutableArray中变为零

Question

在我的应用程序中，我使用for循环在NSMutableArray中添加数据。所有都正确添加，但问题是如果迭代次数增加，则数据在特定索引值处变为零。我的代码如下：

  NSArray * sortedArray =[FilterProjectsArray sortedArrayUsingDescriptors:descriptors];
  NSMutableArray *Array1=[[NSMutableArray alloc]initWithArray:sortedArray];
 [appdelegate.filtersArray addObject:[Array1 mutableCopy]] ;

 for (int i=0; i<[appdelegate.filtersArray count]; i++)
 {
       NSLog(@"object in filtersarray count is %d",[[appdelegate.filtersArray objectAtIndex:i]count]);

 }

为此我在控制台中获取输出如下：

object in filtersarray count is 9

object in filtersarray count is 9
object in filtersarray count is 2


object in filtersarray count is 0
object in filtersarray count is 2
object in filtersarray count is 9


object in filtersarray count is 0
object in filtersarray count is 0
object in filtersarray count is 9
object in filtersarray count is 2


object in filtersarray count is 0
object in filtersarray count is 0
object in filtersarray count is 0
object in filtersarray count is 2
object in filtersarray count is 3


object in filtersarray count is 0
object in filtersarray count is 0
object in filtersarray count is 0
object in filtersarray count is 0
object in filtersarray count is 3

这是我得到的输出，我不知道为什么它会像这样。所以如果有人对此有任何想法，请告诉我。

Answer 1

只需执行addObject：Array1然后

[Array 1 release];

如果您不使用ARC。

Answer 2

当您将数组添加为对象时，您不必执行可变副本

[appdelegate.filtersArray addObject:Array1] ;