NSArray ：释放其对象，但保留指向它的指针

发布于 2024-09-02 04:25:30 字数 556 浏览 4 评论 0原文

我在代码中声明一个 NSArray，然后从另一个数组构建该数组。我处理我的 NSArray ，当我完成时，我想释放这些对象，但我稍后再次重用这个指向 NSAarray 的指针来执行相同的过程（从另一个数组创建数组，处理然后释放）..所以我需要保留指针。我应该怎么办？

这大致是我想要做的， buildArray 正在创建并返回一个自动释放的 NSArray ：

NSArray *myArray;
for (int i = 0, i < 10, i++){
  myArray = [NSArray arrayWithArray:[self buildArray]];
  // Here I process myArray

  ...

  myArray = nil; // is my guess
  }

我需要保留一个指向我的 NSArray 的指针，以便稍后在循环中重用，但是使用 [self buildArray 创建的对象发生了什么]？为了不保留未使用的对象和数组，最好做什么？

或者也许最好的解决方案就是简单地删除数组的AllObject..？

谢谢你！

原文

I declare an NSArray in my code then building the array from another array. I process my NSArray and when I'm finished, I would like to release the objects, but I'm reusing this pointer to NSAarray again later to do the same process (creating the array from another array, process then releasing).. So I need to keep the pointer.
What should I do ?

Here is roughly what I want to do, the buildArray is creating and returning an autoreleased NSArray :

NSArray *myArray;
for (int i = 0, i < 10, i++){
  myArray = [NSArray arrayWithArray:[self buildArray]];
  // Here I process myArray

  ...

  myArray = nil; // is my guess
  }

I need to keep a pointer to my NSArray, in order to reuse later in the loop, but what is happening to the objects created with [self buildArray]? What is the best to do in order not to keep unused object and arrays ?

Or maybe the best solution is simply to removeAllObject of the array..?

Thank you!

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李不 2024-09-09 04:25:30

你不能重用 NSArray，因为它是不可变的。不过，您可以使用 NSMutableArray （它支持 -removeAllObjects）。

如果您需要保持指针，但不需要它在循环中保持不变，您可以使用

loop {
  NSArray* myArray = [self buildArray];
  ...
  // myArray = nil; // optional.
}

You can't reuse an NSArray since it's immutable. You can use an NSMutableArray (which supports -removeAllObjects) though.

If are you need is to keep the pointer, but doesn't need it constant within the loops, you could just use

loop {
  NSArray* myArray = [self buildArray];
  ...
  // myArray = nil; // optional.
}

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思念满溢 2024-09-09 04:25:30

不要那样做。相反，请执行以下操作：

for (int i = 0, i < 10, i++){
    NSArray *myArray = [self buildArray]; //buildArray should return an autoreleased object
    //Process array
    //myArray goes out of scope and is autoreleased later, releasing all of its objects
}

Don't do it like that. Instead, do:

for (int i = 0, i < 10, i++){
    NSArray *myArray = [self buildArray]; //buildArray should return an autoreleased object
    //Process array
    //myArray goes out of scope and is autoreleased later, releasing all of its objects
}

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