带有输入数组的方法 [英] Method with an array of inputs

问题描述

我想要一个方法，我可以像NSArray那样放置尽可能多的参数：

I want to have a method where I can put as many arguments as I need like the NSArray:

- (id)initWithObjects:(id)firstObj, ... NS_REQUIRES_NIL_TERMINATION;

我可以使用：

NSArray *array = [[NSArray alloc] initWithObjects:obj1, obj2, ob3, nil];

我可以添加尽可能多的对象，只要我在末尾添加'nil'即可告诉它我已经完成了。

I can add as many objects as I want as long as I add 'nil' at the end to tell it I'm done.

我的问题是我怎么知道给出了多少论点，我将如何一次一个地通过它们？

My question is how would I know how many arguments were given, and how would I go through them one at a time?

推荐答案

- (void)yourMethod:(id) firstObject, ...
{
  id eachObject;
  va_list argumentList;
  if (firstObject)
  {               
    // do something with firstObject. Remember, it is not part of the variable argument list
    [self addObject: firstObject];
    va_start(argumentList, firstObject);          // scan for arguments after firstObject.
    while (eachObject = va_arg(argumentList, id)) // get rest of the objects until nil is found
    {
      // do something with each object
    }
    va_end(argumentList);
  }
}

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