从NSMutableArray获取最后五个值 [英] Fetch last five values from NSMutableArray

问题描述

我有一个 NSMutableArray ，其计数为10，我想提取最后5个值，并将它们存储在另一个数组中。 我认为 - （NSArray *）subarrayWithRange：（NSRange）范围（

  NSRange theRange; 
 theRange.location = [wholeArray count]  -  5; 
 theRange.length = 5; 
 NSArray * result = [wholeArray subarrayWithRange：theRange]; 
  

EDIT ：小心检查您的数组是否至少有五个元素，否则 subarrayWithRange 会抛出异常。

I have a NSMutableArray whose count is 10 and I want to extract the last 5 values and store them in another array. How can I do this?

解决方案

I think that - (NSArray *) subarrayWithRange:(NSRange)range (doc) might help you.

NSRange theRange;
theRange.location = [wholeArray count] - 5;
theRange.length = 5;
NSArray *result = [wholeArray subarrayWithRange:theRange];

EDIT : Be careful to check that your array has at least five elements, else, subarrayWithRange will throw an exception.

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