NSString中子字符串的出现次数？ [英] Number of occurrences of a substring in an NSString?

问题描述

如何获得NSString（例如 @蛋糕）出现在更大的NSString中的次数（例如 @Cheesecake，apple cake，and cherry pie）？

我需要在很多字符串上做这个，

解决方案

这不是测试，但应该是一个好的开始。

  NSUInteger count = 0，length = [str length]; 
 NSRange range = NSMakeRange（0，length）; 
 while（range.location！= NSNotFound）
 {
 range = [str rangeOfString：@cakeoptions：0 range：range]; 
 if（range.location！= NSNotFound）
 {
 range = NSMakeRange（range.location + range.length，length  - （range.location + range.length））; 
 count ++; 
} 
} 
  

How can I get the number of times an NSString (for example, @"cake") appears in a larger NSString (for example, @"Cheesecake, apple cake, and cherry pie")?

I need to do this on a lot of strings, so whatever method I use would need to be relatively fast.

Thanks!

解决方案

This isn't tested, but should be a good start.

NSUInteger count = 0, length = [str length];
NSRange range = NSMakeRange(0, length); 
while(range.location != NSNotFound)
{
  range = [str rangeOfString: @"cake" options:0 range:range];
  if(range.location != NSNotFound)
  {
    range = NSMakeRange(range.location + range.length, length - (range.location + range.length));
    count++; 
  }
}

这篇关于NSString中子字符串的出现次数？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！