NSString删除空格，只留一个空格

Question

  

可能重复：
  How do you remove extra empty space in NSString?

我正在试图弄清楚如何从字符串中删除所有空格但只留下一个空格。 那就是我有一个像

这样的字符串

"this    is  my     test  string"

结果将是

"this is my test string"

谢谢

更新：在此处找到答案 Removing multiple spaces in NSString

Answer 1

你可以尝试这个：

NSString *string=@"this    is  my     test  string";

NSCharacterSet *spaces = [NSCharacterSet whitespaceCharacterSet];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF != ''"];
NSArray *tempArray = [[string componentsSeparatedByCharactersInSet:spaces] filteredArrayUsingPredicate:predicate];
string = [tempArray componentsJoinedByString:@" "];