从NSString的第一行删除换行符 [英] Remove newline character from first line of NSString

问题描述

如何从NSString中删除第一个 \\\
字符？

编辑：为了阐明， do是：
如果字符串的第一行包含一个\\\
字符，则删除它否则不做任何操作。

ie：如果字符串是这样：

  @\ nhello，这是第一行\\\
this是第二行
  

，并且与第一行中不包含换行符的字符串相对：

  @hello，这是第一行\\\
this是第二行。 
  

我希望它更清楚。

  NSString * ReplaceFirstNewLine（NSString * original） 
 {
 NSMutableString * newString = [NSMutableString stringWithString：original]; 
 
 NSRange foundRange = [original rangeOfString：@\\\
]; 
 if（foundRange.location！= NSNotFound）
 {
 [newString replaceCharactersInRange：foundRange 
 withString：@]; 
} 
 
 return [[newString retain] autorelease]; 
} 
  




How can I remove the first \n character from an NSString?

Edit: Just to clarify, what I would like to do is: If the first line of the string contains a \n character, delete it else do nothing.

ie: If the string is like this:

@"\nhello, this is the first line\nthis is the second line"

and opposed to a string that does not contain a newline in the first line:

@"hello, this is the first line\nthis is the second line."

I hope that makes it more clear.

解决方案

This should do the trick:

NSString * ReplaceFirstNewLine(NSString * original)
{
    NSMutableString * newString = [NSMutableString stringWithString:original];

    NSRange foundRange = [original rangeOfString:@"\n"];
    if (foundRange.location != NSNotFound)
    {
        [newString replaceCharactersInRange:foundRange
                                 withString:@""];
    }

    return [[newString retain] autorelease];
}

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