How to count the number of lines in an Objective-C string (NSString)?

Question

I want to count the lines in an NSString in Objective-C.

  NSInteger lineNum = 0;   NSString *string = @"abcde\nfghijk\nlmnopq\nrstu";   NSInteger length = [string length];   NSRange range = NSMakeRange(0, length);   while (range.location < length) {       range = [string lineRangeForRange:NSMakeRange(range.location, 0)];       range.location = NSMaxRange(range);       lineNum += 1;   } 

Is there an easier way?

Answer 1

Apple recommends this method:

NSString *string; unsigned numberOfLines, index, stringLength = [string length];  for (index = 0, numberOfLines = 0; index < stringLength; numberOfLines++)     index = NSMaxRange([string lineRangeForRange:NSMakeRange(index, 0)]); 

See the article. They also explain how to count lines of wrapped text.

Answer 2

well, a not very efficient, but nice(ish) looking way is

NSString *string = @"abcde\nfghijk\nlmnopq\nrstu"; NSInteger length = [[string componentsSeparatedByCharactersInSet:                                 [NSCharacterSet newlineCharacterSet]] count]; 

Swift 4:

myString.components(separatedBy: .newlines)