ios - 从 NSAttributedString 中提取最后 50 行

Question

是否有一种简单的方法来拆分 NSAttributedString 以便我只得到最后 50 行左右？

NSMutableAttributedString *resultString = [receiveView.attributedText mutableCopy];
[resultString appendAttributedString:[ansiEscapeHelper attributedStringWithANSIEscapedString:message]];
if ([[resultString.string componentsSeparatedByCharactersInSet:[NSCharacterSet newlineCharacterSet]] count]>50) {
    //resultString = [resultString getLastFiftyLines];
}

Answer 1

is there a simple way to split a NSAttributedString so i get only the last 50 or so lines?

没有。您将必须请求 string 并确定您感兴趣的范围，然后使用 - [ NSAttributedString attributedSubstringFromRange:]:

- (NSAttributedString *)lastFiftyLinesOfAttributedString:(NSAttributedString *)pInput
{
  NSString * string = pInput.string;
  NSRange rangeOfInterest = ...determine the last 50 lines in "string"...;
 return [pInput attributedSubstringFromRange:rangeOfInterest];
}