从NSString中删除开始和尾随的新行字符

Question

如何从NSString 中仅删除开始和尾随新行\n.

例如

@"\n\n\n\Hi\nHow are you\nToday.\n\n\n\n"

输出:

@"Hi\nHow are you\nToday."

谢谢.

Answer 1

使用nsstring的stringByTrimmingCharactersInSet方法返回通过从接收器的两端移除给定字符集中包含的字符而生成的新字符串.

迅速

yourString = yourString.trimmingCharacters(in: NSCharacterSet.whitespacesAndNewlines)

Objective-C的

  yourString = [yourString stringByTrimmingCharactersInSet:[NSCharacterSet newlineCharacterSet]]

Answer 2

NSString *string = @"\n \n  new lines or white spaces in front and at the end \n \n ";
NSString *trimmedString = [string stringByTrimmingCharactersInSet:
                                  [NSCharacterSet whitespaceAndNewlineCharacterSet]];