NSAttributedString 去空白字符

对应 NSString 去空白字符

@implementation NSAttributedString (Strip)

- (NSAttributedString *)wbt_trimmedString
{
    NSUInteger start = [self.string rangeOfCharacterFromSet:[NSCharacterSet whitespaceAndNewlineCharacterSet].invertedSet].location;
    
    NSUInteger end = [self.string rangeOfCharacterFromSet:[NSCharacterSet whitespaceAndNewlineCharacterSet].invertedSet options:NSBackwardsSearch].location;
    
    return [self attributedSubstringFromRange:NSMakeRange(start, end - start + 1)];
}

- (NSAttributedString *)wbt_leftTrimmedString
{
    NSUInteger index = [self.string rangeOfCharacterFromSet:[NSCharacterSet whitespaceAndNewlineCharacterSet].invertedSet].location;
    
    return [self attributedSubstringFromRange:NSMakeRange(index, self.length - index)];
}

- (NSAttributedString *)wbt_rightTrimmedString
{
    NSUInteger index = [self.string rangeOfCharacterFromSet:[NSCharacterSet whitespaceAndNewlineCharacterSet].invertedSet options:NSBackwardsSearch].location;
    
    return [self attributedSubstringFromRange:NSMakeRange(0, index + 1)];
}

@end