ios oc匹配字符串 富文本化

- (NSMutableAttributedString *)text:(NSString *)string searchText:(NSString *)text

{

NSMutableString * mutableString = [[NSMutableString alloc] initWithString:string];

NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:string];

int length = 0;

while (YES) {

NSRange range = [mutableString rangeOfString:text options:NSCaseInsensitiveSearch];

if (range.length > 0) {

NSRange newRange = NSMakeRange(range.location + length, range.length);

            [str addAttribute:NSBackgroundColorAttributeName value:[UIColor colorWithHex:0xFFF45C] range:newRange];

            [str addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:17.5] range:NSMakeRange(0, string.length)];

            [str addAttribute:NSForegroundColorAttributeName value:[UIColor blackColor] range:NSMakeRange(0, string.length)];

            [mutableString deleteCharactersInRange:range];

            length += range.length;

        }else {

return str;

        }

    }

return str;

}