NSString *urlString = @"https://www.baidu.com/s?ie=UTF-8&tn=90594569_hao_pg&wd=鸿雁"; NSString *encodedString = (NSString *)  CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes      (kCFAllocatorDefault,      (CFStringRef)urlString,       (CFStringRef)@"!$&'()*+,-./:;=?@_~%#[]",NULL,      kCFStringEncodingUTF8));复制代码