特殊字符转码

StringEncode.m

//特殊字符转码
- (NSString *)encodeWithString:(NSString *)string {
  NSString *charactersToEscape = @"?!@#$^&%*+,:;='\"`<>()[]{}/\\| ";
  NSCharacterSet *allowedCharacters = [[NSCharacterSet characterSetWithCharactersInString:charactersToEscape] invertedSet];
  return [string stringByAddingPercentEncodingWithAllowedCharacters:allowedCharacters];
}

//URL中包含中文的连接转码
    NSString *escapedPath = [@"http://www.baidu.com?中文" stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];

// URL中包含#，但是又不能把#格式化
    NSString *escapedPath = [@"http://www.baidu.com/#/name=维基百科" stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet characterSetWithCharactersInString:@"%^{}\"[]|\\<>"].invertedSet];