stringByAddingPercentEncodingWithAllowedCharacters

网络访问请求：中文空格字符编码/解码

stringByAddingPercentEscapesUsingEncoding(只对 `#%^{}[]|\"<> 加空格共14个字符编码，不包括”&?”等符号), ios9将淘汰，建议用stringByAddingPercentEncodingWithAllowedCharacters方法  URLFragmentAllowedCharacterSet  "#%<>[\]^`{|}          URLHostAllowedCharacterSet      "#%/<>?@\^`{|}          URLPasswordAllowedCharacterSet  "#%/:<>?@[\]^`{|}          URLPathAllowedCharacterSet      "#%;<>?[\]^`{|}          URLQueryAllowedCharacterSet     "#%<>[\]^`{|}          URLUserAllowedCharacterSet      "#%/:<>?@[\]^`

网络访问请求：中文空格字符解码

 stringByRemovingPercentEncoding  ----  xcode7可能会提示要将stringByAddingPercentEscapesUsingEncoding替换成此方法，要根据是否是解码来区分          */          //代替stringByAddingPercentEscapesUsingEncoding          let customAllowedSet =  NSCharacterSet(charactersInString:"`#%^{}\"[]|\\<> ").invertedSet 

使用方法

NSString * resourcePath = @"https://www.xiaocaobank.com";   NSString *encodePath ;   if (!IOS7_OR_LATER) {       encodePath = [resourcePath stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];   }else{       encodePath = [resourcePath stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet characterSetWithCharactersInString:@"`#%^{}\"[]|\\<> "].invertedSet];   }