特殊转义字符的处理

处理接口里不支持的转义特殊字符:

    NSCharacterSet *URLCombinedCharacterSet = [[NSCharacterSet characterSetWithCharactersInString:@"\"#%/,:<>?@[\\]^`{|}"]invertedSet];

 

    NSString *newsignStr = [signStr stringByAddingPercentEncodingWithAllowedCharacters:URLCombinedCharacterSet];