NSString *parameterUrlStr = [NSString stringWithFormat:@"中文的字体"];
NSStringEncoding gbkEncoding = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);
NSString *url = [parameterUrlStr stringByAddingPercentEscapesUsingEncoding:gbkEncoding];
url 可以进行网络请求