if (IOS8) {

        UIAlertController *alertController=[UIAlertController alertControllerWithTitle:CustomLocalizedString(@"SetIp", nil) message:@"" preferredStyle:UIAlertControllerStyleAlert];

        [alertController addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {

            NSString *string=[[NSUserDefaults standardUserDefaults]stringForKey:KSETIP];

            [textField setText:string.length>?string:@""];

        }];

        UIAlertAction *action=[UIAlertAction actionWithTitle:CustomLocalizedString(@"OK", nil) style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {

            str_ip=[alertController.textFields firstObject].text;

             NSLog(@"设置的Ip=%@",str_ip);

            [[NSUserDefaults standardUserDefaults]setObject:str_ip forKey:KSETIP];

            [[NSUserDefaults standardUserDefaults]synchronize];

        }];

        UIAlertAction *action_cancel=[UIAlertAction actionWithTitle:CustomLocalizedString(@"Cancel", nil) style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {

            [self dismissViewControllerAnimated:YES completion:nil];

        }];

        [alertController addAction:action];

        [alertController addAction:action_cancel];

        [self presentViewController:alertController animated:YES completion:nil];

    }