flutter 短信分享

String messagebody = Uri.encodeComponent(shareText);
String url;
if (Platform.isAndroid) {
   url = 'sms:?body=$messagebody';
} else if (Platform.isIOS) {
   url = 'sms:&body=$messagebody';
}
 if (await canLaunch(url)) {
    return launch(url);
 } else {
    CustomToast.showShort('短信分享失败');
}