如何从Whatsapp返回应用程序

Question

我尝试使用此方法从我的iOS应用程序发送whatsapp上的消息。

对于文字

NSString * msg = @"YOUR MSG";

NSString * urlWhats = [NSString stringWithFormat:@"whatsapp://send?text=%@",msg];

NSURL * whatsappURL = [NSURL URLWithString:[urlWhats stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];

if ([[UIApplication sharedApplication] canOpenURL: whatsappURL]) {
[[UIApplication sharedApplication] openURL: whatsappURL];

}
 else {
UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"WhatsApp not installed." message:@"Your device has no WhatsApp installed." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];

  [alert show];
}

我有两个问题。

1。）如何从Whatsapp返回应用程序。

2.。）如何通过输入电话号码而不是从联系人列表中提取来发送消息或图像等。