How to link WhatsApp with another app: A step-by-step guide
The Share Extension, included in iOS 8.0, allows you to easily share content from one app installed on your iPhone to another. The Share Extension allows you to share up to 30 different types of media files. All files: 2 GB
Here’s what a FAQ page says on linking WhatsApp with another app: wa.me/Use where the phone number is in international format. If you want to connect WhatsApp with another app on an iPhone, there are several ways to do it depending on what you want to share or automate. From opening a WhatsApp chat with a link to sharing photos, videos, PDFs and other files, iOS offers different options. Here’s how Universal Links, custom URL schemes and Share Extensions can be used to connect another app with WhatsApp, along with the key file-sharing limits to keep in mind. Do not use plus signs, zeros, brackets, or dashes when writing phone numbers in international format. Universal Links can also include a pre-written message that will automatically appear in the chat’s text field. https://wa.me/whatsappphonenumber/?text=urlencodedtextUse where is whatsappphonenumberthe phone number in international format and URL-encodedtextthe pre-written URL encoded message. If you want to confirm that WhatsApp is installed on the user’s iPhone using [UIApplication canOpenURL:] , be sure to include the WhatsApp URL in the LSApplicationQueriesSchemes key in your app’s Info.plist. This is the most commonly used method for sharing content on WhatsApp. To use the Share Extension, create a sample UIActivityViewController and include it in your app.