Question

在我的iOS应用程序中，我想添加一个功能，该功能会将邀请发送给在其他应用程序（如WhatsApp或其他消息服务）中选择的人员。我不知道该怎么做。请在这方面帮助我。一些指导将不胜感激。

我尝试使用WhatsApp发送邀请。但是我无法实现。

@IBAction func invite(_ sender: UIButton) {

        let ReferCode = UserDefaults.standard.string(forKey: "ReferCode") ?? ""
        let originalString = ReferCode
        let escapedString = originalString.addingPercentEncoding(withAllowedCharacters:CharacterSet.urlQueryAllowed)

        let url  = URL(string: "whatsapp://send?text= Your referral code is\(escapedString!)")

        if UIApplication.shared.canOpenURL(url! as URL)
        {
            if #available(iOS 10.0, *) {
                UIApplication.shared.open(url! as URL, options: [:], completionHandler: nil)
            } else {
                // Fallback on earlier versions
            }
        }
    }

当我按下邀请按钮时，应用程序崩溃了。

Answer 1

如果您在nil中获得referCode值，则可能会崩溃。使用条件解包获得可选值。

@IBAction func invite(_ sender: UIButton) {

        guard let referCode = UserDefaults.standard.string(forKey: "ReferCode") else {
            debugPrint("referCode not available")
            return
        }
        let escapedString = referCode.addingPercentEncoding(withAllowedCharacters:CharacterSet.urlQueryAllowed)

        guard let url  = URL(string: "whatsapp://send?text= Your referral code is \(String(describing: escapedString))") else {
            debugPrint("URL not correct")
            return
        }

        if UIApplication.shared.canOpenURL(url)
        {
            if #available(iOS 10.0, *) {
                UIApplication.shared.open(url as URL, options: [:], completionHandler: nil)
            } else {
                // Fallback on earlier versions
            }
        }
    }

为邀请创建动作

1 个答案: