函数在调用

Question

我刚接触Swift语言和编码。我创建了一个可以调用手机号码的功能，并创建了一个可以发送文本短信的功能。调用函数完成后，sendJSON将执行。 有人能帮我吗。感谢

通话功能

func call() {
    if let telephoneURL = URL(string: "tel://\(dispatchNumber.replacingOccurrences(of: " ", with: ""))") { //Calling on the phone
            if #available(iOS 10.0, *) {
                UIApplication.shared.open(telephoneURL, options: [:], completionHandler: nil)
            } else {
                UIApplication.shared.openURL(telephoneURL)
            }
        }
    }

SendSMS功能

func sendJSON() {
let messageVC = MFMessageComposeViewController()

if(MFMessageComposeViewController.canSendText())
{
    messageVC.messageComposeDelegate = self
    messageVC.body = "test"
    messageVC.recipients = "123456789"

    UIApplication.shared.keyWindow?.rootViewController?.present(messageVC, animated: true, completion: nil)
}
}

Answer 1

您需要为此

使用completionHandler

func call() {
    if let telephoneURL = URL(string: "tel://\(dispatchNumber.replacingOccurrences(of: " ", with: ""))") { //Calling on the phone
        if #available(iOS 10.0, *) {
            UIApplication.shared.open(telephoneURL, options: [:], completionHandler: {[weak seld] in
                self?.sendJSON()
                })
        } else {
            UIApplication.shared.openURL(telephoneURL)
        }
    }
}