Creating the form for Agora Audio Broadcasting example

Agora-Audio-Broadcast-Form.swift

class ViewController: UIView {

    /*
     Implementation of the form
    */

    lazy var channelField: UITextField = {
        let tf = UITextField()
        tf.placeholder = "channel-name"
        tf.borderStyle = .roundedRect
        return tf
    }()
    lazy var usernameField: UITextField = {
        let tf = UITextField()
        tf.placeholder = "username"
        tf.borderStyle = .roundedRect
        tf.textContentType = .username
        return tf
    }()
    let segmentItems = ["audience", "broadcaster"]
    lazy var toggleRole: UISegmentedControl = {
        let seg = UISegmentedControl(items: self.segmentItems)
        seg.selectedSegmentIndex = 0
        return seg
    }()
    lazy var submitButton: UIButton = {
        let btn = UIButton(type: .roundedRect)
        btn.setTitle("Join", for: .normal)
        btn.addTarget(self, action: #selector(joinChannel), for: .touchUpInside)
        return btn
    }()

    func placeFields() {
        [self.channelField, self.usernameField, self.toggleRole, self.submitButton]
            .enumerated().forEach { (idx, field) in
            self.view.addSubview(field)
            field.frame = CGRect(
                origin: CGPoint(
                    x: 25,
                    y: Int(self.view.safeAreaInsets.top) + 50 + idx * 55),
                size: CGSize(width: self.view.bounds.width - 50, height: 50)
            )
            field.autoresizingMask = [.flexibleWidth, .flexibleBottomMargin]
        }
    }
    
    @objc func joinChannel() {
        let channel = self.channelField.text ?? ""
        let username = self.usernameField.text ?? ""
        let role: AgoraClientRole = self.toggleRole.selectedSegmentIndex == 0 ? .audience : .broadcaster
        if channel.isEmpty || username.isEmpty {
            // Either channel or username fields are empty.
            return
        }
        // AgoraAudioViewController is implemented in another file
        let agoraAVC = AgoraAudioViewController(
            appId: ViewController.appID, token: nil, channel: channel,
            username: username, role: role
        )
        self.present(agoraAVC, animated: true)
    }
}