[英]How can I get a button in my subview to enable the rightbarbuttonitem in my view controller
I have a UIView with a textfield and a button, this UIView is a subview of my view controller. 我有一个带有文本字段和按钮的UIView,该UIView是视图控制器的子视图。 How can I have the button in my subview enable the view controller's navigation rightbarbuttonitem when it is pressed?
如何在子视图中使按钮按下时启用视图控制器的导航rightbarbuttonitem?
class CreateActivityView: UIView {
override init(frame: CGRect) {
super.init(frame: frame)
setupView()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
lazy var addButton: UIButton = {
let button = UIButton(type: UIButton.ButtonType.system)
button.setImage(UIImage(named: "add_dark.png"), for: .normal)
button.frame = CGRect(x: 0, y: 0, width: 24.0, height: 24.0)
button.addTarget(self, action: #selector(addButtonTapped), for: .touchUpInside)
button.isEnabled = false
button.translatesAutoresizingMaskIntoConstraints = false
return button
}()
lazy var activityNameTextField: DataEntryTextField = {
let textField = DataEntryTextField()
textField.frame = CGRect(x: 0, y: 0, width: 250.0, height: 30.0)
textField.placeholder = "Add an activity"
textField.font = UIFont(name: "Avenir", size: 17)
textField.keyboardType = UIKeyboardType.default
textField.returnKeyType = UIReturnKeyType.done
textField.translatesAutoresizingMaskIntoConstraints = false
return textField
}()
lazy var activityNameLabel: UILabel = {
let label = UILabel()
label.frame = CGRect(x: 0, y: 0, width: 0, height: 30.0)
label.font = UIFont(name: "Avenir", size: 17)
label.translatesAutoresizingMaskIntoConstraints = false
label.isHidden = true
return label
}()
func setupView() {
backgroundColor = UIColor.lightGray
addSubview(addButton)
addButton.rightAnchor.constraint(equalTo: self.safeAreaLayoutGuide.rightAnchor, constant: -16.0).isActive = true
addButton.centerYAnchor.constraint(equalTo: self.safeAreaLayoutGuide.centerYAnchor).isActive = true
addButton.heightAnchor.constraint(equalToConstant: 24.0).isActive = true
addButton.widthAnchor.constraint(equalToConstant: 24.0).isActive = true
addSubview(activityNameTextField)
activityNameTextField.leftAnchor.constraint(equalTo: self.safeAreaLayoutGuide.leftAnchor, constant: 16.0).isActive = true
activityNameTextField.topAnchor.constraint(equalTo: self.safeAreaLayoutGuide.topAnchor, constant: 10.0).isActive = true
activityNameTextField.bottomAnchor.constraint(equalTo: self.safeAreaLayoutGuide.bottomAnchor, constant: -10.0).isActive = true
activityNameTextField.rightAnchor.constraint(equalTo: addButton.safeAreaLayoutGuide.leftAnchor, constant: -20.0).isActive = true
addSubview(activityNameLabel)
activityNameLabel.leftAnchor.constraint(equalTo: self.safeAreaLayoutGuide.leftAnchor, constant: 16.0).isActive = true
activityNameLabel.rightAnchor.constraint(equalTo: self.safeAreaLayoutGuide.rightAnchor, constant: -16.0).isActive = true
activityNameLabel.topAnchor.constraint(equalTo: self.safeAreaLayoutGuide.topAnchor, constant: 10.0).isActive = true
activityNameLabel.bottomAnchor.constraint(equalTo: self.safeAreaLayoutGuide.bottomAnchor, constant: -10.0).isActive = true
}
@objc func addButtonTapped() {
guard let validatedText = activityNameTextField.text?.trimmingCharacters(in: .whitespacesAndNewlines), !validatedText.isEmpty else {
return
}
displayActivityNameLabel(with: validatedText)
}
func displayActivityNameLabel(with text: String) {
activityNameLabel.text = text
activityNameLabel.isHidden = false
activityNameTextField.isHidden = true
print(activityNameLabel.text)
}
}
class QuickLogViewController: UIViewController {
let screenSize = UIScreen.main.bounds.size
var createActivityView: CreateActivityView!
override func viewDidLoad() {
super.viewDidLoad()
title = "Quick Log"
setupView()
}
func setupView() {
initializeCreateActivityView()
self.view.addSubview(createActivityView)
createActivityView.leftAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.leftAnchor).isActive = true
createActivityView.rightAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.rightAnchor).isActive = true
createActivityView.topAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.topAnchor).isActive = true
createActivityView.heightAnchor.constraint(equalToConstant: 50.0).isActive = true
}
func initializeCreateActivityView() {
createActivityView = CreateActivityView()
createActivityView.frame = CGRect(x: 0, y: 0, width: screenSize.width, height: 50.0)
createActivityView.translatesAutoresizingMaskIntoConstraints = false
createActivityView.activityNameTextField.delegate = self
}
func enableCancelButton() {
navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .cancel, target: self, action: #selector(cancelButtonPressed))
}
}
I added my CreateActivityView to my view controller. 我将CreateActivityView添加到了视图控制器中。 The button target is handled by my createActvitiyView.
按钮目标由我的createActvitiyView处理。 So how can I access the rightbarbuttonitem from the subview?
那么如何从子视图访问rightbarbuttonitem?
You can try to use delegate 您可以尝试使用委托
class CreateActivityView: UIView {
weak var delegate:VCName?
and 和
createActivityView = CreateActivityView()
createActivityView.delegate = self
after that inside any action do 之后在任何动作里面
delegate?.methodInsideTheVC()
Or write button action inside the vc 或在vc内编写按钮动作
createActivityView = CreateActivityView()
createActivityView.button.addTarget(self, action: #selector(addButtonTapped), for: .touchUpInside)
and place 和地方
@objc func addButtonTapped() {
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.