Refresh Current View Controller Data Request when XIB Button Clicked - ios

Question

I want to make error handling pages to all of my view controller through, so when error fetching data error, it's not only showing dialog, but showing a XIB files that contain error message and button to refresh. Like this:
Here's the XIB Class code:
import UIKit
class ErrorMessage: UIView {
#IBOutlet weak var imageViewError: UIImageView!
#IBOutlet weak var labelError: UILabel!
#IBOutlet weak var buttonTryAgain: UIButton!
static var message: String?
override func awakeFromNib() {
labelError.text = ErrorMessage.message
}
#IBAction func didTapTryAgain(_ sender: Any) {
Dialog.showProgressDialog(info: "")
}
}
Here's my base controller code, who handling all the problem.
import Foundation
class BaseViewController: UIViewController {
var uiView = UIView();
override func viewDidLoad() {
}
func getErrorMessage(message:String) {
super.viewDidLoad()
ErrorMessage.message = message
guard let viewErrorMessage = Bundle.main.loadNibNamed("ErrorMessage", owner: self, options: nil)?.first as? ErrorMessage else { return}
self.view.addSubview(viewErrorMessage)
}
}
And here's how I call it in another class which I extend BaseViewController, so it can show the error problem globally, without I redeclared again the class:
func onFailedDeleteCart(errorMessage: String) {
getErrorMessage(message: errorMessage)
}
Right now I can pass the error message.
The problem is, I want the Refresh button refreshing current View Controller when I click it. Maybe calling current View Controller's viewDidLoad when I click it will be the nice logic but I don't know how to implement it in XIB class. Anyone can solve out this? Thank you!

Answer 1

Approach: 1
Step:1 Create closure for callback
typealias RefreshBlock = (()->())?
Step:2 Define closure in your UIView class
Step:3 Call closure if user tap refresh button
class ErrorMessage: UIView {
#IBOutlet weak var imageViewError: UIImageView!
#IBOutlet weak var labelError: UILabel!
#IBOutlet weak var buttonTryAgain: UIButton!
var refreshBlock:RefreshBlock!
static var message: String?
override func awakeFromNib() {
labelError.text = ErrorMessage.message
}
// Step : 3
#IBAction func didTapTryAgain(_ sender: UIButton) {
refreshBlock!()
}
}
Step:4 Assign value in closure when addSubview called
class BaseViewController: UIViewController {
override func viewDidLoad() {
}
func getErrorMessage(message:String) {
super.viewDidLoad()
ErrorMessage.message = message
guard let viewErrorMessage = Bundle.main.loadNibNamed("ErrorMessage", owner: self, options: nil)?.first as? ErrorMessage else { return}
viewErrorMessage.refreshBlock = {()
self.viewDidLoad()
print("Refresh Contents")
}
self.view.addSubview(viewErrorMessage)
}
}
Approach: 2
Pass your current UIViewController Reference into UIView class. Refer below code.
class ErrorMessage: UIView {
#IBOutlet weak var imageViewError: UIImageView!
#IBOutlet weak var labelError: UILabel!
#IBOutlet weak var buttonTryAgain: UIButton!
var currentVC:UIViewController!
static var message: String?
override func awakeFromNib() {
labelError.text = ErrorMessage.message
}
#IBAction func didTapTryAgain(_ sender: UIButton) {
currentVC.viewDidLoad()
}
}
class BaseViewController: UIViewController {
override func viewDidLoad() {
}
func getErrorMessage(message:String) {
super.viewDidLoad()
ErrorMessage.message = message
guard let viewErrorMessage = Bundle.main.loadNibNamed("ErrorMessage", owner: self, options: nil)?.first as? ErrorMessage else { return}
viewErrorMessage.currentVC = self
self.view.addSubview(viewErrorMessage)
}
}