Cant get access to an object's values of a cell in TableView [Swift] - swift

Question

I created a class called BlogPost and a tableView. The tableView get filled with many cells and each cell presents the data of a different user (a blogPost object). In each cell there's a button with a phone icon and I want that everytime the user presses on the phone button in each cell, it will call the number of the specific object in that cell. The problem is that in the button function there is no access to the objects value. The line:
var num = blogPost.phone
works inside the setBlogPost function, but not in the button function outside the setBlogPost function :
#IBAction func whatsAppButton(_ sender: Any) {
//doesnt work
var num = blogPost.phone
openWhatsapp(number: num)
}
num gets an error of "Use of unresolved identifier 'blogPost'.
Full code:
import UIKit
class Tavla: UITableViewCell {
#IBOutlet weak var nameLabelTavla: UILabel!
#IBOutlet weak var locationButtonTavla: UIButton!
#IBOutlet weak var phoneButtonTavla: UIButton!
fileprivate let application = UIApplication.shared
func setBLogPost(blogPost: BlogPost) {
nameLabelTavla.text = blogPost.name
if blogPost.elsertext != "" {
locationButtonTavla.backgroundColor = UIColor(red: 135/255, green: 197/255, blue: 113/255, alpha: 0.5)
locationButtonTavla.setTitle("", for: .normal)
}
else{
}
//num works fine
var num = blogPost.phone
}
#IBAction func whatsAppButton(_ sender: Any) {
//num gets an error of "Use of unresolved identifier 'blogPost'
var num = blogPost.phone
openWhatsapp(number: num)
}
func openWhatsapp(number: String){
let urlWhats = "whatsapp://send?phone=\(number)&abid=12354&text=לעדכן מיקום באפליקציה"
if let urlString = urlWhats.addingPercentEncoding(withAllowedCharacters: NSCharacterSet.urlQueryAllowed) {
if let whatsappURL = URL(string: urlString) {
if UIApplication.shared.canOpenURL(whatsappURL) {
UIApplication.shared.open(whatsappURL)
} else {
print("Install Whatsapp")
}
}
}
}
}

Answer 1

Make num a member var:
class Tavla: UITableViewCell {
var num: Int?
// ...
func setBLogPost(blogPost: BlogPost) {
// ...
num = blogPost.phone
}
#IBAction func whatsAppButton(_ sender: Any) {
guard let num = num else { return }
openWhatsapp(number: num)
}

Answer 2

assign the blogPost id to button tag like
button.tag = post.id
in CellForItemAt function, Now you have reference to the blogpost.You can get the clicked blogpost using the button tag like this
#IBAction func whatsAppButton(_ sender: Any) {
let post = blogPostsArray.filter({$0.id == sender.tag})[0]
var num = post.phone
openWhatsapp(number: num)
}

Answer 3

You just set num value in setBlog method as an inner variable. Then num variable can only access the setBlog method. And blogPost object can accessible on setBlog method, not in another method in this class. If you need to access blogPost object in this class then you need to maintain a variable in this class.
Like this:
class Tavla: UITableViewCell {
var blogPost: BlogPost?
...
func setBLogPost(blogPost: BlogPost) {
self.blogPost = blogPost
....
//num works fine
var num = blogPost.phone // because it's access the param value
}
#IBAction func whatsAppButton(_ sender: Any) {
// Now can access the blogPost variable on this class
if let num = self.blogPost?.phone {
openWhatsapp(number: num)
}
}
}
Now the blogPost object can be accessible in whatsAppButton method.