CODEWITHSUNDEEP
swiftmacosuser-interface
Jonathan
Jonathan

Reputation: 99

Swift Changing Dynamically Created Label

I have a program that needs to create dynamic tabs, and in each tab put a relevant data to that tab. For testing purposes, I've tried to make a program that creates 1 tab dynamically and should display relevant data by calling a function. It has 2 classes: TabsController which is hooked up to the Tab Controller on the stoty board, and PageController which is the class that should make the dynamic tabs.

The problem is, I do manage to make the dynamic page, but trying to update the label text doesn't update it - it stays with the "Test" value. I probably mess something up with the pages life cycles, but I can't understand what.

TabsController:

import Cocoa

class TabsController: NSTabViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func viewWillAppear() {
        super.viewWillAppear()
        let page1 = PageController()
        page1.changePageNum("1")
        self.addChildViewController(page1)
    }
}

PageController:

import Cocoa

class PageController: NSViewController {
    var lblHeader = NSTextField(frame: NSMakeRect(20, 20, 120, 20))

    override func viewDidLoad() {
        super.viewDidLoad()
        self.lblHeader.stringValue = "Test"
        self.view.addSubview(self.lblHeader)

    }

    func changePageNum(_ pageNum: String) {
        self.title = "Page \(pageNum)"
        self.lblHeader.stringValue = "Page \(pageNum)"
    }
}

And while I'm on that, I'm having a really hard time finding literature for mac os swift programming. Usually what I find is for ObjC or iOS oriented. Anyone knows a good source for this?

Thanks.

Upvotes: 1

Views: 125

Answers (1)

Oskar
Oskar

Reputation: 3702

You are allocating a new PageController every time your view appears. You'll eventually end up with hundreds of PageControllers. Allocate it as a variable instead and add it as child in viewDidLoad:

class TabsController: NSTabViewController {
    var pageController = PageController()

    override func viewDidLoad() {
        super.viewDidLoad()
        pageControler.changePageNum("1")
        self.addChildViewController(page1)
    }
}

Ray Wenderlich has good Swift literature: https://store.raywenderlich.com/

Upvotes: 1

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