Changing text of Swift UILabel

I am attempting to learn Apple's Swift. I was recently trying to build a GUI app, but I have a question:

How do I interact with GUI elements of my app? For instance, I used interface builder to make a UILabel, and I connected it to my viewcontroller by control-clicking, so that I get the @IBOUTLET thing. Now, how do I, while in my view controller, edit the text of this UILabel? To state it another way, what code can I use to programatically control the text of something on my storyboard? All methods I have found online only appear to work with a button generated in code, not a button generated on a storyboard.

I've seen code like

self.simpleLabel.text = "message"

If this is right, how do I link it with the label in question? In other words, how do I adapt this code to be connected with the IBOutlet (If that's what I do)

If you've successfully linked the control with an `IBOutlet` on your `UIViewController` class, then the property is added to it and you would simply replace **simpleLabel** with whatever you named your `IBOutlet` connection to be like so:

class MyViewController: UIViewController {
@IBOutlet weak var myLabel: UILabel!
func someFunction() {
self.myLabel.text = "text"
}
}

You may trying to change a UI component not in the main thread, in that case, do this:

DispatchQueue.main.async {
someLabel.text = "Whatever text"
}

The outlet you created must've been named by you. The outlet belongs to your view controller. `self.simpleLabel` means 'fetch the value of *my* property named 'simpleLabel'.

Since different outlets have different names, using `self.simpleLabel` here won't work until your outlet is named 'simpleLabel'. Try replacing 'simpleLabel' with the name you gave to the outlet when you created it.

The correct way now would be:

self.yourLabelName.text = "message"

If you have something like this for an IBOutlet:

@IBOutlet var someLabel: UILabel!

then you could set the text property just like in your example:

someLabel.text = "Whatever text"

If you're having problems with this, perhaps you're not assigning the text property in the right place. If it's in a function that doesn't get called, that line won't execute, and the text property won't change. Try overriding the viewDidLoad function, and put the line in there, like this:

override func viewDidLoad() {
super.viewDidLoad()
someLabel.text = "Whatever text"
}

Then, as soon as the view loads, you'll set the text property. If you're not sure if a line of code is executing or not, you can always put a breakpoint there, or add some output. Something like

println("Checkpoint")

inside a block of code you're unsure about could really help you see when and if it runs.

Hope this helps.