How to loop through all UIButtons in my Swift view?

Question

How would I loop through all UIButtons in my view in Swift? I would want to set all the titles to \"\", but my for-loop in Swift is giving an error.

Answer 1

Used some of the offered questions out there and created my own. I believe is the most efficient when you want to programmatically set up the title of various UIButtons(in my case I am building a quiz)

By randomising my array list and with just a for loop I printing the item at index to the button title

for view in self.viewForButtons.subviews{
        if view.isKindOfClass(UIButton)
        {
            let button : UIButton = view as! UIButton
            button.setTitle("item[i]", forState: .Normal)
        }
    }

Answer 2

To add some context for a common use case, suppose the buttons were in a scroll view and you wanted to highlight the tapped button and de-highlight the other buttons. In this situation, you would direct all buttons to one action method:

@objc private func buttonAction(_ button: UIButton) {
    for case let b as UIButton in view.scrollView.subviews {
        if b == button {
            b.setTitleColor(UIColor.green, for: []) // highlight
        } else {
            b.setTitleColor(UIColor.black, for: []) // de-highlight
        }
    }
}

Answer 3

If you have UIView's within self.view then you need to loop through the subviews while searching for UIButton. Using the accepted answer, I made this little function to do so:

Swift 4 + :

func findButton(`in` view: UIView){
    for view in view.subviews as [UIView] {
        if let button = view as? UIButton {
            // Do something with 'button'
        }else{
            // Loop through subview looking for buttons
            findButton(in: view)
        }
    }
}

Usage:

override func viewDidLoad() {
    findButton(in: self.view)
}

Hope this helps!

Answer 4

This code should work:

for view in self.view.subviews as [UIView] {
    if let btn = view as? UIButton {
        btn.setTitleForAllStates("")
    }
}

You need to iterate through the subViews array.

Answer 5

Here's a short way in Swift if you know the subview only has buttons:

myView.subviews.map {
  ($0 as? UIButton)!.enabled = false
}

Answer 6

Swift 4:

let subviewButtons = self.view.subviews.filter({$0.isKind(of: UIButton.self)})

for button in subviewButtons {
    //do something        
}