Finding all detailDislosureButtons on a view

Question

I'm attempting to find all buttons of a particular type ( detailDisclosure ) on a UIViewController . To find all UIButtons on a view, I'd use the following:

let buttons = view.subviews.filter{$0 is UIButton}

How would I filter by the button type, in this case a detailDisclosure ?

I've tried using UIButtonType w/ raw value of 2 and with UIButtonType.detailDisclosure , but I get a compiler error.

    let buttons = view.subviews.filter{$0 is UIButtonType.detailDisclosure}

Thank you for reading.

Answer 1

In your filter closure you first need to check if each view is a UIButton using the conditional type cast operator ( as? ). If it is a button, you can then check if the buttonType property is .detailDisclosure .

let buttons = view.subviews.filter {
    guard let button = $0 as? UIButton else {
        return false
    }
    return button.buttonType == .detailDisclosure
}

---

For an equivalent single-line solution, you can use optional chaining with the buttonType property, but note that you have to prepend the type onto .detailDisclosure ( UIButtonType ) because it can no longer be inferred.

buttons = view.subviews.filter { ($0 as? UIButton)?.buttonType == UIButtonType.detailDisclosure }

Answer 2

Try this ....

let buttons = view.subviews.filter { (v) -> Bool in
    if let btn = v as? UIButton {
        if btn.buttonType == .detailDisclosure {
            return true
        }
    }
    return false
}

Answer 3

This is swift 2.3 but you can do something like this in your filter method

if buton.buttonType == UIButtonType.DetailDisclosure {

}    

Answer 4

This one is working for me perfectly: (Swift 3)

let buttons = view.subviews.filter{$0 is UIButton}

for btn in buttons as! [UIButton] {
    if btn.buttonType == .detailDisclosure {
        print(bin)
    }
}