CODEWITHSUNDEEP
iosswift3
forseth31
forseth31

Reputation: 83

How to iterate through all UIButtons on screen in Swift 3.0?

I am trying to do a loop to iterate through all UIButtons found on the view in order to change the position of each button. (See code below)

        for case let button as UIButton in self.view.subviews {
             rect = button.frame
             rect.origin.x = rect.origin.x + 20
             rect.origin.y = rect.origin.y + 20
             button.frame = rect
        }

However, when I debugged the code I found that the loop is not finding any buttons, and thus the positions remained the same. I have 9 buttons in a View found in the View Controller.

Anyone knows what's wrong with this loop?

Upvotes: 2

Views: 1264

Answers (2)

shallowThought
shallowThought

Reputation: 19602

Your code is working. This:

var view = UIView()
view.addSubview(UIView())
view.addSubview(UIButton())

for case let button as UIButton in view.subviews {
    print(button)
}

prints:

<UIButton: 0x7fcc9bd07320; frame = (0 0; 0 0); opaque = NO; layer = <CALayer: 0x60000002dca0>>

Conclusion: self.view.subviews does not contain any UIButtons.

Upvotes: 0

matt
matt

Reputation: 534885

Your code works fine for me. The implication is that your buttons are not subviews of self.view, but subviews of some view further down the hierarchy. You will have to write a recursive version of your loop.

For example:

func lookForButton(_ v: UIView) {
    let subs = v.subviews
    if subs.count == 0 {return}
    for vv in subs {
        if vv is UIButton {
            print(vv) // just testing: do your real stuff here
        }
        lookForButton(vv)
    }
}
lookForButton(self.view)

Upvotes: 4

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