UIBarButtonItem: How can I find its frame?

Question

I have a button in a toolbar. How can I grab its frame? Do UIBarButtonItems not have a frame property?

Answer 1

Here's what I'm using in iOS 11 & Swift 4. It could be a little cleaner without the optional but I'm playing it safe:

extension UIBarButtonItem {
    var view: UIView? {
        return perform(#selector(getter: UIViewController.view)).takeRetainedValue() as? UIView
    }
}

And usage:

if let barButtonFrame = myBarButtonItem.view?.frame {
    // etc...
}

Answer 2

You should do a loop over the subviews and check their type or their contents for identifying. It is not safe to access view by kvo and you cannot be sure about the index.

Answer 3

You can create a UIBarButtonItem with a custom view, which is a UIButton, then you can do whatever you want. :]

Answer 4

Oof, lots of rough answers in this thread. Here's the right way to do it:

import UIKit

class ViewController: UIViewController {

    let customButton = UIButton(type: .system)

    override func viewDidLoad() {
        super.viewDidLoad()

        customButton.setImage(UIImage(named: "myImage"), for: .normal)
        self.navigationItem.rightBarButtonItem = UIBarButtonItem(customView: customButton)
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        print(self.customButton.convert(self.customButton.frame, to: nil))
    }
}

Answer 5

Check out this answer: How to apply borders and corner radius to UIBarButtonItem? which explains how to loop over subviews to find the frame of a button.

Answer 6

-(CGRect) getBarItemRc :(UIBarButtonItem *)item{
    UIView *view = [item valueForKey:@"view"];
    return [view frame];
}