CODEWITHSUNDEEP
iosswiftuinavigationbaruibarbuttonitemuiwindow
Mano
Mano

Reputation: 740

How to get the frame of UIBarButtonItem with respect to UIWindow in Swift?

I have gone through a lot of SO posts on this topic. But I have a different requirement.

Am working on an App Walkthrough page in my app for which i would like to display some hints over some of the UI objects. I would like to place a UIView above the entire page to blur it out and then display highlighted image and a hint text. For that reason, I need the frame of those objects(for which help is required) with respect to the UIWindow so that i can place another highlighted image exactly above them. I have found the frame of a couple of objects inside the header of a tableview with the following code.

//Hint for expand/collapse arrow
guard let deviceHeaderView: StatusSectionView = tblStatus.headerView(forSection: 0) as? StatusSectionView else {
    //Hide expand/collapse hint objects
}

if let imgExpandCollapseFrame = deviceHeaderView.imgExpandCollapse.superview?.convert(deviceHeaderView.imgExpandCollapse.frame, to: window) {
    print("Frame of imgExpandCollapse.. \(imgExpandCollapseFrame)")

    let xPosition = (imgExpandCollapseFrame.origin.x + (imgExpandCollapseFrame.size.width/2)) - appWalkthroughView.downArrowHintImgView.frame.size.width/2

    let yPosition = (imgExpandCollapseFrame.origin.y + (imgExpandCollapseFrame.size.height/2)) - appWalkthroughView.downArrowHintImgView.frame.size.height/2

    appWalkthroughView.downArrowHintImgView.frame = CGRect(x: xPosition,
                                                           y: yPosition,
                                                           width: appWalkthroughView.downArrowHintImgView.frame.size.width,
                                                           height: appWalkthroughView.downArrowHintImgView.frame.size.height)
}

Similarly, I need to find the frame of the UIBarButtonItem and convert its frame with respect to the UIWindow and display hint image above it.

For that, I have found the frame of the UIBarButtonItem like this,

let leftBarButtonItem = self.navigationItem.leftBarButtonItem!

if let leftBarButtonItemView = leftBarButtonItem.value(forKey: "view") as? UIView {
    print(leftBarButtonItemView.frame)
}

This code just gives the bounds of the bar button item like this.

(0.0, 0.0, 36.0, 44.0)

And i couldn't convert its frame with respect to UIWindow. How can we achieve this?

Upvotes: 1

Views: 2228

Answers (2)

Syed Qamar Abbas
Syed Qamar Abbas

Reputation: 3677

let leftBarButtonItem = self.navigationItem.leftBarButtonItem
        if let leftBarButtonItemView = leftBarButtonItem?.value(forKey: "view") as? UIView {
            //You should ask your window to convert your frame to his frames.
            if let rect = UIApplication.shared.keyWindow?.convert(leftBarButtonItemView.frame, from: nil) {

            }
        }

Upvotes: 1

Lutz
Lutz

Reputation: 1984

You could ask the view to do the conversion for you:

let frameInWindow = leftBarButtonItemView.convert(leftBarButtonItemView.bounds, to: nil)

(convert will use the widow's coordinate system is the target view is nil)

Upvotes: 0

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