CODEWITHSUNDEEP
iosios7uibarbuttonitemuitoolbaruiappearance
romaonthego
romaonthego

Reputation: 810

Tracking a UIBarButtonItem selected state?

Is there a way to highlight (i.e., toggle) a UIBarButtonItem without using a custom view?

For example, see 3D button from the Maps app:

Maps app

or Shuffle All from the Music app:

Music App

Upvotes: 9

Views: 8361

Answers (3)

Michael Berk
Michael Berk

Reputation: 435

The issue is that wile UIControl has an isSelected property that achieves this goal, UIBarButtonItem doesn't inherit from that, so you can't cast it and set the value. However, there's a strange workaround I discovered. If you set the type for the sender of the button's action as UIControl, it will be treated as a full-blown UIControl, and you can set isSelected.

for example:

    @objc func showContentsView(_ sender: UIControl) { 
        sender.isSelected.toggle()
    }

If you need to toggle the state elsewhere, you can have a variable on your View Controller like this:

var selectedControl: UIControl?

Set the value of selectedControl in your action and set it to nil when unselecting it.

Upvotes: 1

Moose
Moose

Reputation: 2737

item.image = UIImage(named: isSelected ? "SelectedImage" : "NormalImage")

Upvotes: 0

Jeffrey Sun
Jeffrey Sun

Reputation: 8049

You can set the background image of the UIBarButtonItem:

item.setBackgroundImage(UIImage(named: "item-bg.png"), forState: UIControlState.Normal, barMetrics: UIBarMetrics.Default)

Then when you want to de-select it, set the background image to nil:

item.setBackgroundImage(nil, forState: UIControlState.Normal, barMetrics: UIBarMetrics.Default)

(You have to create an image file for the background)

Upvotes: 2

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