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IOS UITabBar selectionIndicatorImage Y position

I have this specification:

enter image description here

But I have this:

enter image description here

I have this code:

self.mTabBar.selectionIndicatorImage = UIImage(named: "footer-blue-line")

How do I set the Y position for selectionIndicatorImage

?

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3 answers


Why don't you use one "selected" image with a blue line under it?



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http://s18.postimg.org/c5bjg501h/line.png



Use the image in the link in place of the "footer".

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Here you go. You just need to set the Tab Bar class for this class in the interface builder

class MyCustomTabBar: UITabBar
{
    var didInit = false
    override func layoutSubviews()
    {
        super.layoutSubviews()

        if didInit == false
        {
            didInit = true
            for subview in subviews {
                // can't hookup to subviews, so do layer.sublayers
                subview.layer.addObserver(self, forKeyPath: "sublayers", options: .New, context: nil)
            }
        }
    }

    deinit
    {
        for subview in subviews
        {
            subview.layer.removeObserver(self, forKeyPath: "sublayers")
        }
    }

    override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>)
    {
        // layer.delegate is usually the parent view
        if let l = object as? CALayer, tbButton = l.delegate as? UIView where tbButton.window != nil
        {
            for v in tbButton.subviews
            {
                if String(v.dynamicType) == "UITabBarSelectionIndicatorView" {
                    v.setYOrigin(3)
                }
            }
        }
    }
}
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