分段控件，更改色调不透明度，但不更改边框 [英] Segmented control, change tint opacity, but not border

问题描述

在 Swift 中，如何更改所选索引的色调不透明度，而不更改整个控件的边框?

这会改变整个控件的颜色和不透明度:

sessionTypeSegmentedControl.tintColor = UIColor(red: 140/255, green: 140/255, blue: 140/255, alpha: 0.1)

接下来我试过:

sessionTypeSegmentedControl.layer.borderColor = UIColor(red: 0/255, green: 0/255, blue: 0/255, alpha: 1.0).cgColor

但这对边界没有影响.

我想更改此图像中显示的蓝色背景颜色不透明度.在最左边.

In Swift, how do I change the tint opacity of the selected index, but not the border of the whole control?

This changes the color and opacity of the whole control:

sessionTypeSegmentedControl.tintColor = UIColor(red: 140/255, green: 140/255, blue: 140/255, alpha: 0.1)

Followed by this I tried:

sessionTypeSegmentedControl.layer.borderColor = UIColor(red: 0/255, green: 0/255, blue: 0/255, alpha: 1.0).cgColor

But this has no effect on the border.

EDIT:

I want to change the blue background color opacity shown in this image. On the far left.

http://i.stack.imgur.com/GgUwN.png

So the expected result would be:

http://imgur.com/a/AIRhO

解决方案

I found this solution... Swift 3 Xcode 8

    @IBAction func valueChanged(_ sender: UISegmentedControl) {

    for (index,element) in segment.subviews.enumerated() {

        if index != sender.selectedSegmentIndex {
            element.tintColor = UIColor.red
            element.alpha = 0.5
        }else {

            element.tintColor = UIColor.red
            element.alpha = 1

        }
    }



}

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)

    for (index,element) in segment.subviews.enumerated() {

        if index != segment.selectedSegmentIndex {
            element.tintColor = UIColor.red
            element.alpha = 0.5
        }else {

            element.tintColor = UIColor.red
            element.alpha = 1

        }
    }

            segment.layer.cornerRadius = 5
            segment.layer.borderColor = UIColor.black.cgColor
            segment.layer.borderWidth = 1
            segment.clipsToBounds = true



}

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