将UIVisualEffectView添加到按钮

问题描述

我在故事板场景中添加了透明删除UIButton，该场景以图片为背景，并且我为其添加了一些自动布局约束.

我希望按钮背景为UIVisualEffectView，所以我考虑以编程方式将视图添加到按钮所在的位置，然后删除该按钮并将其添加回去，使其位于UIVisualEffectView的顶部.问题1)，这是一个好主意吗?还是应该在视图层次结构中找到位置并将其放置在按钮之前的一级?

到目前为止，这就是我所拥有的.对于UIButton:

@IBOutlet weak var delete: UIButton! {
    didSet {
        let borderAlpha = CGFloat(0.7)
        let cornerRadius = CGFloat(5.0)
        delete.setTitle("Delete", forState: UIControlState.Normal)
        delete.setTitleColor(UIColor.redColor(), forState: UIControlState.Normal)
        delete.backgroundColor = UIColor.clearColor()
        delete.layer.borderWidth = 1.0
        delete.layer.borderColor = UIColor(white: 1.0, alpha: borderAlpha).CGColor
        delete.layer.cornerRadius = cornerRadius
    }
}

和UIVisualEffectView:

override func viewDidLoad() {
    super.viewDidLoad()

    let visualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: .Light))
    visualEffectView.frame = delete.frame
    visualEffectView.bounds = delete.bounds
    view.addSubview(visualEffectView)
}

这会产生一个模糊的视图，与按钮的大小相同，但是它不在按钮的顶部. 问题2)我还需要以某种方式传递自动布局约束吗?

在此先感谢您的帮助.

解决方案

下面是一个简单的示例，您可以使用它来插入具有视觉效果的UIVisualEffectView.

let button = UIButton(frame: CGRect(x: 0, y: 0, width: 500, height: 100))
button.setTitle("Visual Effect", forState: .Normal)

let gradientLayer = CAGradientLayer()
gradientLayer.colors = [UIColor.blueColor().CGColor, UIColor.redColor().CGColor, UIColor.brownColor().CGColor, UIColor.greenColor().CGColor, UIColor.magentaColor().CGColor, UIColor.purpleColor().CGColor, UIColor.cyanColor().CGColor]
gradientLayer.locations = [0.125, 0.25, 0.375, 0.5, 0.625, 0.75, 0.875, 1]
button.layer.insertSublayer(gradientLayer, atIndex: 0)
gradientLayer.frame = button.bounds

let containerEffect = UIBlurEffect(style: .Dark)
let containerView = UIVisualEffectView(effect: containerEffect)
containerView.frame = button.bounds

containerView.userInteractionEnabled = false // Edit: so that subview simply passes the event through to the button

button.insertSubview(containerView, belowSubview: button.titleLabel!)
button.titleLabel?.font = UIFont.boldSystemFontOfSize(30)

let vibrancy = UIVibrancyEffect(forBlurEffect: containerEffect)
let vibrancyView = UIVisualEffectView(effect: vibrancy)
vibrancyView.frame = containerView.bounds
containerView.contentView.addSubview(vibrancyView)

vibrancyView.contentView.addSubview(button.titleLabel!)

这就是我所做的

• 创建一个按钮.
• 创建一个渐变图层并将其添加到按钮的0索引处.
• 创建具有UIBlurEffectDark效果的容器视图.
• 将容器视图添加到按钮.
• 创建具有相同效果的振动视图，并将其添加到上述containerView的contentView中.
• 将标签从按钮移动到动态视图的标题

然后，这是最终结果. titleLabel文本与鲜艳度很好地融合在一起，并具有所应用的效果.

i have a transparent delete UIButton added to a story board scene, which has a picture as a background, and i have added some auto layout constraints to it.

i want the button background to be a UIVisualEffectView so i was thinking of programatically adding the view to where the button is, then removing the button and adding it back so it's on top of the UIVisualEffectView.Question 1) is this a good idea - or should i find the position in the view hierarchy and place it one level before the button?

here's what i have thus far. for the UIButton:

@IBOutlet weak var delete: UIButton! {
    didSet {
        let borderAlpha = CGFloat(0.7)
        let cornerRadius = CGFloat(5.0)
        delete.setTitle("Delete", forState: UIControlState.Normal)
        delete.setTitleColor(UIColor.redColor(), forState: UIControlState.Normal)
        delete.backgroundColor = UIColor.clearColor()
        delete.layer.borderWidth = 1.0
        delete.layer.borderColor = UIColor(white: 1.0, alpha: borderAlpha).CGColor
        delete.layer.cornerRadius = cornerRadius
    }
}

and for the UIVisualEffectView:

override func viewDidLoad() {
    super.viewDidLoad()

    let visualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: .Light))
    visualEffectView.frame = delete.frame
    visualEffectView.bounds = delete.bounds
    view.addSubview(visualEffectView)
}

this produces a blurred view, the same size as the button, but it's not on top of the button. Question 2) do i need to somehow pass the auto layout constraints, too?

thanks in advance for any help.

解决方案

Here is a simple example that you could use in order to insert UIVisualEffectView with vibrancy effect.

let button = UIButton(frame: CGRect(x: 0, y: 0, width: 500, height: 100))
button.setTitle("Visual Effect", forState: .Normal)

let gradientLayer = CAGradientLayer()
gradientLayer.colors = [UIColor.blueColor().CGColor, UIColor.redColor().CGColor, UIColor.brownColor().CGColor, UIColor.greenColor().CGColor, UIColor.magentaColor().CGColor, UIColor.purpleColor().CGColor, UIColor.cyanColor().CGColor]
gradientLayer.locations = [0.125, 0.25, 0.375, 0.5, 0.625, 0.75, 0.875, 1]
button.layer.insertSublayer(gradientLayer, atIndex: 0)
gradientLayer.frame = button.bounds

let containerEffect = UIBlurEffect(style: .Dark)
let containerView = UIVisualEffectView(effect: containerEffect)
containerView.frame = button.bounds

containerView.userInteractionEnabled = false // Edit: so that subview simply passes the event through to the button

button.insertSubview(containerView, belowSubview: button.titleLabel!)
button.titleLabel?.font = UIFont.boldSystemFontOfSize(30)

let vibrancy = UIVibrancyEffect(forBlurEffect: containerEffect)
let vibrancyView = UIVisualEffectView(effect: vibrancy)
vibrancyView.frame = containerView.bounds
containerView.contentView.addSubview(vibrancyView)

vibrancyView.contentView.addSubview(button.titleLabel!)

And, here is what I have done,

• Create a button.
• Create a gradient layer and add it to 0 index of the button.
• Create a container view with effect of UIBlurEffectDark.
• Add the container view to the button.
• Create a vibrancy view with the same effect and add it to the contentView of the above containerView.
• Move the label from button to the vibrancy view's title

And, here is the final result. The titleLabel text blends nicely with vibrancy and the effect applied.

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