UIVisualEffectView上的角半径

Question

我想知道是否可以在UIVisualEffectView上设置角半径？这是我尝试过的代码:

@IBOutlet var blurView: UIVisualEffectView!

var blurLayer : CALayer{
    return blurView.layer
}
override func viewDidLoad() {
    super.viewDidLoad()
    setUpLayer()
    // Do any additional setup after loading the view.
}

func setUpLayer(){
    blurLayer.cornerRadius = 50
}

和

@IBOutlet var blurView: UIVisualEffectView!

override func viewDidLoad() {
    super.viewDidLoad()
    blurView.layer.cornerRadius = 50
    // Do any additional setup after loading the view.
}

不是他们的作品.

Answer 1

在@theMonster建议之后,我发布了什么是评论.

override func viewDidLoad() {
    super.viewDidLoad()
    blurView.layer.cornerRadius = 50
    blurView.clipsToBounds = true
}

Answer 2

在情节提要中的用户定义的运行时属性中添加两个参数，layer.cornerRadius = 8并layer.masksToBounds = true

或用代码

@IBOutlet var blurView: UIVisualEffectView! {
    didSet {
        blurView.layer.cornerRadius = 8
        blurView.layer.masksToBounds = true
    }
}

Answer 3

子类 UIVisualEffectView

class PSORoundedVisualEffectView : UIVisualEffectView{

    override func layoutSubviews() {
        super.layoutSubviews()
        updateMaskLayer()
    }

    func updateMaskLayer(){
        let shapeLayer = CAShapeLayer()
        shapeLayer.path = UIBezierPath(roundedRect: self.bounds, cornerRadius: 10).CGPath
        self.layer.mask = shapeLayer
    }
}

用你想要的任何形状替换 UIBezierPath。

Answer 4

现有的所有解决方案都不是完美的。

由于UIVisualEffectView通过组合两个子视图内容来实现其视觉效果-一个是背景视图，另一个是滤镜视图，因此当您通过掩盖整个效果来实现拐角半径时，UIVisualEffectView拐角周围会出现一些肮脏的颜色。

要摆脱这些肮脏的颜色，您只需要遮盖UIVisualEffects的滤镜视图即可。

private typealias ObjcRawUIVisualEffectViewSelCGRect =
    @convention(c) (UIVisualEffectView, Selector, CGRect) -> Void

private var cornerRadiusKey =
"com.WeZZard.Waxing.UIVisualEffectView-CornerRadius.cornerRadius"

private var needsUpdateMaskLayerKey =
"com.WeZZard.Waxing.UIVisualEffectView-CornerRadius.needsUpdateMaskLayer"

extension UIVisualEffectView {
    public var cornerRadius: CGFloat {
        get {
            if let storedValue = objc_getAssociatedObject(self,
                &cornerRadiusKey)
                as? CGFloat
            {
                return storedValue
            }
            return 0
        }
        set {
            if cornerRadius != newValue {
                objc_setAssociatedObject(self,
                    &cornerRadiusKey,
                    newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
                setNeedsUpdateMaskLayer()
            }
        }
    }

    private var needsUpdateMaskLayer: Bool {
        get {
            if let storedValue = objc_getAssociatedObject(self,
                &needsUpdateMaskLayerKey)
                as? Bool
            {
                return storedValue
            }
            return false
        }
        set {
            objc_setAssociatedObject(self,
                &needsUpdateMaskLayerKey,
                newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
        }
    }


    public override class func initialize() {
        swizzle_setBounds()
    }

    private class func swizzle_setBounds() {
        struct Static {
            static var token: dispatch_once_t = 0
        }

        dispatch_once(&Static.token) {
            let selector: Selector = "setBounds:"

            let method = class_getInstanceMethod(self, selector)

            let imp_original = method_getImplementation(method)

            before_setBounds = unsafeBitCast(imp_original,
                ObjcRawUIVisualEffectViewSelCGRect.self)

            class_replaceMethod(self,
                selector,
                unsafeBitCast(after_setBounds, IMP.self),
                "@:{_struct=CGRect}")
        }
    }

    private func setNeedsUpdateMaskLayer() {
        needsUpdateMaskLayer = true
        NSOperationQueue.mainQueue().addOperationWithBlock { [weak self] _ in
            self?.updateMaskLayerIfNeeded()
        }
    }

    private func updateMaskLayerIfNeeded() {
        if needsUpdateMaskLayer {
            updateMaskLayer()
            needsUpdateMaskLayer = false
        }
    }

    private func updateMaskLayer(){
        var filterViewFound = false
        for each in subviews {
            if each.dynamicType.description()
                .containsString("Filter")
            {
                filterViewFound = true
                let newPath = UIBezierPath(roundedRect: each.bounds,
                    cornerRadius: self.cornerRadius)
                    .CGPath
                if let existedMask = each.layer.mask
                    as? CAShapeLayer
                {
                    existedMask.path = newPath
                } else {
                    let shapeLayer = CAShapeLayer()
                    shapeLayer.path = newPath
                    each.layer.mask = shapeLayer
                }
            } else {
                setNeedsUpdateMaskLayer()
            }
        }
        assert(filterViewFound == true, "Filter view was not found! Check your hacking!")
    }
}

private var before_setBounds: ObjcRawUIVisualEffectViewSelCGRect = { _ in
    fatalError("No implementation found")
}

private let after_setBounds: ObjcRawUIVisualEffectViewSelCGRect = {
    (aSelf, selector, bounds) -> Void in

    let oldBounds = aSelf.bounds

    before_setBounds(aSelf, selector, bounds)

    if oldBounds.size != bounds.size {
        aSelf.setNeedsUpdateMaskLayer()
    }
}

一切都完成了！