Swift 在炉中的图像和活力

我在这里遗漏了一些东西。我在Interface Builder中工作很活跃。我可以使用NSImage.draw rect在NSView中绘制图像。因此图像加载正确。然而，当我把它放进加莱尔的时候，它并没有出现。 我是否错过了NSView上关于行为的内容？卡拉耶？层托管？还是别的什么

以下是视图的代码：

import Foundation
import AppKit
import QuartzCore

@IBDesignable public class CircularImageView: NSView {
    var imageLayer: CALayer?

    @IBInspectable public var edgeInset: CGFloat = 10

    public var image: NSImage? {
        didSet {
            if let newImage = image {
                imageLayer?.contents = newImage
            }
        }
    }

    // MARK: New in this class

    private func prepareLayer() {
        self.layer = CALayer()
        self.wantsLayer = true
    }

    private func drawImage() {
        // What am I doing wrong here?
        var newImageLayer = CALayer()
        newImageLayer.contentsGravity = kCAGravityResizeAspect
        if let imageToSet = image {
            newImageLayer.contents = imageToSet
        }
        let insetBounds = CGRectInset(self.bounds, edgeInset, edgeInset)
        newImageLayer.frame = insetBounds
        newImageLayer.backgroundColor = NSColor(calibratedWhite: 0.8, alpha: 1).CGColor
        self.layer!.addSublayer(newImageLayer)
        imageLayer = newImageLayer
    }

    private func test(){
        image?.drawInRect(self.bounds)
    }

    // MARK: NSView stuff

    public override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        prepareLayer()
    }

    public required init?(coder: NSCoder) {
        super.init(coder: coder)
        prepareLayer()
    }

    public override func viewWillDraw() {
        super.viewWillDraw()

        drawImage()
    }

    public override func prepareForInterfaceBuilder() {
        super.prepareForInterfaceBuilder()
        // Load default test image.
        println("\(self): prepareForInterfaceBuilder")
        let processInfo = NSProcessInfo.processInfo()
        let environment = processInfo.environment
        let projectSourceDirectories : AnyObject = environment["IB_PROJECT_SOURCE_DIRECTORIES"]!
        let directories = projectSourceDirectories.componentsSeparatedByString(":")

        if directories.count != 0 {
            let firstPath = directories[0] as! String
            let imagePath = firstPath.stringByAppendingPathComponent("CircularView/Bz1dSvR.jpg")

            let image = NSImage(contentsOfFile: imagePath)
            image!.setName("Test Image")
            self.image = image
        }
    }
}

---

提前谢谢。

好了，伙计们，我找到答案了。 我在这段代码中做错了两件事。我正在处理一个层托管视图，我只需要一个层备份视图。我不知道有什么不同。在将NSImage添加到CALayer的内容之前，我需要使用lockFocus（）和unlockFocus（）来接受它

以下是解决此问题的完整代码

import Foundation
import AppKit

@IBDesignable public class CircularImageView: NSView {
    var imageLayer: CALayer?

    @IBInspectable public var edgeInset: CGFloat = 10

    public var image: NSImage? {
        didSet {
            if let newImage = image {
                imageLayer?.contents = newImage
            }
        }
    }

    // MARK: New in this class

    private func prepareLayer() {
        // I had to remove my own created layer.
        self.wantsLayer = true
    }

    private func drawImage() {
        var newImageLayer = CALayer()
        newImageLayer.contentsGravity = kCAGravityResizeAspect
        if let imageToSet = image {
            // I didn't lock the focus on the imageToSet.
            imageToSet.lockFocus()
            newImageLayer.contents = imageToSet
            // I didn't unlock the focus either.
            imageToSet.unlockFocus()
        }
        let insetBounds = CGRectInset(self.bounds, edgeInset, edgeInset)
        newImageLayer.frame = insetBounds
        newImageLayer.backgroundColor = NSColor(calibratedWhite: 0.8, alpha: 1).CGColor
        self.layer!.addSublayer(newImageLayer)
        imageLayer = newImageLayer
    }

    // MARK: NSView stuff

    public override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        prepareLayer()
    }

    public required init?(coder: NSCoder) {
        super.init(coder: coder)
        prepareLayer()
    }

    public override func viewWillDraw() {
        super.viewWillDraw()

        drawImage()
    }

    public override func prepareForInterfaceBuilder() {
        super.prepareForInterfaceBuilder()
        // Load default test image.
        println("\(self): prepareForInterfaceBuilder")
        let processInfo = NSProcessInfo.processInfo()
        let environment = processInfo.environment
        let projectSourceDirectories : AnyObject = environment["IB_PROJECT_SOURCE_DIRECTORIES"]!
        let directories = projectSourceDirectories.componentsSeparatedByString(":")

        if directories.count != 0 {
            let firstPath = directories[0] as! String
            let imagePath = firstPath.stringByAppendingPathComponent("CircularView/Bz1dSvR.jpg")

            let image = NSImage(contentsOfFile: imagePath)
            image!.setName("Test Image")
            self.image = image
        }
    }
} 

---

你能解释一下这句话吗：

让myLayer=CALayer（）

？您正在创建一个CALayer，然后立即将其丢弃。这应该是self.layer=CALayer（），谢谢，但仍然不起作用。好的，请编辑以修复问题中的代码。不要展示糟糕的代码，也不要指望别人读懂你的心思。对不起，我是个不问问题的人。谢谢你的帮助。