Question

我使用以下代码将NSTextField子类化：

import Cocoa

class CustomSearchField: NSTextField {
    override func draw(_ dirtyRect: NSRect) {
        self.wantsLayer = true
        let textFieldLayer = CALayer()
        self.layer = textFieldLayer
        self.backgroundColor = NSColor.white
        self.layer?.backgroundColor = CGColor.white
        self.layer?.borderColor = CGColor.white
        self.layer?.borderWidth = 0
        super.cell?.draw(withFrame: dirtyRect, in: self)
    }
}

class CustomSearchFieldCell: NSTextFieldCell {
    override func drawingRect(forBounds rect: NSRect) -> NSRect {
        let minimumHeight = self.cellSize(forBounds: rect).height
        let newRect = NSRect(x: rect.origin.x + 25, y: (rect.origin.y + (rect.height - minimumHeight) / 2) - 4, width: rect.size.width - 50, height: minimumHeight)

        return super.drawingRect(forBounds: newRect)
    }
}

这一切都运行正常，它正如我想的那样绘制我的NSTextField。唯一的问题是，只要我将界面的其他部分作为第一个响应者（在NSTextField外部单击），NSTextField（占位符或填充文本）内的文本就会淡出。一旦我再次点击它，它就会逐渐消失。我现在一直在寻找安静，但是无法弄清楚为什么会这样。我只是希望文本一直可见，而不是淡入淡出。

它与我正在添加的CALayer有关，以完成我的样式。

每当我在文本字段中从viewDidLoad运行相同的设置时，它就像魅力一样。例如：

class ViewController: NSViewController {
    @IBOutlet weak var searchField: NSTextField!

    override func viewDidLoad() {
        initCustomSearchField()
    }

    private func initCustomSearchField() {
        searchField.wantsLayer = true
        let textFieldLayer = CALayer()
        searchField.layer = textFieldLayer
        searchField.backgroundColor = NSColor.white
        searchField.layer?.backgroundColor = CGColor.white
        searchField.layer?.borderColor = CGColor.white
        searchField.layer?.borderWidth = 0
        searchField.delegate = self
    }
}

Answer 1

draw方法应该用于绘制视图而不是设置属性。对于您的问题，请不要直接使用sublayer设置为self.layer。

我对您的代码的建议：

class CustomTextField :NSTextField {

    override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)

        setupView()
    }

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

    func setupView(){
        textColor = .green
    }
}

class CustomTextFieldCell: NSTextFieldCell {

    override init(textCell string: String) {
        super.init(textCell: string)
        setupView()
    }

    required init(coder: NSCoder) {
        super.init(coder: coder)

        setupView()
    }

    func setupView(){
        backgroundColor = .red
    }


    override func drawingRect(forBounds rect: NSRect) -> NSRect {
        let newRect = NSRect(x: (rect.width - rect.width/2)/2, y: 0, width: rect.width/2, height: 20)
        return super.drawingRect(forBounds:newRect)
    }

    override func draw(withFrame cellFrame: NSRect, in controlView: NSView) {
        super.draw(withFrame: cellFrame, in: controlView)
        controlView.layer?.borderColor = NSColor.white.cgColor
        controlView.layer?.borderWidth = 2
    }

}

NSTextField在子类化后淡出

1 个答案: