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,它按我的意愿绘制我的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,它就会消失.我现在一直在寻找安静,但是无法弄清楚为什么会发生这种情况.我只是希望文本始终可见,而不是淡入淡出.
它与我正在添加的CALayer有关,以完成我的造型.
每当我在文本字段中从viewDidLoad运行相同的设置时,它就像一个魅力.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
}
}
应该使用draw方法绘制视图而不是设置属性.对于你的问题,不要设置为self.layer直接使用sublayer.
原文链接：https://www.f2er.com/swift/319068.html我对你的代码的建议：
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
}
}
