在NSTableView中作为复选框的NSButtonCell不会被选中是因为NSButtonCell默认不支持复选框功能。要实现复选框功能,需要自定义NSButtonCell并重写其相关方法。
首先,创建一个继承自NSButtonCell的子类,命名为CheckboxButtonCell。在CheckboxButtonCell类中,重写以下方法:
drawInterior(withFrame:in:controlView:)
:用于绘制复选框按钮的外观。trackMouse(with:in:of:at:untilMouseUp:)
:用于处理鼠标点击事件,实现复选框的选中和取消选中功能。cellSize(forBounds:)
:用于设置复选框按钮的大小。下面是CheckboxButtonCell类的示例代码:
import Cocoa
class CheckboxButtonCell: NSButtonCell {
override func drawInterior(withFrame cellFrame: NSRect, in controlView: NSView) {
let buttonRect = NSRect(x: cellFrame.origin.x + 2, y: cellFrame.origin.y + 2, width: cellFrame.size.width - 4, height: cellFrame.size.height - 4)
let buttonPath = NSBezierPath(rect: buttonRect)
NSColor.white.setFill()
buttonPath.fill()
NSColor.black.setStroke()
buttonPath.lineWidth = 1
buttonPath.stroke()
if self.state == .on {
let checkmarkPath = NSBezierPath()
checkmarkPath.move(to: NSPoint(x: buttonRect.origin.x + 4, y: buttonRect.origin.y + buttonRect.size.height / 2))
checkmarkPath.line(to: NSPoint(x: buttonRect.origin.x + buttonRect.size.width / 2 - 2, y: buttonRect.origin.y + 4))
checkmarkPath.line(to: NSPoint(x: buttonRect.origin.x + buttonRect.size.width - 4, y: buttonRect.origin.y + buttonRect.size.height - 4))
NSColor.black.setStroke()
checkmarkPath.lineWidth = 2
checkmarkPath.stroke()
}
}
override func trackMouse(with event: NSEvent, in cellFrame: NSRect, of controlView: NSView, untilMouseUp flag: Bool) -> Bool {
if self.isEnabled {
self.state = (self.state == .on) ? .off : .on
controlView.needsDisplay = true
}
return true
}
override func cellSize(forBounds rect: NSRect) -> NSSize {
return NSSize(width: 20, height: 20)
}
}
接下来,在使用NSTableView的地方,将对应的列的Cell类型设置为CheckboxButtonCell。可以通过代码或者Interface Builder来实现。
let checkboxColumn = NSTableColumn(identifier: NSUserInterfaceItemIdentifier("CheckboxColumn"))
checkboxColumn.headerCell.title = "Checkbox"
checkboxColumn.dataCell = CheckboxButtonCell()
tableView.addTableColumn(checkboxColumn)
现在,当在NSTableView中点击复选框按钮时,复选框将会被选中或取消选中,并且外观也会相应改变。
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