Clear NSView programmatically in swift

Question

I have a NSView connected to a custom class.
There's some drawing on that view:

class LineDrawer: NSView {
    var linear = NSBezierPath()
    var storage = NSUserDefaults.standardUserDefaults()

    override func drawRect(dirtyRect: NSRect) {
        var color = NSColor()

        if let newLoadedData = storage.objectForKey("color") as? NSData {
            if let currentColor = NSUnarchiver.unarchiveObjectWithData(newLoadedData) as? NSColor {
                color = currentColor
            }
        }

        color.set()
        linear.lineWidth = CGFloat(storage.integerForKey("width"))
        linear.stroke()
    }

    override func mouseDown(theEvent: NSEvent) {
        super.mouseDown(theEvent)
        let location = theEvent.locationInWindow
        var lastPt = theEvent.locationInWindow
        lastPt.y -= frame.origin.y
        linear.moveToPoint(lastPt)
    }

    override func mouseDragged(theEvent: NSEvent) {
        super.mouseDragged(theEvent)
        var newPt = theEvent.locationInWindow
        newPt.y -= frame.origin.y
        linear.lineToPoint(newPt)
        needsDisplay = true
    }
}

And now I need to write a function to completely clear that view.

Daniel Farrell · Accepted Answer · 2015-01-31T16:05:58.320

2

Not too sure what you mean by completely clear that view but can't you just fill it with a solid colour?

[[NSColor windowBackgroundColor] setFill];
NSRectFill(self.bounds);

(Not up to speed with the Swift hotness yet)

update I improving my Swift chops behold!

NSColor.windowBackgroundColor().setFill()
NSRectFill(self.bounds)

edited Jan 31 '15 at 16:05

answered Jan 31 '15 at 12:18

Daniel Farrell

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Thanks, I was looking for a way to remove drawing, but this will be good too. – pomo_mondreganto Jan 31 '15 at 13:29
Yes, you can't remove drawing once it is applied. An alternative is to set a flag on your classes which turns specific drawing on or off and tell the the view to `setNeedsDisplay:YES`. On the next pass through the view will be blank and if no additional drawing is required none will be done. This is more efficient than doing the drawing every time then erasing it with the rect fill. – Daniel Farrell Jan 31 '15 at 16:02

score 0 · Answer 2 · answered Jun 22 '17 at 05:52

0

Something like this should suffice. I used something like this in my project to clear NSView.

while curView.subviews.count > 0 {
   curView.subviews.last?.removeFromSuperview()
}

answered Jun 22 '17 at 05:52

XueYu

2,355
29
33

score 0 · Answer 3 · answered Jan 18 '19 at 18:07

0

Swift 4.2 solution:

myView.subviews.removeAll()

answered Jan 18 '19 at 18:07

ixany

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65

Clear NSView programmatically in swift

3 Answers3

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