使用nsbezierpath addClip-如何反转夹

Question

使用nsbezierpath addClip仅限制用于剪辑的路径内部。我想做相反的事情 - 只在外面画。

- (void)drawRect:(NSRect)dirtyRect {
    NSBezierPath *dontDrawInThis = ...;
    //We want an opposite mask of [dontDrawInThis setClip];
    //Drawing comes here
}

Answer 1

这是我的解决方案：

- (void)drawRect:(NSRect)dirtyRect {
    NSBezierPath *dontDrawInThis = ...;
    // The mask is the whole bounds rect, subtracted dontDrawInThis
    NSBezierPath *clip = [NSBezierPath bezierPathWithRect:self.bounds];
    [clip appendBezierPath:dontDrawInThis.bezierPathByReversingPath];
    [clip setClip];
    //Drawing comes here
}

对于iOS，用cgrect替换nsRect。

Answer 2

@avishic的答案的迅速版本

override func draw(_ dirtyRect: NSRect) {
    super.draw(dirtyRect)
    let restrictedPath = NSBezierPath()
    // fill the restricted path with shapes/paths you want transparent...
    let fullRect = NSBezierPath(rect: self.bounds)
    fullRect.append(restrictedPath.reversed)
    fullRect.setClip()
    NSColor.blue.setFill()
    frame.fill()
}