CAShapeLayer 问题 - 无法在 nstableview 中绘制

Question

我自定义了一个view-based tableview，在自定义的NSView中，我在init里写：

NSRect testRect = imageViewRect;

CGMutablePathRef roundPath = CGPathCreateMutable();
CGPathAddArc(roundPath, NULL,
             [self arcCenter:testRect].x,
             [self arcCenter:testRect].y,
             ArcRadius,
             2 * M_PI + M_PI_2,
             M_PI_2,
             YES);

self.backgroundLayer = [CAShapeLayer layer];
self.backgroundLayer.frame = testRect;
self.backgroundLayer.path = roundPath;
self.backgroundLayer.strokeColor = [[NSColor blueColor] CGColor];
self.backgroundLayer.fillColor = nil;
self.backgroundLayer.lineWidth = 5.0f;
self.backgroundLayer.lineJoin = kCALineJoinBevel;
[self.layer addSublayer:self.backgroundLayer];
[self.backgroundLayer setFillColor:[NSColor yellowColor].CGColor];

但是图层没有显示出来，真不知道是哪里出了问题。

我在视图中写了这个，然后在 window 中加载视图，图层显示正确。

Answer 1

您是否已将视图 'self' 转换为图层支持视图？你需要说

self.wantsLayer = true

在您可以进行任何与图层相关的操作之前。

引用 documentation-

Setting the value of this property to true turns the view into a layer-backed view—that is, the view uses a CALayer object to manage its rendered content. Creating a layer-backed view implicitly causes the entire view hierarchy under that view to become layer-backed. Thus, the view and all of its subviews (including subviews of subviews) become layer-backed. The default value of this property is false.

CAShapeLayer 问题 - 无法在 nstableview 中绘制

CAShapeLayer problems - not drawing in nstableview

macos

nstableview

cashapelayer