objective-c – PDFView setNeedsDisplay：YES在MacOS Sierra 10.12上不起作用

我使用[PDFView setNeedsDisplay：YES]让PDF视图重绘,它在OSX 10.9-10.11上运行良好.
但是,除非我放大或缩小PDF页面,否则它不起作用… @H_673_20@ @H_673_20@还有其他方法可以立即重绘吗？代码如下：

@H_673_20@

NSRect      newBounds;
NSRect      currentBounds;
NSRect      dirtyRect;
NSPoint     mouseLoc;
NSPoint     endPt;

// Where is Annotation Now?
currentBounds = [_activeAnnotation bounds];

// Mouse in display view coordinates.
mouseLoc = [self convertPoint: [theEvent LOCATIOnInWindow] fromView: NULL];

// Convert end point to page space.
if(activePage == nil)
    activePage =[_activeAnnotation page];

_LinePoint= [self convertPoint: mouseLoc toPage: activePage];
endPt = [self convertPoint: mouseLoc toPage: activePage];
if(_SELEctedIdx == 3) //ink
{
    [(PDFAnnotationInk*)_activeAnnotation removeBezierPath:_path];

    //endPt.x=_xPoint.x; //竖线
    //endPt.y=_xPoint.y; //横线

    [_path lineToPoint:endPt];  //  普通笔

    [(PDFAnnotationInk*)_activeAnnotation addBezierPath:_path];

    [self AnnotationChanged];
    [self setNeedsDisplay:YES];

    return;

@H_673_20@更新：

@H_673_20@我发现setNeedsDispaly调用drawPage：toContext：但是绘图代码在drawPage：toContext中不起作用：

@H_673_20@

- (void)drawPage:(PDFPage *)pdfPage toContext(CGContextRef)context
{
    [super drawPage: pdfPage toContext:context];
    NSBezierPath *line=[NSBezierPath bezierPath];
    [line moveToPoint:_xPoint];
    [line lineToPoint:NsmakePoint(150,150)];
    [[NSColor redColor] set];
    [line setLineWidth:50] ;
    [line stroke];
}

@H_673_20@调试说CGContextSetFillColorWithColor：无效的上下文0x0和更多无效的上下文0x0警告.
我在drawPage中做了什么：toContext：正在测试并且只是使用BezierPath来绘制一条线.

previewView.layoutDocumentView()

for pageIndex in 0...pdf.PageCount - 1 {
  let page = pdf.page(at: pageIndeX)!
  previewView.AnnotationsChanged(on: pagE)
}

previewView.needsDisplay = true
previewView.needsLayout = true
previewView.documentView?.needsDisplay = true
previewView.updateLayer()