PDFView setNeedsDisplay:YES在MacOS Sierra 10.12上不起作用 [英] PDFView setNeedsDisplay:YES doesn't work on MacOS Sierra 10.12
问题描述
我已经使用[PDFView setNeedsDisplay:YES]
来重新绘制PDF视图,并且在OSX 10.9-10.11上效果很好.
但是,除非我放大或缩小PDF页面,否则它将无法正常工作.
I have use [PDFView setNeedsDisplay:YES]
to let the PDF view redraw, and it worked great on OSX 10.9-10.11.
However it doesn't work unless I zoom in or zoom out the PDF page...
还有其他方法可以立即重绘吗?下面的代码:
Is there any other way to redraw immediately? Code below:
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;
更新:
我发现setNeedsDispaly
调用了 drawPage:toContext:
,但是绘图代码在 drawPage:toContext:
I found that the setNeedsDispaly
calls the drawPage:toContext:
however the drawing code doesn't work in drawPage:toContext:
- (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];
}
调试提示CGContextSetFillColorWithColor: invalid context 0x0
和更多invalid context 0x0
警告.
我在drawPage:toContext:
中所做的是测试,仅使用BezierPath画一条线.
the debug said CGContextSetFillColorWithColor: invalid context 0x0
and more invalid context 0x0
warnings.
What I do in the drawPage:toContext:
is testing and just use BezierPath to draw a line.
推荐答案
我遇到了同样的麻烦.第一次添加注释时,PDFView
会立即在页面上显示该注释.从那时起,添加或删除批注在代码中就可以正常工作,但是PDFView
在我手动滚动视图之前不会显示更改.
I'm having the same trouble. The first time I add an annotation, PDFView
displays that annotation on the page immediately. From then on, adding or removing an annotation works fine in code but PDFView
doesn't show the change until I manually scroll the view.
在PDFKit
中,我尝试过:
previewView.layoutDocumentView()
for pageIndex in 0...pdf.pageCount - 1 {
let page = pdf.page(at: pageIndex)!
previewView.annotationsChanged(on: page)
}
,并且从NSView
开始,我尝试过:
and from NSView
I've tried:
previewView.needsDisplay = true
previewView.needsLayout = true
previewView.documentView?.needsDisplay = true
previewView.updateLayer()
但是没有运气.我也尝试过用代码滚动PDFView
,但是它不是偷偷摸摸的可靠方式,通常不应该这样做.
but no luck. I've tried scrolling the PDFView
with code too but it hasn't been a reliable way of sneaking a refresh, and in general shouldn't be the way to do this.
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