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…
但是,除非我放大或缩小PDF页面,否则它不起作用…
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drawPage：toContext：但是绘图代码在drawPage：toContext中不起作用：
- (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.
解决方法
我遇到了同样的麻烦.我第一次添加注释时,PDFView会立即在页面上显示该注释.从那时起,添加或删除注释在代码中工作正常但PDFView在我手动滚动视图之前不会显示更改.
从PDFKit我尝试过：
previewView.layoutDocumentView()
for pageIndex in 0...pdf.pageCount - 1 {
let page = pdf.page(at: pageIndex)!
previewView.annotationsChanged(on: page)
}
从NSView我尝试过：
previewView.needsDisplay = true previewView.needsLayout = true previewView.documentView?.needsDisplay = true previewView.updateLayer()