CGContext 期间使用的流行翻译
正如您在下面的代码中看到的，我在编写一些文本之前对 UIView 进行了一些转换。文本的位置似乎受到上述转换的影响。
有没有办法“弹出”这些位移，以便我可以相对于原始 0,0 坐标编写文本？
//turn PDF upsidedown
CGAffineTransform transform = CGAffineTransformIdentity;
transform = CGAffineTransformMakeTranslation(100, aUIView.bounds.size.height+300);
transform = CGAffineTransformScale(transform, 0.5, -0.5);
CGContextConcatCTM(pdfContext, transform);
// Draw view into PDF
// Is renderInContext deprecated? Something to look into.
[aUIView.layer renderInContext:pdfContext];
CGContextSelectFont (pdfContext, "Helvetica", 14, kCGEncodingMacRoman);
CGContextSetTextDrawingMode (pdfContext, kCGTextFill);
CGContextSetRGBFillColor (pdfContext, 0, 0, 0, 1);
CGContextSetTextMatrix(pdfContext, CGAffineTransformMake(1.0,0.0, 0.0, -1.0, 0.0, 0.0));
const char *text = "THE QUICK BROWN FOX JUMPED OVER THE LAZY DOG TEST 1";
CGContextShowTextAtPoint (pdfContext, 10.0, 10.0, text, strlen(text));
As you can see in the code below I do some transformations on my UIView before writing some text. It seems though that the position of the text is affected by the aforementioned transformations.
Is there any way to 'pop' these displacements so I can then write my text in relation to the original 0,0 coordinate?
//turn PDF upsidedown
CGAffineTransform transform = CGAffineTransformIdentity;
transform = CGAffineTransformMakeTranslation(100, aUIView.bounds.size.height+300);
transform = CGAffineTransformScale(transform, 0.5, -0.5);
CGContextConcatCTM(pdfContext, transform);
// Draw view into PDF
// Is renderInContext deprecated? Something to look into.
[aUIView.layer renderInContext:pdfContext];
CGContextSelectFont (pdfContext, "Helvetica", 14, kCGEncodingMacRoman);
CGContextSetTextDrawingMode (pdfContext, kCGTextFill);
CGContextSetRGBFillColor (pdfContext, 0, 0, 0, 1);
CGContextSetTextMatrix(pdfContext, CGAffineTransformMake(1.0,0.0, 0.0, -1.0, 0.0, 0.0));
const char *text = "THE QUICK BROWN FOX JUMPED OVER THE LAZY DOG TEST 1";
CGContextShowTextAtPoint (pdfContext, 10.0, 10.0, text, strlen(text));
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我认为 CGContextSaveGState(cntx) 和 CGContextRestoreGState(cntx) 就是您正在寻找的。
I think CGContextSaveGState(cntx) and CGContextRestoreGState(cntx) are what you are looking for.