Generate PDF from UIView by rendering looses quality iOS

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Hello I face the same problem as mentioned here: http://stackoverflow.com/questions/7943351/generate-pdf-from-uiview-by-rendering-looses-quality-ios

But to sum it up:

I have a custom UIView called TTT_WantsToBeRazorSharpView. This view does nothing, but draw a text with

NSString*txtPleaseHelp = NSLocalizedString(@"Hello, am I blurry again?",@"");
CGContextShowTextAtPoint(ctx, 10, 50, [txtPleaseHelp cStringUsingEncoding:NSMacOSRomanStringEncoding], [txtPleaseHelp length]);

Now the View is drawn three times to an UIViewController (one time in IB) and two times in code with these lines:

TTT_WantsToBeRazorSharpView *customViewSharp = [[TTT_WantsToBeRazorSharpView alloc] initWithFrame:CGRectMake(10,250, 300, 80)];
 [self.view addSubview:customViewSharp];


 TTT_WantsToBeRazorSharpView *customViewBlurryButIKnowWhy = [[TTT_WantsToBeRazorSharpView alloc] initWithFrame:CGRectMake(361.5, 251.5, 301.5, 80.5)];
 [self.view addSubview:customViewBlurryButIKnowWhy];

the first code drawn view is razorsharp, while the second isn't, but that is ok, because of rect's comma values (361.5, 251.5, 301.5, 80.5).

The this picture:

But my problem is now, if I render the view into an pdf document it is blurry! And don't know why, see here:

and the PDF file itself Test.pdf https://raw.github.com/florianbachmann/GeneratePDFfromUIViewButDontWantToLooseQuality/master/Test.pdf

and the lines to render:

//this is blurry, but why?
CGRect customFrame1 = CGRectMake(10,50, 300, 80);
TTT_WantsToBeRazorSharpView *customViewSharp = [[TTT_WantsToBeRazorSharpView alloc] initWithFrame:customFrame1];
CGContextSaveGState(context);
CGContextSetTextMatrix(context, CGAffineTransformIdentity);
CGContextTranslateCTM(context, (int)customFrame1.origin.x, (int)customFrame1.origin.y);
[customViewSharp.layer renderInContext:context];
CGContextRestoreGState(context);