i want to create a pdf with a clear (transparent) background, but cannot.
The pdf is created, looks ok, but has a white background.
What am I missing?
Here the code:
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
NSRect rect = NSMakeRect(0,0,99,99);
GmdView *view = [[GmdView alloc] initWithFrame: rect ];
NSData *pdfData = [view dataWithPDFInsideRect:rect];
NSString *path = @"/tmp/a.pdf";
NSError *outError;
BOOL ok = [ pdfData writeToFile: path options: 0 error: &outError ];
// error processing omitted for brevity
}
@implementation GmdView
- (void)drawRect:(NSRect)rect
{
NSColor *back = [NSColor clearColor];
[ back set];
NSRectFill(rect);
NSString *aString = @"a";
NSRect bounds = [ self bounds ];
CGFloat fontSize = bounds.size.width;
NSFont *font = [ NSFont fontWithName: @"Times" size: fontSize ];
NSDictionary *attributes = [ [ NSDictionary alloc ]
initWithObjectsAndKeys:
[NSColor redColor],
NSForegroundColorAttributeName,
font,
NSFontAttributeName,
nil
];
NSAttributedString *as = [[ NSAttributedString alloc ] initWithString:
aString attributes: attributes ];
[ as drawAtPoint: NSMakePoint(0,0) ];
}
@end
Xcode 4.2 , OS X 10.7.2
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