Didn't work the first time I sent this, because something messed up and thought
the message was too large, when it's less than 2000 characters.
No bites on apple-dev.groups.io, so I'll try here.
I'm trying to use exclusionPaths for the first time and am not having any
success. For now, I'm just creating the stuff on the fly in my
drawLayer:inContext: method:. The string draws, but doesn't exclude any path no
matter what I set it to. I'm also not that familiar with the whole
NSTextStorage/NSLayoutManager/NSTextContainer family, other than using snippets
of code in the past, so it could be I'm doing something dumb. Any ideas?
BTW, if I instead install a UITextView and set its exclusionPaths, it works. So
does NSTextStorage not know enough to draw with the exclusionPaths, and I just
need to install text views for each one instead?
-(void)drawLayer:(CALayer*)layer inContext:(CGContextRef)ctx
{
if([layer.name isEqualToString:@"balloons"]) {
UIGraphicsPushContext(ctx);
CGRect box = CGRectMake(0, 0, 400, 400);
NSTextStorage* storage = [[NSTextStorage alloc]
initWithString:@"I like little pigs who run and scurry away from the butcher,
because the butcher is carrying a large cleaver and wants to chop them up into
delicious sandwiches!" attributes:@{NSFontAttributeName:[UIFont
systemFontOfSize:36]}];
UIBezierPath* bez = [UIBezierPath
bezierPathWithRect:CGRectMake(100, 100, 100, 100)];
NSLayoutManager* lman = [NSLayoutManager new];
[storage addLayoutManager:lman];
NSTextContainer* cont = [[NSTextContainer alloc]
initWithSize:box.size];
cont.exclusionPaths = @[bez];
[lman addTextContainer:cont];
// Trying different things to see if they make it work - nope.
[lman textContainerChangedGeometry:cont];
[lman invalidateLayoutForCharacterRange:NSMakeRange(0,
storage.length) actualCharacterRange:nil];
[storage drawInRect:box];
UIGraphicsPopContext();
}
}
--
Steve Mills
Drummer, Mac geek
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