I'm trying to create a category to change the color of an existing NSAttributedString that is rendered in a CATextLayer. Here's the category implementation
@implementation NSAttributedString (_additions)
-(NSAttributedString*)attributedStringWithColor:(UIColor*)color{
NSMutableAttributedString* mutableSelf = [self mutableCopy];
[mutableSelf addAttribute:NSForegroundColorAttributeName value:color range:NSMakeRange(0, mutableSelf.length)];
return [mutableSelf attributedSubstringFromRange:NSMakeRange(0, mutableSelf.length)];
}
@end
The CATextLayer is in a subclass of CAShapeLayer. I should also mention that the CATextLayer does render with the correct attributes, EXCEPT the color.
// in .m
// class continuation:
@interface ONCShapeLayerSubclass()
{
CATextLayer* textLayer;
}
@end
@implementation
//...
-(void)update{
// method that initializes the catextlayer
//...
if(!textLayer){
textLayer = [CATextLayer layer];
textLayer.alignmentMode = kCAAlignmentCenter;
textLayer.frame = self.bounds;
textLayer.foregroundColor = [kDefaultLineColor CGColor];
[self addSublayer:textLayer];
}
textLayer.string = //// a method that returns an attributed string from a database
//...
[self updateColor];
}
-(void)updateColor{
if(textLayer)textLayer.string = [textLayer.string attributedStringWithColor:kDefaultLineColor];
}
@end
The string shows up attributed EXCEPT for the color. And then I get a whole bunch of errors:
CGContextSetFillColorWithColor: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.
Any ideas why it isn't working?
