NSObject<-CALayer<-CATextLayer<-NDInfoLayer<-SpeedInfoLayer
NDInfoLayer contains common attributes and behavior (NSFont(s), NSMutableAttributedString(s)), and other items that are used by multiple info layers types along with common methods that operate on them. SpeedInfoLayer is a specialization of NDInfoLayer that knows how to interpret and display speed information, which is generated from the model. NDInfoLayers using a custom initializer instead of init. I had to add a line to the custom initializer in NDInfoLayer in order to initialize the underlying CATextLayer. Now, all is well.
-Michael ---------------------- The difference between genius and stupidity... ...is that genius has its limits." -- Albert Einstein On Jan 10, 2009, at 10:47 PM, Scott Anguish wrote:
On 10-Jan-09, at 7:26 PM, Michael A. Crawford wrote:I know that the documentation states the CALayer entities are to be allocated with class methods:CALayer* l = [CALayer layer]; CATextLayer* tl = [CATextLayer layer];Am I creating a problem by not allocating and initializing my layers using the class methods?No. it is perfectly valid to do that. init is the designated initializer for CALayer. +layer is simply a convenience. The header shows this, although the doc didn't (until just now -- so next push it will show the below)what you are not supposed to do is use initWithLayer:, that's a special method only used when you create custom presentation layers for a model layer (i.e. very, very rarely) (see the doc for more information).init Returns an initialized CALayer object. - (id)init Return Value An initialized CALayer object. Discussion This is the designated initializer for CALayer. See Also • + layer Declared InCALayer.h
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