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Re: CATextLayer and CAConstraint
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Re: CATextLayer and CAConstraint


  • Subject: Re: CATextLayer and CAConstraint
  • From: Bill Dudney <email@hidden>
  • Date: Sun, 18 Nov 2007 06:26:13 -0700

Hi Aaron,

When trying to manipulate layers like this its best if you use a layer hosting view rather than a layer backed view. If you rely on the layer the view creates for you its often the case that you get weird behavior like this.

Instead in your awakeFromNib method you can make your view layer hosting;
myLayer = [CALayer layer];
// other myLayer initilization
[myView setLayer:myLayer];
[myView setWantsLayer:YES];


then you can add sublayers as in your addFileNameLayer: below and everything should work.

As an alternative you could simply create a text field as a label and add it as a subview of your current setup and it will become layer backed since you are adding it to a view that is layer backed.

HTH,

-bd-
http://bill.dudney.net/roller/objc

On Nov 18, 2007, at 1:00 AM, Aaron Tait wrote:

I've been pulling my hair out trying to get a CATextLayer to work with a couple of CAConstraints. The following is a method implemented in a layer backed view and the following call is made in the view's awakeFromNib:
self.layer.layoutManager = [CAConstraintLayoutManager layoutManager];


The method is as follows:

-(void)addFileNameLayer:(NSString *)fileName
{
CATextLayer * fileNameLayer = [CATextLayer layer];
fileNameLayer.string = fileName;
fileNameLayer.name = @"fileNameLayer";
fileNameLayer.fontSize = 14.0;
fileNameLayer.alignmentMode = kCAAlignmentCenter;
fileNameLayer.wrapped = YES;
fileNameLayer.anchorPoint = CGPointMake(0.5, 0.5);
fileNameLayer.bounds = CGRectMake(0, 0, 320, 50);
[fileNameLayer addConstraint:[CAConstraint constraintWithAttribute:kCAConstraintMidX relativeTo:@"superlayer" attribute:kCAConstraintMidX]];
[fileNameLayer addConstraint:[CAConstraint constraintWithAttribute:kCAConstraintMidY relativeTo:@"superlayer" attribute:kCAConstraintMidY offset:-100]];
[self.layer addSublayer:fileNameLayer];
}


When the code executes, it displays nothing. I also add another plain old CALayer before I call this method with similar constraints and it works out fine. Anyone help would be appreciated.

-Aaron
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