CAConstraintLayoutManager problem

Subject: CAConstraintLayoutManager problem
From: Stig Brautaset <email@hidden>
Date: Tue, 30 Sep 2008 20:50:08 +0100
Delivered-to: email@hidden
Delivered-to: email@hidden

Hi,

I'm having trouble laying out sub-layers with CAConstraintLayoutManager. I expect to get 5 boxes horizontally packed into the super layer, which in IB is set to fill the entire view. I expect the boxes to be equally sized, because I constrain the leftmost and the rightmost to the leftmost and rightmost edges of the superview, and the leftmost edge of the inner boxes to the rightmost edge of the previous. Instead what I get is just a pretty blue background with a single square on it. The only good thing to be said for it is that it is scaled, and positioned, correctly in the vertical dimension.

What am I doing wrong in the below code?


@implementation MyView

- (void)awakeFromNib {
   CALayer *layer = [CALayer layer];
   self.layer = layer;
   self.wantsLayer = YES;

   layer.backgroundColor = CGColorCreateGenericRGB(0, 0, 0.4, 1);
   layer.layoutManager = [CAConstraintLayoutManager layoutManager];

   CALayer *bar;
   NSString *previous = nil;
   NSUInteger count = 5;
   for (int i = 0; i < count; i++) {
       bar = [CALayer layer];
       bar.name = [NSString stringWithFormat:@"bar%d", i];
       bar.borderColor = CGColorCreateGenericGray(1, 0.5);
       bar.borderWidth = 8;
       bar.cornerRadius = 16;

[bar addConstraint:[CAConstraint constraintWithAttribute:kCAConstraintHeight relativeTo:@"superlayer" attribute:kCAConstraintHeight scale:i / (float)count offset:0]];

[bar addConstraint:[CAConstraint constraintWithAttribute:kCAConstraintMidY relativeTo:@"superlayer" attribute:kCAConstraintMidY]];

if (!previous) [bar addConstraint:[CAConstraint constraintWithAttribute:kCAConstraintMinX relativeTo:@"superlayer" attribute:kCAConstraintMinX]]; else [bar addConstraint:[CAConstraint constraintWithAttribute:kCAConstraintMinX relativeTo:previous attribute:kCAConstraintMaxX]];

NSLog(@"%@ => %@", previous, bar.name); previous = bar.name; [layer addSublayer:bar]; } [bar addConstraint:[CAConstraint constraintWithAttribute:kCAConstraintMaxX relativeTo:@"superlayer" attribute:kCAConstraintMaxX]]; }

@end


Stig
--
http://code.brautaset.org
http://devblog.brautaset.org


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