On Feb 4, 2016, at 2:59 PM, Quincey Morris
<quinceymor...@rivergatesoftware.com> wrote:
>
> On Feb 4, 2016, at 13:01 , Steve Christensen <puns...@mac.com
> <mailto:puns...@mac.com>> wrote:
>>
>> it looks like the width of the embedding view is set to the text width of
>> the UILabel instead of the text height, which is borne out by the view
>> geometry
>
> Can you use a custom class for the embedding view and override its
> ‘intrinsicContentSize’ property to return the inner view’s height and width
> reversed?
Quincey: Thanks for a starting point.
I spent this afternoon playing around with it some more. Overriding
-intrinsicContentSize does result in a correctly sized bounds, but the frame is
still invalid and the view contents are still drawn incorrectly.
I finally found a simple solution that avoids all the headache of trying to get
auto layout to play nicely with a transformed UILabel: I don't apply a
transform to the UILabel. Instead I subclass UILabel and override two of its
methods: -textRectForBounds:limitedToNumberOfLines: (which
-intrinsicContentSize calls) and -drawTextInRect:.
- (CGRect) textRectForBounds:(CGRect)bounds
limitedToNumberOfLines:(NSInteger)numberOfLines
{
CGRect textRect = [super textRectForBounds:bounds
limitedToNumberOfLines:numberOfLines];
return CGRectMake(textRect.origin.y, textRect.origin.x,
textRect.size.height, textRect.size.width);
}
- (void) drawTextInRect:(CGRect)rect
{
CGContextRef context = UIGraphicsGetCurrentContext();
CGRect bounds = self.bounds;
CGFloat translateX = bounds.size.width / 2;
CGFloat translateY = bounds.size.height / 2;
CGAffineTransform transform = CGAffineTransformIdentity;
transform = CGAffineTransformTranslate(transform, translateX,
translateY);
transform = CGAffineTransformRotate(transform, (CGFloat)-M_PI_2);
transform = CGAffineTransformTranslate(transform, -translateX,
-translateY);
CGContextSaveGState(context);
CGContextConcatCTM(context, transform);
rect = CGRectApplyAffineTransform(rect, transform);
[super drawTextInRect:rect];
CGContextRestoreGState(context);
}
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