Combination of CoreAnimation CALayer and CATextLayer

Question

I just play with CA lately. Now i'm stuck. This is what I want to revive:

At the moment, I have already received the animation of the circle. I have subclassed CALayer to do the animation. I really don't know where to go from here. Where should I add a CATextLayer sublayer? How can I animate at the same time, so that the text with its line is glued to the end of the circle?

If you need some code or something else, let me know.

I would be very happy to receive help here :-)

Thank you so much!

Answer 1

, . , , , . UILabel CATextLayer ( UILabel).

    CAShapeLayer* circle = [[CAShapeLayer alloc] init];
    CGMutablePathRef path = CGPathCreateMutable();
    CGRect textRect = CGRectMake(self.bounds.size.width/4, (self.bounds.size.height-self.bounds.size.width/2)/2, self.bounds.size.width/2, self.bounds.size.width/2);
    float midX = CGRectGetMidX(textRect);
    float midY = CGRectGetMidY(textRect);
    CGAffineTransform t = CGAffineTransformConcat(
                            CGAffineTransformConcat(
                                CGAffineTransformMakeTranslation(-midX, -midY), 
                                CGAffineTransformMakeRotation(-1.57079633/0.99)), 
                            CGAffineTransformMakeTranslation(midX, midY));
    CGPathAddEllipseInRect(path, &t, textRect);
    circle.path = path;
    circle.frame = self.bounds;
    circle.fillColor = [UIColor clearColor].CGColor;
    circle.strokeColor = [UIColor blackColor].CGColor;
    circle.lineWidth = 60.0f;
    [self.layer addSublayer:circle];

    CABasicAnimation* animation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
    animation.duration = 15.0f;
    animation.fromValue = [NSNumber numberWithFloat:0.0f];
    animation.toValue = [NSNumber numberWithFloat:1.0f];
    animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
    [circle addAnimation:animation forKey:@"strokeEnd"];

    [circle release];

    UILabel* label = [[UILabel alloc] init];
    label.text = @"Test Text";
    label.font = [UIFont systemFontOfSize:20.0f];
    label.center = CGPathGetCurrentPoint(path);
    label.transform = CGAffineTransformMakeRotation(1.57079633);
    [label sizeToFit];
    [self.layer addSublayer:label.layer];

    CAKeyframeAnimation* textAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
    textAnimation.duration = 15.0f;
    textAnimation.path = path;
    textAnimation.rotationMode = kCAAnimationRotateAuto;
    textAnimation.calculationMode = kCAAnimationCubicPaced;
    textAnimation.removedOnCompletion = NO;
    [label.layer addAnimation:textAnimation forKey:@"position"];

Answer 2

UIView, layoutSubviews.
UIView . - :

myView = [[myView alloc] initWithFrame:CGRectMake(100,100,100,100)];
[self.view addSubview:myView];

- layoutSubviews:

- (void) layoutSubviews{
     [super layoutSubviews];

      mainLayer.frame = CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);

      CALayer *circle = [[[CALayer alloc] init] autorelease];
      //You have to set up the circle image and everything
      circle.position = mainLayer.position;
}

, myView .h, .

EDIT: , layoutSubview, , , mainLayer.position;