Question

When adding an image as a SubView to another UIImageView, I am adding a marque over the new image that should follow as it is being edited (moved, zoom in/out, rotate).

I can not get the marque to stay connected to the frame of the new image though. It is initially connected when the image is added but once moved the marque goes away from the image frame.

Here is my code:

 **viewDidLoad:**
 if (!_marque)
 {
    _marque = [[CAShapeLayer layer] retain];
    _marque.fillColor = [[UIColor clearColor] CGColor];
    _marque.strokeColor = [[UIColor cyanColor] CGColor];
    _marque.lineWidth = 1.0f;
    _marque.lineJoin = kCALineJoinRound;
    _marque.lineDashPattern = [NSArray arrayWithObjects:[NSNumber numberWithInt:10],[NSNumber numberWithInt:5], nil];
    _marque.bounds = CGRectMake(_stampedImageView.frame.origin.x, _stampedImageView.frame.origin.y, 0, 0);
    _marque.position = CGPointMake(_stampedImageView.frame.origin.x + self.view.frame.origin.x, _stampedImageView.frame.origin.y + self.view.frame.origin.y);
 }
 [[_stampedImageView layer] addSublayer:_marque];

 **marque Method:**
 if (![_marque actionForKey:@"linePhase"])
 {
    CABasicAnimation *dashAnimation;
    dashAnimation = [CABasicAnimation animationWithKeyPath:@"lineDashPhase"];
    [dashAnimation setFromValue:[NSNumber numberWithFloat:0.0f]];
    [dashAnimation setToValue:[NSNumber numberWithFloat:15.0f]];
    [dashAnimation setDuration:0.5f];
    [dashAnimation setRepeatCount:HUGE_VALF];
    [_marque addAnimation:dashAnimation forKey:@"linePhase"];
 }

_marque.bounds = CGRectMake(_stampedImageView.frame.origin.x, _stampedImageView.frame.origin.y, 0, 0);
_marque.position = CGPointMake(_stampedImageView.frame.origin.x, _stampedImageView.frame.origin.y);

CGMutablePathRef path = CGPathCreateMutable();
CGPathAddRect(path, NULL, frame);
[_marque setPath:path];
CGPathRelease(path);

_marque.hidden = NO;

 **panGestureRecognizer:**
 CGPoint translatedPoint = [(UIPanGestureRecognizer*)sender translationInView:self.view];

if([(UIPanGestureRecognizer*)sender state] == UIGestureRecognizerStateBegan)
{
    _firstX = [_stampedImageView center].x;
    _firstY = [_stampedImageView center].y;
}

translatedPoint = CGPointMake(_firstX+translatedPoint.x, _firstY+translatedPoint.y);

[_stampedImageView setCenter:translatedPoint];
[self showOverlayWithFrame:_stampedImageView.frame];

Could someone help me see what I am missing please?

Thanks!

Answer 1

I think you may have an error in this line:

CGPathAddRect(path, NULL, frame);

You haven’t defined frame anywhere that I can see. Maybe _stampedImageView.frame?