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POAnimating an UIImageView (View) from Point A to Point B with constraints programmatically
 

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  1. POAnimating an UIImageView (View) from Point A to Point B with constraints programmatically
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    <p>I have an image view that I have lined up on the center right of my screen. All is fine when adding the image view by itself with constraints. I need to animate the image view from that original position(Point A) to the bottom portion(Point B) of the screen; the problem is when I try to animate from Point A to Point B, the image view starts off in the upper left hand corner of the screen, like it was simply added with no constraints (as opposed to where I want it starting off in the center) .</p> <p>Here is the code and some comments:</p> <pre><code>#define DEGREES_TO_RADIANS(x) (M_PI * x / 180.0) //defined above - (void)viewDidLoad { UIImage *cardFaceDownImage = [UIImage imageNamed:@"b-top@2x.png"]; UIImageView *dealCardDown = [[UIImageView alloc] initWithImage:cardFaceDownImage]; dealCardDown.translatesAutoresizingMaskIntoConstraints = NO; NSLayoutConstraint *dealCardConstraintY = [NSLayoutConstraint constraintWithItem:dealCardDown attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeCenterY multiplier:1 constant:1]; NSLayoutConstraint *dealCardConstraintX = [NSLayoutConstraint constraintWithItem:dealCardDown attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeCenterX multiplier:1 constant:130]; [self.view addConstraint:dealCardConstraintY]; [self.view addConstraint:dealCardConstraintX]; [self.view addSubview:dealCardDown]; //IF I comment out the below code the UIImageView lines up where I want it (Point A) //IF I don't coment it out, the imageview starts in the upper left hand corner of the screen //where it normally would as if just adding an image view programatically without //constraints would, but it does end up where I want it to (Point B) [self.view removeConstraint:dealCardConstraintX]; [self.view removeConstraint:dealCardConstraintY]; dealCardConstraintY = [NSLayoutConstraint constraintWithItem:dealCardDown attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeBottom multiplier:1 constant:1]; dealCardConstraintX = [NSLayoutConstraint constraintWithItem:dealCardDown attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeLeft multiplier:1 constant:130]; [self.view addConstraint:dealCardConstraintY]; [self.view addConstraint:dealCardConstraintX]; [self.view setNeedsUpdateConstraints]; [UIView animateWithDuration:2.0 delay:2.0 options:UIViewAnimationCurveEaseIn animations:^(void) { dealCardDown.transform = CGAffineTransformRotate(dealCardDown.transform, DEGREES_TO_RADIANS(90)); [self.view layoutIfNeeded]; } completion:^(BOOL finished) { } ]; } </code></pre> <p>..</p>
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