UIImageView rotation + center change cause the image to blow - ios

Question

I am trying to do a UIImageView change every second.
The change can have one of the two:
- Rotation
- Location change
I am using the following:
This is the initialization code:
+(instancetype)newWithFrame:(CGRect)frame {
MySateliteView *v = [[[NSBundle mainBundle] loadNibNamed:#"Satelite" owner:self options:nil] objectAtIndex:0];
v.frame = frame;
v.lastLocation = [SateliteCoordinate new];
return v;
}
This is the full code for the view:
-(void)createSateliteViewFromLocation:(SateliteLocation *)location {
CGPoint center = [self createPointFromLocation:location];
MySateliteView *locationView;
for (MySateliteView *v in _satelites) {
if (v.tag == location.sateliteNumber.integerValue) {
locationView = v;
break;
}
}
if (!locationView) {
locationView = [MySateliteView newWithFrame:CGRectMake(center.x - 15, center.y - 15, 30, 30)];
locationView rotate:location.coordinates.degree];
locationView.tag = location.sateliteNumber.integerValue;
[_satelites addObject:locationView];
[UIView animateWithDuration:0.7 animations:^{
[self addSubview:locationView];
}];
} else {
if ([locationView needsNewCenter:location.coordinates]) {
[UIView animateWithDuration:0.2 animations:^{
locationView.bounds = CGRectMake(0, 0, 30, 30);
locationView.center = center;
locationView.superview.clipsToBounds = YES;
}];
}
if ([locationView needsRotate:location.coordinates]) {
[locationView rotate:location.coordinates.degree];
}
}
}
For some reason, once the center is changed with a rotation already applied, the image is getting larger!
Anyone have any idea why and what I can do?
Thanx!

Answer 1

The frame is getting larger because you have constraints in a view and you're messing around with the center manually. You shouldn't mix auto layout and manual layout in this way. I'd recommend either:
Remove the constraints and do all your view layout manually by overriding layoutSubviews and drawRect: as appropriate while continuing to keep the code you already have.
Interact with the constraints instead of the frame/center/bounds. You can create an IBOutlet from the constraints in the xib so you can modify their values. You can override the system provided updateConstraints method in your view to ensure constraints are provided appropriately.
An example of updating the constraints to move your view might look like this:
[UIView animateWithDuration: .7, animations: ^{
self.constraint1.constant = 23;
[NSLayoutConstraint deactivateConstraints: #[self.constraint2]];
[self layoutIfNeeded];
}];