Zombie crash because of Swift inheritance - ios

Question

I have Swift class (derived of UIView), which I call in Objective C++ code.
Initially, it worked well and looked like this:
#objc
public class HorizonView: UIView {
var dashGap: (CGFloat, CGFloat)? = nil
let titleLayer = HorizonTextLayer()
let angleLayer = HorizonTextLayer()
let dashLayer = CAShapeLayer()
override public init(frame: CGRect) {
super.init(frame: frame)
setUpLayers()
}
required public init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
setUpLayers()
}
public override var frame: CGRect {
didSet {
setUpLayers()
}
}
// other stuff here ...
}
Objective C++ calls to alloc view:
_horizonView = [[HorizonView alloc] initWithFrame:CGRectMake(10, 10, 200, 30)];
[bigView addSubview:_horizonView];
Objective C++ calls to delete view:
if ( _horizonView ) { [_horizonView removeFromSuperview]; [_horizonView release]; _horizonView = nil; }
I decided to encapsulate HorizonView by exposing only one public method. I don't know if is possible to declare a protocol, which is subclass of UIView (protocol isn't a class, is it?), so I came to class:
#objc
public class HorizonView: UIView {
static func create(p1: CGPoint, andP2 p2: CGPoint) -> HorizonView {
let implFrame = CGRect(x: p1.x, y: p1.y-10, width: p2.x-p1.x, height: 20)
let impl = HorizonViewImpl(frame: implFrame)
return impl
}
}
private class HorizonViewImpl: HorizonView {
var dashGap: (CGFloat, CGFloat)? = nil
let titleLayer = HorizonTextLayer()
let angleLayer = HorizonTextLayer()
// old class code ...
}
Now Objective C++ alloc call looks so:
if ( _horizonView ) { [_horizonView removeFromSuperview]; [_horizonView release]; _horizonView = nil; }
_horizonView = [HorizonView createWithP1:CGPointMake(10, 10)
andP2:CGPointMake(210,40)];
[EGLV addSubview:_horizonView];
And I constantly receive a crash, when profiling, seeing this:
Could you give some hints to detect the problem?
Can such inheritance approach have some flaws?