Is adding a subview to a view a retain cycle?

Question

I need to know if this is a retain cycle. I ran this in leaks instruments and I did not get any leaks.

class myClass: UICollectionViewCell {
   var aView = UIView()

   func test() {
       self.addSubView(aView)
   }
}

Answer 1

This code doesn't cause a retain cycle, but it doesn't work in practice either.

A view is required to be initialized with a (suitable) frame.

Answer 2

If you want to create retain cycles in Swift ( i hope just for study) you should always make present that a reference to an instance function means that you're referencing the instance as well. And when assigning to a variable, you're creating a strong reference. Make sure to wrap such references in a closure with a weak reference to the instance or make sure to manually set the variables to nil once you're done with them

Answer 3

No it will not increase retain cycle

This Example will help you to get better idea

@interface TTParent : NSObject
 @property (atomic) NSMutableArray *children;
@end

@implementation TTParent

@end

@interface TTChild : NSObject

 @property (atomic) TTParent *parent;

@end

@implementation TTChild

@end

In Some Other Class

  TTParent *parent = [[TTParent alloc] init];
  parent.children = [[NSMutableArray alloc] init];
  for (int i = 0; i < 10; i++) {
     TTChild *child = [[TTChild alloc] init];
     child.parent = parent;
     [parent.children addObject:child];

 }

It will Increase Retail Cycle because both Parent and child has strong reference of each other

to avoid this

@property (atomic,weak) TTParent *parent;