How do you fix a strong reference cycle? Use a weak reference. A weak reference is a pointer that does not imply ownership. To fix our strong reference cycle, an asset should not own its holder. Edit BNRAsset.h to make holder a weak reference:

#​i​m​p​o​r​t​ ​<​F​o​u​n​d​a​t​i​o​n​/​F​o​u​n​d​a​t​i​o​n​.​h​>​
@​c​l​a​s​s​ ​B​N​R​E​m​p​l​o​y​e​e​;​

@​i​n​t​e​r​f​a​c​e​ ​B​N​R​A​s​s​e​t​ ​:​ ​N​S​O​b​j​e​c​t​

@​p​r​o​p​e​r​t​y​ ​(​n​o​n​a​t​o​m​i​c​,​ ​c​o​p​y​)​ ​N​S​S​t​r​i​n​g​ ​*​l​a​b​e​l​;​
@​p​r​o​p​e​r​t​y​ ​(​n​o​n​a​t​o​m​i​c​,​ ​w​e​a​k​)​ ​B​N​R​E​m​p​l​o​y​e​e​ ​*​h​o​l​d​e​r​;​
@​p​r​o​p​e​r​t​y​ ​(​n​o​n​a​t​o​m​i​c​)​ ​u​n​s​i​g​n​e​d​ ​i​n​t​ ​r​e​s​a​l​e​V​a​l​u​e​;​
@​e​n​d​

Build and run the program. Note that all the objects are now being deallocated correctly.

In a parent-child relationship, the general rule for preventing this type of strong reference cycle is the parent owns the child, but the child should not own the parent.