[ios] Always pass weak reference of self into block in ARC?

Some explanation ignore a condition about the retain cycle [If a group of objects is connected by a circle of strong relationships, they keep each other alive even if there are no strong references from outside the group.] For more information, read the document

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Examples related to weak-references

Always pass weak reference of self into block in ARC? What's the difference between SoftReference and WeakReference in Java?