Articles, podcasts and news about Swift development, by John Sundell.

Setting up tests to avoid retain cycles with weak references

Published on 22 Aug 2017
Basics article available: Memory Management

Here's an easy way to setup a test to avoid accidental retain cycles with object relationships (like weak delegates and observers) in Swift:

func testDelegateNotRetained() {
    // Assign the delegate (weak) and also retain it using a local var
    var delegate: Delegate? = DelegateMock()
    controller.delegate = delegate
    // Release the local var, which should also release the weak reference
    delegate = nil

Support Swift by Sundell by checking out this sponsor:

Essential Developer

Essential Developer: Learn the most up-to-date techniques and strategies for testing new and legacy Swift code in this free practical course for developers who want to become complete senior iOS developers. This virtual event includes lectures, mentoring sessions, and step-by-step instructions. Click to learn more.