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

Overriding self with a weak reference

Published on 12 Jun 2017

Avoid memory leaks when accidentially refering to self in closures by overriding it locally with a weak reference:

dataLoader.loadData(from: url) { [weak self] result in
    guard let self = self else { 
        return 
    }

    self.cache(result)
    
    ...

Support Swift by Sundell by checking out this sponsor:

Genius Scan SDK

Genius Scan SDK: Add a powerful document scanner to any iOS app. Genius Scan’s SDK features advanced image processing that’s the result of over 10 years of research and development and can be fully customized and integrated into your app with just one line of code. Mention Swift by Sundell when requesting a free demo to get a 20% discount on your license for a whole year.