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Added "Extending object's lifetime" section

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Wojciech Nagrodzki 2018-10-07 21:44:54 +02:00
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@ -195,3 +195,18 @@ struct Email: RawRepresentable {
func showUser(with: Email) { }
```
> This is to increase source code reliability by building it on data you can trust.
### Extending object's lifetime
If you are breaking reference cycle for an object bind it to a strong reference for the duration of the closure’s execution.
```swift
operation.onComplete { [weak self] result in
guard let self = self else { return }
let model = self.updateModel(result)
self.updateUI(model)
}
```
> This is to avoid deallocation of weakly referenced object during closure execution.
> Use `strongSelf` instead of `self` for local variable name until [SR-6156]( https://bugs.swift.org/browse/SR-6156) is fixed.