The `weakSelf` dance requires the use of a `strongSelf` in non-trivial blocks. In these cases, `weakSelf` could disappear right out from under the block. A crash could potentially occur due to setting a `nil` value in an `NSMutableDictionary`.
The `weakSelf` dance requires the use of a `strongSelf` in non-trivial blocks. In these cases, `weakSelf` could disappear right out from under the block. A crash could potentially occur due to setting a `nil` value in an `NSMutableDictionary`.