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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (CB-8863) Fix potential problems with blocks usage in core plugins
Date Wed, 18 Nov 2015 00:44:11 GMT


ASF GitHub Bot commented on CB-8863:

GitHub user purplecabbage opened a pull request:

    CB-8863 correct block usage for async calls


You can merge this pull request into a Git repository by running:

    $ git pull CB-8863

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #139
commit 7f3a0a5483322a76e9121bda18f36ec84566aeab
Author: Jesse MacFadyen <>
Date:   2015-11-18T00:37:45Z

    CB-8863 correct block usage for async calls


> Fix potential problems with blocks usage in core plugins
> --------------------------------------------------------
>                 Key: CB-8863
>                 URL:
>             Project: Apache Cordova
>          Issue Type: Bug
>          Components: iOS
>            Reporter: Shazron Abdullah
>            Assignee: Jesse MacFadyen
>              Labels: cordova-ios-5.0.x
> Audit the core plugins to check for proper blocks usage.
> Problems that I see can be summed up in this (fixed) code:
> 1. You need a weak reference to "self" in blocks to prevent retain cycle problems.
> Fix:
> 2. Anything that calls UIKit methods, which includes plugins that write JavaScript back
to the UIWebView (commandDelegate functions), must be called in the main thread.
> Fix:
(UPDATE: we actually already handle this in evalJS)
> 3. Avoid creating private variables like this in the first place -- I would create a
class extension which will effectively have "private" properties (nothing is truly private
in objc). This is to avoid this situation in the block where you have to cast the weak self
into a strong self (and check it's still around), just to access a private variable:
> Of course since we are modifying UIKit items here, rule 2 above also applies.

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