From f79cbb3b56a8612e21dd47b579a2d3f82f37d8d2 Mon Sep 17 00:00:00 2001 From: Wesley Moore Date: Sun, 11 Dec 2011 17:23:08 +1100 Subject: [PATCH] Finish off UIAlertView post --- ...c-setassociatedobject-and-uialertview.html | 21 +++++++++---------- 1 file changed, 10 insertions(+), 11 deletions(-) diff --git a/content/technical/2011/12/fun-with-objc-setassociatedobject-and-uialertview.html b/content/technical/2011/12/fun-with-objc-setassociatedobject-and-uialertview.html index 03be06f..e6dd257 100644 --- a/content/technical/2011/12/fun-with-objc-setassociatedobject-and-uialertview.html +++ b/content/technical/2011/12/fun-with-objc-setassociatedobject-and-uialertview.html @@ -1,10 +1,9 @@ -When it comes time to present errors or other messages in iOS -with [UIAlertView] it becomes immediately obvious that a more -convenient interface would involve the use of blocks. A [search on -GitHub][github-search] shows just about every iOS developer has had a -crack at it. +When it comes time to present errors or other messages in iOS with +[UIAlertView] it is immediately obvious that a more convenient interface +would involve the use of blocks. A [search on GitHub][github-search] +shows just about every iOS developer has had the same thought and had a crack at it. -[UIAlertView]: TODO +[UIAlertView]: http://developer.apple.com/library/ios/#documentation/uikit/reference/UIAlertView_Class/UIAlertView/UIAlertView.html [github-search]: https://github.com/search?type=Repositories&language=&q=uialertview&repo=&langOverride=&x=14&y=17&start_value=1 After reviewing the better options (I.e. those that actually had a @@ -25,19 +24,19 @@ blocks based wrapper with the UIAlertView. [set-object]: http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/ObjectiveC/Chapters/ocAssociativeReferences.html -In the `init` method: +In the `init` method the wrapper instance is associated with its UIAlertView: objc_setAssociatedObject(alertView, _cmd, self, OBJC_ASSOCIATION_RETAIN); Note that I'm using the implicit second argument to the method, its selector, `_cmd` as the key for the associated object. This was -suggested in a [tweet by Bill Bummager][bbum]. TODO +suggested in a [tweet by Bill Bumgarner][bbum]. [bbum]: http://twitter.com/bbum/status/3609098005 -Then in `alertView:didDismissWithButtonIndex:`, the association is -removed, `dealloc` of the wrapper called and the `UIAlertView` also -released. +Then in `alertView:didDismissWithButtonIndex:`, the association +is removed, `dealloc` of the wrapper called as a result and the +`UIAlertView` also released. SEL key = @selector(initWithTitle:message:); objc_setAssociatedObject(self.alertView, key, nil, OBJC_ASSOCIATION_RETAIN);