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Ping @jpsim : I was wondering about the multipeer servicetype, is it really true that it is reverse dns notation? I thought it was like Bonjour, as they say here. Do you have any source for this? I remember that a while ago I tried using dots in my service type and stuff crashed, but maybe this changed?

in the paragraph "Download requests take a request as well...." of section Constructors in article issue-5-4 I found something hard to be understood.

1. it says in the last: "...the completion handler to move the file from its temporary location to a permanent location, which is then the return value of the block: ". But the block here actually has no return value. so the code below will not be compilable.
2. I also don't get the idea of the code of the block below that is using the [response URL] instead of the return value NSURL * location. isn't the latter to be the actual temp file's URL?

I think it will be good idea if you can turn all the articles into ebook (should be free ^^ ) so that we can easily read

The Apple Core Data Concurrency Guide (https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/CoreData/Articles/cdConcurrency.html) linked to in issue 2 under common background practices (http://www.objc.io/issue-2/common-background-practices.html) is considered out of date by Apple with the following notice at the top of the page:

"Important: Best practices for concurrency with Core Data have changed dramatically since this document was written; please note that this chapter does not represent current recommendations."

It seems like your engine replaces all http links to https. It breaks some links, e.g. http://www.unicode.org/cldr/charts/latest/supplemental/language_plural_rules.html in 2014-02-10-string-localization.md article is ok, but being changed to https://www.unicode.org/cldr/charts/latest/supplemental/language_plural_rules.html isn't.

Unfortunately I don't have the in-depth knowledge for a pull request but HN thinks there are some corrections to be made - https://news.ycombinator.com/item?id=7363083

in Article
https://github.com/objcio/articles/blob/master/2014-03-07-data-synchronization.md

https://www.wasabisync.com/ ---> http://www.wasabisync.com/
and it show
We're sorry, but Wasabi Sync is no longer accepting new development accounts at this time.

Dropbox DataStore API
https://www.dropbox.com/developers-v1/datastore -> Warning: The Datastore API has been deprecated.

In the first section about Importing into CoreData in the background, you say
"Note that by passing in the main queue as a parameter, the block will be called on the main thread"

Why in the code, you still pass "nil" ?

Please fix the article about multitasking following this conversation: nomad-cli/houston#86 (comment).

Image links are broken, could you please fix that?

The iCloud and CoreData Article is in fact pretty good but for me there was one thing missing.

I wondered how to figure out when to update the UI when an App is first launched and the iCloud Store is filled with data.
I tought listening for the Notification in storesWillChange: would be enough.
In fact you need to update when the storeDidChange: like this (otherwise the managedObjectContext would still be different to the iCloud content):

- (void)storesDidChange:(NSNotification *)note {
    //check if iCloud is imported
    NSNumber *storeVal = [note.userInfo objectForKey:NSPersistentStoreUbiquitousTransitionTypeKey];
    if (storeVal.integerValue == NSPersistentStoreUbiquitousTransitionTypeInitialImportCompleted) {
        NSLog(@"On iCloud Store now");
        //ensure that the UI will be updated d on the mainthread for UI threadsafety otherwise
        //this will cause a lot of trouble...
        dispatch_async(dispatch_get_main_queue(), ^{
           //update UI });
    }
}

I'm not sure if this was the focus of the article or I didn't read it carefully enough but maybe it's worth a consideration.

How to fix typos/errors in blog posts?

From @orta : I suspect you're using a float here, you probably want to make it columns, as that pete dude just keeps on contributing

I'm reading http://www.objc.io/issue-3/scroll-view.html
In section A Windows into the world : content size, the image is not quite right.
It should be contentOffset {x: 80, y: 40 } instead of contentOffset {x:-80, y:-40}

Somebody sent this in over email:

Hi,
i want just report that in this article: http://www.objc.io/issue-12/animations-explained.html
when you show the animation:

RBBTweenAnimation

the keyPath is not position.x but position.y in 2 snippet of code.