Using KVO for Table Updates

If you've followed the guidelines in Apple's Model Object Implementation Guide when creating your data model objects, you can handle your UITableView updates using KVO. This frees you from having to spread calls to reloadData, insertRowsAtIndexPaths:withRowAnimation:, or deleteRowsAtIndexPaths:withRowAnimation: throughout your controller class wherever the data in your table might get changed.Instead, all you have to do is observe the keypath on your data model object that holds the collection of items being displayed in the table. The easiest way to do that is in your table view controller's viewDidLoad method, like so: [self.data addObserver:self forKeyPath:@"items" options:0 context:NULL];Then, you just implement observeValueForKeyPath:ofObject:change:context...

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Posted in: KVO,Sample Code,Table Views

Private APIs

Fast with the late-breaking news, Gizmodo is reporting that Apple is now scanning submissions for illegal use of private APIs.. Really? Oh, no!Only, this, um… isn't exactly new. This was already happening, and was already pretty widely known about three weeks a...

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Posted in: App Store

Update to the MPMediaItemCollection Category

While testing and debugging, I made a few tweaks to this category. I still haven't added reordering, but I think the methods that are here are now pretty solid. If you downloaded the earlier one, you probably want to grab the updated version, as it now codes defensively so problems aren't caused when a collection becomes empty by deletion (media item collections can't be created without at least one media item).MPMediaItemCollection-Utils.h#import <Foundation/Foundation.h>#import <MediaPlayer/MediaPlayer.h>@interface MPMediaItemCollection(Utils)/** Returns the first media item in the collection */- (MPMediaItem *)firstMediaItem;/** Returns the last media item in the collection */- (MPMediaItem *)lastMediaItem;/** This method will return the item in this media collection at a specific...

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Posted in: Categories,free code