IBOutletCollection

So, I’ve been watching the new Standford Coding Together series by Paul Hegarty and apparently I’ve been living under a rock because I completely missed the introduction of IBOutletCollections in iOS 4 (mentioned in Lesson 3). These collections allow you to assign multiple objects to a single outlet, giving you an array of the objects in the storyboard.

For example,

@property (nonatomic, retain) IBOutletCollection(UISwitch) NSArray *switchCollection;

would allow you to connect multiple switches to the single switchCollection outlet. Then you could use simple key/value coding to quickly toggle all the values:

[switchCollection setValue:@(NO) forKey:@"on"];

I’ve had a few projects where this would have come in handy and saved creating multiple outlets.

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