Does an IBOutlet needs to be a property & synthesized?

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On Mac OS X, IBOutlets are connected like this:

  1. Look for a method called set<OutletName>:. If it exists call it.
  2. If no method exists, look for an instance variable named <OutletName>, set it without retaining.

On iPhone OS, IBOutlets are connected like this:

  1. call [object setValue:outletValue forKey:@”<OutletName>”]

The behavior of set value for key is to do something like this:

  1. Look for a method called set<OutletName>:. If it exists call it.
  2. If no method exists, look for an instance variable named <OutletName>, set it and retain it.

If you use a property, you’ll fall into the “Look for a method called set<OutletName>:…” case on both platforms. If you just use an instance variable, then you’ll have different retain/release behavior on Mac OS X VS iPhone OS. There’s nothing wrong with using an instance variable, you just need to deal with this difference in behavior as you switch between platforms.

Here’s a link to full documentation on just this topic.
https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/LoadingResources/CocoaNibs/CocoaNibs.html#//apple_ref/doc/uid/10000051i-CH4-SW6

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