When should I use @synthesize explicitly?

Question

As far as I know, since XCode 4.4 the @synthesize will auto-generate the property accessors. But just now I have read a sample of code about NSUndoManage

Answer 1

Xcode doesn't require an explicit @synthesize declaration.

If you don't write @synthesize its the same as doing :

@synthesize manager = _manager;

The sample code might've been old. They'll update it soon.

You can access your properties like :

[self.manager function];

This is Apple's recommended convention. I follow it, and I recommend that you do too!