What's the differences between IKImageBrowserView's delegate and _delegate?

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As the picture says, there are delegate, _delegate, dataSource, _dataSource, what are the differences?

Basicly, I can use the functions I want with either delegate + dataSource or _delegate + _dataSource, but I don't know what the differences are?

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Justin Levi Winter On

I believe the _delegate outlet is referencing the internal property directly whereas the delegate uses getters/setters.