when I add a new table view to a split view by Interface Builder, I need to resize the table view by drag the table edge to fill the split view completely. I’m wondering how to do this easier than dragging?

what I want is:

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If I understand You correctly I think You want this:
Select added table view and go to Size Inspector -> Arrange -> and select:
1) Fill Container Horizontally – it will fill completely horizontally selected View.
2) Fill Container Vertically – it will fill vertically.
Note: To use this Auto Layout need to be disabled in File Inspector.
Result:
Before:
After pressed Fill Container Horizontally: