According to the Pathfinder SRD site, 


  These bonuses can be added to the weapon, stacking with existing weapon bonuses to a maximum of +5


So you can take the +1 weapon after the Magic Weapon spell, and add up to +4 worth of bonus to it from the Bond.  So you won't supercede the bonus until level 17, where I imagine you'll have much better than just a level 1 Magic Weapon spell. 

EDIT: I forgot to address the DR question.  In which case I reference:


  Any weapon with at least a +1 magical enhancement bonus on attack and damage rolls overcomes the damage reduction of these monsters.


Also just to have the full ability written out:


  At 5th level, this spirit grants the weapon a +1 enhancement bonus. For every three levels beyond 5th, the weapon gains another +1 enhancement bonus, to a maximum of +6 at 20th level. These bonuses can be added to the weapon, stacking with existing weapon bonuses to a maximum of +5, or they can be used to add any of the following weapon properties: axiomatic, brilliant energy, defending, disruption, flaming, flaming burst, holy, keen, merciful, and speed. Adding these properties consumes an amount of bonus equal to the property's cost (see Table: Melee Weapon Special Abilities). These bonuses are added to any properties the weapon already has, but duplicate abilities do not stack. If the weapon is not magical, at least a +1 enhancement bonus must be added before any other properties can be added.


Therefore, whatever the final +X bonus comes out to be is the DR bypass.

Can you use Divine Bond (Weapon) with Magic Weapon Spell?
I am writing iOS application for iPad that require custom layout.

The layout from portrait and landscape are totally difference, so it can't be solve by using UIAutoResizingMask.

I try to use the layoutSubview Method, but I detected that layout subview is called a lot (from UIScrollView).
How can i reduce the layoutSubview call to optimize the code , or I should call it by my self when ever the device is rotated. 

Thank.
