using CGPointMake in relation to other objects

i have uiimageview called hitbox, , image called mainsprite. wanna when ibaction pressed, move hitbox above mainsprite. don't know if syntax know moves things on screen.

code:

hitbox.center = cgpointmake(x coordinate, y coordinate);

i want replace x coordinate , y coordinate place somewhere in relation mainsprite.

 

to move hitbox above mainsprite, have calculate height of each, , divide 2 if want hitbox sit right on top of mainsprite. use new value y coordinate after subtracting y value of mainsprite. align center of each, assign x center point new center hitbox.

if want cover mainsprite hitbox, have change place in appear in superview hierarchy. @ following methods in uiview class.

code:

 bringsubviewtofront: sendsubviewtoback: exchangesubviewatindex:withsubviewatindex: insertsubview:abovesubview: insertsubview:belowsubview: 

 

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