ios - How to accomplish a "90% slide" between two UIViews -

i have particular scenario i'm trying emulate and, being new cocoa touch, i'm not sure of best way accomplish it. pardon lacking tactical knowledge; clear exposition help.

what i'd emulate:

the app i'm looking @ (in particular) beat. below example of 1 of uiviews - in particular, notice gear icon settings @ bottom.

when gear touched or swiped up, 2 primary uiview changes occur:

1. the original uiview slid screen 90% of way (the key point being not slide all way up).
2. a new uiview slid fill newly vacated 90% space.

this basic functionality accomplish.

implementation idea #1: single uiviewcontroller w/ multiple uiviews

at first, considered having single uiviewcontroller manage both "main" , "settings" views. in case, simple thing transition these views in appropriate manner.

that said, seems bit cluttered me. depending on how robust 2 sets of functionality are, that's recipe overload single uiviewcontroller. might tell me that's okay, off bat, seems much.

implementation idea #2: multiple uiviewcontrollers within custom container viewcontroller

this route i'm going down. separates 2 discrete sets of functionality separate uiviewcontrollers (contained within container viewcontroller) , transitions between 2 via:

- (void)flipfromviewcontroller:(uiviewcontroller *)fromcontroller               toviewcontroller:(uiviewcontroller *)tocontroller {     cgfloat width = self.view.frame.size.width;     cgfloat height = self.view.frame.size.height;      fromcontroller.view.frame = cgrectmake(0.0f, 0.0f, width, height);     tocontroller.view.frame = cgrectmake(0.0f, height, width, height);      [self addchildviewcontroller:tocontroller];     [fromcontroller willmovetoparentviewcontroller:nil];      [self transitionfromviewcontroller:fromcontroller                       toviewcontroller:tocontroller                               duration:0.5f                                options:uiviewanimationoptiontransitionnone                             animations:^(void) {                                 fromcontroller.view.frame = cgrectmake(0.0f, -(height - 100.0f), width, height);                                 tocontroller.view.frame = cgrectmake(0.0f, 100.0f, width, height);                             }                             completion:^(bool finished) {                                 [fromcontroller removefromparentviewcontroller];                                 [tocontroller didmovetoparentviewcontroller:self];                             }]; } 

the problem transition: doesn't seem stop "90% of way". looks more it's intended completely transition out "old" controller , in "new" controller, though frame adjustments on 2 uiviews not supposed "complete" moves.

where i'd guidance

i'm not asking complete solution - expertise expensive. :) said, being new this, love insight on right approach be. please let me know if can provide further information.

thanks!

i think 2nd method on right track, , intuition using transitionfromviewcontroller:toviewcontroller right -- wouldn't use method if want both view controllers present , active. so, have controller gear view child view controller of custom container controller, add second child off screen bottom have. animate both views using animatewithduration:... @ end of that, animation, should have want, , container controller have 2 children.