ios - Usage of CGrect for positioning button in objective c frame view bounds -

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i trying position button on uiimageview in uicollectionview .

_prevbutton.frame =  cgrectmake(self.view.bounds.origin.x, self.view.bounds.size.height, 50, 30);

how can use (self.view.bounds.origin.x, self.view.bounds.size.height) set button width , height ?i pretty new in objective c .how can comprehend use button sizing?

take @ clear understanding.

enter image description here


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