How can I set align a uibutton to the right programmatically?

Just like the image shown. How can I align a button to the right? CGRectMake seems only create frame based on the float x, y which origin from the left top corner. Thanks for any help.

enter image description here

Solution

The x origin depend of the width of the superview (in my example self.view)

#define RIGHT_MARGIN 20

myButton.frame = CGRectMake(self.view.frame.size.width - myButton.frame.size.width - RIGHT_MARGIN, yValue, myButton.frame.size.width, myButton.frame.size.height)