ios：超视图中的中心视图

Question

I'm trying to center my subview with a button in its superview . So I want the center of the subview be the center of the superview . I'm trying that with following code:

override func viewDidLoad() {
    self.view.backgroundColor = UIColor.redColor()

    var menuView = UIView()
    var newPlayButton = UIButton()
    //var newPlayImage = UIImage(named: "new_game_button_5cs")
    var newPlayImageView = UIImageView(image: UIImage(named: "new_game_button_5cs"))
    newPlayButton.frame = CGRectMake(0, 0, newPlayImageView.frame.width, newPlayImageView.frame.height)
    newPlayButton.setImage(newPlayImage, forState: .Normal)
    newPlayButton.backgroundColor = UIColor.whiteColor()
    menuView.center = self.view.center
    menuView.center = CGPointMake(self.view.bounds.size.width / 2, self.view.bounds.size.height / 2)
    menuView.backgroundColor = UIColor.whiteColor()*/
    menuView.addSubview(newPlayButton)
}

Unfortunately it doesent seem to work as this is the result:

Answer 1

    UIView *subview = your View To Be Centered In Its SuperView;

    UIView *superView = subview.superview;

    subview.center = [superView convertPoint:superView.center
                                    fromView:superView.superview];

If view is nil(on fromView:), this method instead converts from window base coordinates. Otherwise, both view and the receiver must belong to the same UIWindow object.

NOTE: If you use the auto layout stuff, then you have to change the constraints . not the frame or center.

Good Luck :)

Answer 2

Try removing your view width from your superview width, eg:

var width: CGFloat = (self.view.bounds.size.width / 2)

// (here goes your view width that you want centralize)

menuView.center = CGPointMake(width, self.view.bounds.size.height / 2)

My working code

vRate = superview
rcRating = view ( that I want to centralize in vRate )

self.rcRating = AMRatingControl(location: CGPoint(x: 0, y: 0), andMaxRating: 5)
self.vRate.addSubview(self.rcRating)

var width: CGFloat = (self.vRate.bounds.size.width / 2) - self.rcRating.bounds.size.width
self.rcRating.center = CGPointMake(width, self.vRate.bounds.size.height / 2)