如何在中心设置多个UIView

Question

I have tried these solutions:
First solution

ansview.center = CGPointMake(viewAnswer.frame.size.width  / 2,
                viewAnswer.frame.size.height / 2);
    ansview.center = CGPointMake(viewAnswer., viewAnswer.height/2)

Second solution

self.ansview.center = CGPointMake(CGRectGetMidX(self.viewAnswer.bounds),
                CGRectGetMidY(self.viewAnswer.bounds));

I have already tried this code. But only one view is set to center. How to set multiple views in center?

Answer 1

viewDidLayoutSubviews is called to notify the view controller that its view has just laid out its subviews.

override func viewDidLayoutSubviews() {
        self.ansview.center = CGPointMake(self.viewAnswer.bounds.size.width / 2, self.viewAnswer.bounds.size.height / 2)
    }

You should use the bounds and not the frame , as the frame is undefined if the view has a transform.

Answer 2

You can also try this

[ansview setCenterX:self.view.centerX];
[ansview setCenterY:self.view.centerY];