另一个UIView的UIView子视图，它是UIViewController的子视图，未在iOS中集中到UIViewController

Question

I have a UIView ( named fwd2) which is added as subview of a UIView (named fwd1) and this UIView is added as a subview to a UIViewController(LoginView Controller) . And on the click of of proceed button on fwd1 the fwd2 view is opened.And I'm creating Uiview programitically .UIView (fwd1) is of dynamic height and UIView (Fwd2) is of fixed height. Now I want both the UIView (fwd1 & fwd2) center to the UIViewController (LoginView Controller). My first UIView (fwd1) is getting centered to the UIViewController but second UIView (fwd2) is not getting centered. I have used

fwd1.center = self.view.center; 

and I have also tried

fwd1.center = [self.view convertPoint:self.view.center 
fromView:self.view.superview]; 

I have done same thing with second UIView ie fwd2 but my second UIView ie fwd2 is not getting centered to UIViewController . Thanks in advance.

Answer 1

Have you put the code in the right place?

These code usually should appear in the viewDidLayoutSubviews of UIViewController.

Make fwd1 centered in UIViewController:

fwd1.center = CGPointMake(CGRectGetMidX(self.view.bounds), CGRectGetMidY(self.view.bounds));

Then make fwd2 centered in fwd1 , which means fwd2 should also centered in the UIViewController (They have the same center relative to the UIWindow).

fwd2.center = CGPointMake(CGRectGetMidX(fwd1.bounds), CGRectGetMidY(fwd1.bounds));

EDIT: Thanks to the comment, I correct the code.

Answer 2

As per comment of thread creator this, solved his problem:

In which function are you writing this code? You might want to try in

- viewWillLayoutSubviews

And DO NOT forget to call super's implementation. Also first you need to center fwd1 and then fwd2.

fwd1.center = [self.view convertPoint:self.view.center fromView:self.view.superview]; 
fwd2.center = [fwd1 convertPoint:fwd1.center fromView:fwd1.superview];

Answer 3

Your fwd2 is subview of fwd1 and fwd1 is the subview of UIViewController. So you need to as below

First make centred align the fwd1 to UIViewController

[fwd1 setCenter:[[self view] center]];

Then make the fwd2 centred align to fwd1

[fwd2 setCenter:[fwd1 center]];