UIView addSubview auto layout not working

Question

I created a UIView programatically and add NSLayoutConstraint to it and it works and then add it as a subView of view controller\'s view. Right now I need to remove this vie

Answer 1

You need to take care of some points while adding and removing views from auto layout.

There are two methods available in UIView.h class

// Allows you to perform layout before the drawing cycle happens. 
//   -layoutIfNeeded forces layout early
- (void)setNeedsLayout;
- (void)layoutIfNeeded;

Use these methods as per your requirement. So i suggest when ever you remove subview from view, Update constraint of superior view if it is required. And then call below method to reflect layout changes.

[self.view layoutIfNeeded];

Most cases above method will solve all layout related issues. However some time if complex structure is there i mean runtime changing behaviour of views.

Then override below method in your UIViewController, Perform all frame related changes in this method.

- (void)viewDidLayoutSubviews