It's better to call layout if needed in viewWillAppear: so we can force laying out a bit later. This helps preventing some layout issues when opening the view again.

Author: Ignacio Romero Zurbuchen

Source/SLKTextViewController.m

@@ -184,9 +184,6 @@ - (void)viewDidLoad
     [self.view addSubview:self.textInputbar];
 
     [self slk_setupViewConstraints];
-    
-    // Forces laying out the recently added subviews and update their constraints
-    [self.view layoutIfNeeded];
 }
 
 - (void)viewWillAppear:(BOOL)animated
@@ -196,6 +193,9 @@ - (void)viewWillAppear:(BOOL)animated
     // Invalidates this flag when the view appears
     self.textView.didNotResignFirstResponder = NO;
 
+    // Forces laying out the recently added subviews and update their constraints
+    [self.view layoutIfNeeded];
+    
     [UIView performWithoutAnimation:^{
         // Reloads any cached text
         [self slk_reloadTextView];