iOS8+ In iOS8+ you can now use the new modalPresentationStyle UIModalPresentationOverCurrentContext to present a view controller with a transparent background: MyModalViewController *modalViewController = [[MyModalViewController alloc] init]; modalViewController.modalPresentationStyle = UIModalPresentationOverCurrentContext; [self presentViewController:modalViewController animated:YES completion:nil];
EDIT: New answer that works in any orientation. The original answer only works when the interface is in portrait orientation. This is b/c view transition animations that replace a view w/ a different view must occur with views at least a level below the first view added to the window (e.g. window.rootViewController.view.anotherView). I’ve implemented a … Read more
Issue This is caused by the absence of the initializer init?(coder aDecoder: NSCoder) on the target UIViewController. That method is required because instantiating a UIViewController from a UIStoryboard calls it. To see how we initialize a UIViewController from a UIStoryboard, please take a look here Why is this not a problem with Objective-C? Because Objective-C … Read more
Swift example Updated for Xcode 10 and Swift 4 (and reportedly still works for Xcode 12.4/Swift 5) Here is a basic walk through. I originally learned a lot of this from watching this Youtube video series. Later I updated my answer based on this article. Add custom view files The following two files will form … Read more
You need to use delegate protocols… Here’s how to do it: Declare a protocol in your secondViewController’s header file. It should look like this: #import <UIKit/UIKit.h> @protocol SecondDelegate <NSObject> -(void)secondViewControllerDismissed:(NSString *)stringForFirst @end @interface SecondViewController : UIViewController { id myDelegate; } @property (nonatomic, assign) id<SecondDelegate> myDelegate; Don’t forget to synthesize the myDelegate in your implementation (SecondViewController.m) … Read more
How to without a dummy initial view controller Ensure all initial view controllers have a Storyboard ID. In the storyboard, uncheck the “Is initial View Controller” attribute from the first view controller. If you run your app at this point you’ll read: Failed to instantiate the default view controller for UIMainStoryboardFile ‘MainStoryboard’ – perhaps the … Read more
This question seems to be very popular here on Stack Overflow so I thought I would try and give a better answer to help out people starting in the world of iOS like me. Passing Data Forward Passing data forward to a view controller from another view controller. You would use this method if you wanted … Read more
You can use a delegate. So in your ViewController B you need to create a protocol that sends data back to your ViewController A. Your ViewController A would become a delegate of ViewController B. If you are new to objective C, please look at What is Delegate. Create protocol in ViewControllerB.h : #import <UIKit/UIKit.h> @protocol … Read more
The view’s window property is non-nil if a view is currently visible, so check the main view in the view controller: Invoking the view method causes the view to load (if it is not loaded) which is unnecessary and may be undesirable. It would be better to check first to see if it is already … Read more
Starting in iOS7, the view controllers use full-screen layout by default. At the same time, you have more control over how it lays out its views, and that’s done with those properties: edgesForExtendedLayout Basically, with this property you set which sides of your view can be extended to cover the whole screen. Imagine that you … Read more