Had a similar problem today. I solved it by first calling -setNeedsLayout: Set the flag that the view needs layout, and afterwards calling -layoutIfNeeded: Check the flag immediately and – as it was set manually before – as result layoutSubviews is called. Don’t know if this is the best way, but it works 😉
Objective-C: UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@”MainStoryboard” bundle:nil]; UITabBarController *rootViewController = [storyboard instantiateViewControllerWithIdentifier:@”tabBarcontroller”]; [[UIApplication sharedApplication].keyWindow setRootViewController:rootViewController]; Swift : let mainStoryboard: UIStoryboard = UIStoryboard(name: “Main”, bundle: nil) let viewController = mainStoryboard.instantiateViewControllerWithIdentifier(“tabBarcontroller”) as UITabBarController UIApplication.sharedApplication().keyWindow?.rootViewController = viewController; Swift 3: let mainStoryboard: UIStoryboard = UIStoryboard(name: “Main”, bundle: nil) let viewController = mainStoryboard.instantiateViewController(withIdentifier: “tabBarcontroller”) as! UITabBarController UIApplication.shared.keyWindow?.rootViewController = viewController Swift … Read more
if([some_object isKindOfClass:[A_Class_Name class]]) { // do somthing }
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
Try following code: for controller in self.navigationController!.viewControllers as Array { if controller.isKind(of: ViewController.self) { self.navigationController!.popToViewController(controller, animated: true) break } }
Override the viewWillDisappear method in the presented VC, then check the isMovingFromParentViewController flag within the override and do specific logic. In my case I’m hiding the navigation controllers toolbar. Still requires that your presented VC understand that it was pushed though so not perfect.
You can access it with: MyViewController* mainController = (MyViewController*) self.window.rootViewController; If you are nesting your view behind a tabviewcontroller or navigation controller it will return that to you and you will need to access your view controller inside of it
I used: convenience init() { self.init(nibName:nil, bundle:nil) } Some people suggested: convenience init(){ self.init() } But this gives you an infinite loop.
Simple but it work very fine. IOS 7.1 and 8 AppDelegate.h @property () BOOL restrictRotation; AppDelegate.m -(NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window { if(self.restrictRotation) return UIInterfaceOrientationMaskPortrait; else return UIInterfaceOrientationMaskAll; } ViewController -(void) restrictRotation:(BOOL) restriction { AppDelegate* appDelegate = (AppDelegate*)[UIApplication sharedApplication].delegate; appDelegate.restrictRotation = restriction; } viewDidLoad [self restrictRotation:YES]; or NO
When you create a layer (like your gradient layer), there’s no view managing the layer (even when you add it as a sublayer of some view’s layer). A standalone layer like this doesn’t participate in the UIView animation system. So when you update the frame of the gradient layer, the layer animates the change with … Read more