viewcontroller

问题 This question already has answers here : How can I convert my device token (NSData) into an NSString? (28 answers) Closed 2 years ago . I don't understand how to present the apns token as a string in view-controller. tried a lot of things and nothings worked out. in swift 4. 回答1: 1. You can save it to UserDefaults as Halil suggested like so: UserDefaults.standard.set(yourAPNSToken, forKey: "APNSToken") And retrieve it inside your ViewController: let token = UserDefaults.standard.string(forKey

问题 I need to turn off the automatic gesture swiping to go back in navigation controller. I using Swift. I have already searched but didn't found a solution for me. 回答1: You can disable the interactivePopGestureRecognizer of your navigationController: self.navigationController?.interactivePopGestureRecognizer.enabled = false 回答2: self.navigationController.interactivePopGestureRecognizer.delegate = self func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer!) -> Bool { return

问题 I'd like to get access to a ViewController from an extension and then override a function from a library which should change variables or invoke methods from a specific ViewController (in this case "ViewController"). How can I do that? Or is there a more recommended option? (Hint: I don't want to instantiate a new VC) import PopupDialog class ViewController: UIViewController { //e.g. variable and method to access from extension var score: Int = 0; func startGame(){ ... } } extension

问题 Im trying to append to my array var feedArray: [AnyObject] = [] from another class. I have 2 classes: class FeedViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate { var feedArray: [AnyObject] = [] and class AddEditViewController: UIViewController, NSFetchedResultsControllerDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate { I want to in my "AddEditViewController" append

问题 I have tow views in my app. A main view(ViewController.swift) and a sidebar(SideBar.swift). If I tapp a button in the sidebar an UIAlertView should be displayed (I call a function in ViewController.swift). But the app crashes because the main view is nil. Do you know how I can fix this? My code in the function (display alert): let alertView = UIAlertController(title: "You need to log in first", message: "To access the special features of the app you need to log in first.", preferredStyle:

问题 I´m trying to implement a Popover for iPad and iPhone. Before iOS 9, there were different ViewController for iPad and iPhone. With iOS9 there should be a possibility to do this with a normal ViewController and different PresentationStyles? (Deployment Target is iOS 9.0) Am i right? according to this post: Stackoverflow answer from Daniel Galasko I tried to implement this answer in objective c. _mediaTypePopoverVC = [[MediaTypePopoverVC alloc] initWithProductId:PRODUCT_ID_NONE_PARENT];

问题 I don't know if it is possible, but I would like to call a view controller's method in a class object. I have method like this in my view controller's .m file: -(void)showLeaderBoard { GKLeaderboardViewController *leaderboardController = [[GKLeaderboardViewController alloc] init]; if (leaderboardController != nil){ leaderboardController.leaderboardDelegate = self; [self presentModalViewController: leaderboardController animated: YES]; } } I would like to call that method in a SKScene file.

问题 i want to change a label in my view controller when the app enters the foreground....: SalaryAppV4AppDelegate.h @interface SalaryAppV4AppDelegate : NSObject <UIApplicationDelegate, UITabBarControllerDelegate> { //---------------------------------------------- NSTimeInterval appEnteredBackground; NSTimeInterval appEnteredForeground; NSTimeInterval difference; NSString *times; //----------------------------------------------- SalaryAppV4AppDelegate.m - (void)applicationWillEnterForeground:

问题 I have some doubts with the ARC. In ARC: When a viewcontroller is dismissed by using the dismissViewController/popViewController, Will it's allocated memory automatically get released? What will happen when there is an asynchronous NSURLConnection is running and before that operation completed, viewcontroller got dismissed? Thank you 回答1: When you dismiss a view controller (or pop it), it will be deallocated if you didn't make any strong pointers to it (that controller is retained by the

问题 I created a class newView from UIView and aim to draw a quadrangle. the 4 coners (ClipPointA, ClipPointB, ClipPointC, ClipPointD) of the quadrangle are supposed to read value from ViewController. newView.h: @interface newView : UIView { CGPoint ClipPointA, ClipPointB, ClipPointC, ClipPointD; } @end newView.m: @implementation newView - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { // Initialization code. } return self; } - (void)drawRect:(CGRect)rect { //