uiviewcontroller

问题 I have an ImagePicker that is displayed after a ScrollViewController is presented (1). Question: Once the image is picked from the ImagePicker , how do I dismiss just the ImagePicker so that the ScrollViewController is displayed and then pass the image picked to the ScrollViewController ? (1) Presenting ScrollViewController and ImagePicker let storyboard = UIStoryboard(name: "Main", bundle: nil) let vc = storyboard.instantiateViewControllerWithIdentifier("ScrollViewControllerID") as!

问题 Ok so I have gone through almost all questions on SO and tutorials. I am now able to move my UIView up so that it is visible while typing. However the problem is, I want to move the UIView ONLY if the UITextField gets covered by the keyboard, because if it is not, then there is no point in moving the UIView . My code so far: - (void)viewDidLoad { [super viewDidLoad]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name

问题 I hope this is a simple question. I need to intercept didAddSubview , but will I need to subclass the UIView in order to override that method? The UIView that I want to override is the UIViewController 's view property, so I just want to know how to go about working with this. Thanks! 回答1: From Apple UIView documentation (see Methods to Override ): When subclassing UIView, there are only a handful of methods you should override and many methods that you might override depending on your needs.

问题 I'm trying to add UINavigationItem to my UIViewController as mentioned this answer. However the Navigation bar is not showing in my view. I tried even adding an outlet and setting the title programmatically and also adding the NavigationItem in two different places. Still it doesn't show. This view controller is embedded in a TabBarController. WHat am I missing here? Thanks is advance. 回答1: This view controller is embedded in a TabBarController But is it embedded, first and foremost, in a

问题 I'd like to replace viewcontroller (same as startactivity & finish or window.location.replace) How do I replace viewcontroller instead of push? 回答1: There's multiple ways to implement this based on your view controller containments. If you have the current view controller on top of the stack of a UINavigationController , then below is one solution: UINavigationController -- root view controller -- view controller 2 -- view controller 3 -- other view controllers in stack -- view controller n -

问题 I am concerned with my 4 view controllers. The first one is the CardWalletViewController which is a table view that is populated by Card Objects that the user has created (the card creation is OK so I won't post the code regarding that). Now, given that this table view is already populated with Card Objects, once the user clicks on a cell, another view controller, named CardDetailsViewController will show up. This will display the current points that the Card has and also the perks. Note that

问题 I am concerned with my 4 view controllers. The first one is the CardWalletViewController which is a table view that is populated by Card Objects that the user has created (the card creation is OK so I won't post the code regarding that). Now, given that this table view is already populated with Card Objects, once the user clicks on a cell, another view controller, named CardDetailsViewController will show up. This will display the current points that the Card has and also the perks. Note that

问题 Hi I have a navigationController that starts with a view controller in which in viewDidLoad has: self.navigationController.navigationBarHidden = YES; I click a button on that page and it transitions to a second view controller in which I put: self.navigationController.navigationBarHidden = NO; This works fine until I click the Back button in the navigation bar. How do I keep the navigation bar permanently off the start page but not the transitioned one? 回答1: Add self.navigationController

问题 I'm trying to figure out how to get the benefits of the PFQueryTableViewController to work inside of a a regular UIViewController that has a TableView embedded in it. Because apparently I can't load data from parse onto my TableView. It just pops up as a blank tableView with none of my information from Parse in it unless the code is ran on a UITableViewController, then it has no problems. But I'm trying to get my program to run on a Table View thats in a UIViewController. And whenever I

问题 I am pushing my UIViewController subclass onto the navigation stack; however, since it is being retained by the navigationController, I 'release' my pointer to it after pushing it onto the stack so that when it is eventually popped the viewController will be dealloc-ed. However, it's not working, the dealloc method for the viewController is never called. The code looks something like this: MyViewController *newViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"foo"];