viewwillappear | 易学教程

- (void)viewWillAppear:(BOOL)animated detect custom animation

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问题 I have a button which when pressed pushes a view controller however i'm using a custom animation so pushViewController: childController animated: is set to NO. What i want to do though is detect this custom animation in my - (void)viewWillAppear:(BOOL)animated method and write an if statement like this; - (void)viewWillAppear:(BOOL)animated { if (customAnimation occured) {//Do this} else {//Do this} } This is the method for my button which pushes the view controller. - (void)nextPressed:(id

Android SDK equivlent for viewWillAppear (iOS)?

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问题 Situation I have a fairly simple app with 2 "layouts" using SharedPreferences. Main.xml Settings.xml Main has a textView that uses getString from SharedPreferences. Also a button to open Settings. Settings has a spinner and a button to save to SharedPreferences. The textView gets updated when the App loads as I am calling setText() inside onCreate(Bundle savedInstanceState) Problem When I open Settings and update the SharedPreferences, I use the Back button to get back to Main. Since I am

Delete Rows from UITableView

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问题 Here is the code for my delete, it works fine but you have to open another tab and then click this tab again for the item to be removed. As this is not the normal UITableView you cannot just remove from array and then update table. so could someone please help me refresh the view. Also the snippet below does not work: // Reload the view completely if ([self isViewLoaded]) { self.view=nil; [self viewDidLoad]; } Here is my delete code: - (void)tableView:(UITableView *)tableView

Toolbar items dissapear when view changed with UIActionSheet

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问题 When initiating a view from a UIActionSheet button, upon returning to the view via the navigationBar back button, the toolbar while still visible does not have any of the buttons that were previously on it. This error has arisen since updating to iOS 6 and occurs while testing it on the simulator and a device running iOS 6 only. If I comment out the code that hides the toolbar on the view pushed by the UIActionSheet the buttons are added when going back. I'm making my toolbar items

Delete Rows from UITableView

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Here is the code for my delete, it works fine but you have to open another tab and then click this tab again for the item to be removed. As this is not the normal UITableView you cannot just remove from array and then update table. so could someone please help me refresh the view. Also the snippet below does not work: // Reload the view completely if ([self isViewLoaded]) { self.view=nil; [self viewDidLoad]; } Here is my delete code: - (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath { // If row is

Determine viewWillAppear from Popped UINavigationController or UITabBarController

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I am unable to find a way to distinguish between popping from the Nav controller stack and entering the view controller from the UITabBarController. I want to call a method in ViewWillAppear only when the view is presented from the TabBar, not when someone presses back in the navigation controller. If I wasn't using a TabBarController, I could easily get this functionally using viewDidLoad. I've tried, override func viewWillAppear(animated: Bool) { super.viewWillAppear(animated) println("View Will Appear") if isBeingPresented() { println("BP") } if isMovingFromParentViewController() { println(

iOS - Loop through Cells and retrieve data

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问题 Sorry I'm pretty new to iOS dev. I have a UITableView setup from cells being pulled from a single XiB nib. I've created a on/off switch in the nib, and I am trying to save the state of the switch upon viewWillDisappear for the number of cells that I have. (6 cells to be exact). How can I loop through all the cells and save this information? I tried this in my UIViewController to get the info for one cell: - (void)viewDidDisappear:(BOOL)animated { [super viewDidDisappear:animated]; UITableView

View Controller loads before data is pulled from firebase login - Swift

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I am having trouble getting data to load correctly in my ViewDidAppear method when using a Firebase login. I want the user to press the login button, the app to retrieve the user's information from Firebase, and then display it in the next view controller (which is part of a new tab bar controller). When I use breakpoints, I can see that the new view appears and THEN the data is pulled from Firebase. I need the data to be loaded from Firebase before the view appears. Here is my code for the login button: let userSettings = NSUserDefaults.standardUserDefaults() @IBAction func signInButton

iOS routing viewDidAppear to child view controllers?

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问题 I'm adding a child view controller to a parent view controller, and everything works as expected, except that child view controller isn't having its usual callbacks triggered. eg, things like viewWillAppear(animated) is never called. I looked into it and thought it may be because I wasn't calling willMoveToParentViewController and didMoveToParentViewController on the child view controller before and after adding it to the parent, respectively. Unfortunately, fixing that has made no difference

Taking a picture from the camera and show it in a UIImageView

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问题 I have a view with some fields (name, price, category) and a segmented control, plus this button to take picture. If I try this on the simulator (no camera) it works properly: I can select the image from the camera roll, edit it and go back to the view, which will show all the fields with their contents . But on my iphone, when I select the image after the editing and go back to the view, all the fields are empty exept for the UIImageView. I also tried to save the content of the fields in