Im my application, I display a NSView when a user click on an icon in the systemstatusbar.
This NSView is displayed with MAAttachedWindow.
My question is : how to refresh the NSView content when the attachedWindow is displayed (makeKeyandorderFront)
I've tried to refresh the content in the awakeFromNib method,but it works only once.
Could anyone help me?
thanks
The solution I've found:
I've added a observer in my view:
I've set the object to [selft window] to listen the NSWindowDidBecomeKeyNotification notification of the MAAttachedwindow.
-(void)awakeFromNib
{
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(windowDidBecomeKey:) name:NSWindowDidBecomeKeyNotification object:[self window]];
}
-(void) windowDidBecomeKey:(NSNotification *)note
{
// Do refresh here
}
The reason -awakeFromNib only works once is presumably because you're only loading the assembly from the xib once and keeping it around.
Presumably whatever action actually shows your view in the MAAttachedWindow instance is the ideal place to "refresh" it before display, ie your own call to -makeKeyAndOrderFront:.
So: What have you tried?
Related
I need to find the way to respond to notification centre being closed/hidden. The reason is that I have a pop up NSMenu in that widget, and if you open it and then close entire notification centre, pop up menu remains on the screen.
I have already tried to implement NSWindowDelegate but there is no such event that defines closing of today widget centre. The closest things I found are -windowDidMiniaturize: and
-windowWillClose:. But when side bar closes they are not invoked.
Finally I have found needed method in NSWindowDelegate protocol.
First step is to add self (in that case it is viewController) as an observer for desired method: windowDidResignKey:
-(void)viewWillAppear {
//set this view controller delegate for selector windowDidResignKey
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(windowDidResignKey:) name:NSWindowDidResignKeyNotification object:self.view.window];
}
And second is to implement this method:
- (void)windowDidResignKey:(NSNotification *)notification {
//If window did resign key (close today center) - close menus
if(_sourceLanguageMenu)
[ _sourceLanguageMenu cancelTracking];
if(_targetLanguageMenu)
[ _targetLanguageMenu cancelTracking];
}
I'm using storyboard.
As I remeber (I worked with ios 4, long time ago=)) everytime, when View appears, calls
-(void)viewWillAppear:(BOOL)Animated {}
method.
Now this method doesn't call, if I press Home button and run app again.
How to fix it?
I need to update one UIView if it appears after home pressing.
The function viewWillAppear is not part of UIView. It is part of UIViewController.
It is called after the view controller's view has been loaded and just before it starts to transition onto screen.
If you create a subclass of UIView and put this function in it then it will never be called because it isn't supposed to be.
Edit
You are correct that viewWillAppear does not get called when the app is coming back from the background.
If you want to update a part of your app when this happens then you can do something in the AppDelegate.
I'd recommend not trying to store properties etc... in the AppDelegate though. You should do something like this...
- (void)applicationWillEnterForeground:(UIApplication *)application
{
// Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
// just pass the message on. In your view you will need to add an observer for this notification
[[NSNotificationCenter defaultCenter] postNotificationName:#"UpdateViewNotification" object:nil];
}
try this, call the super,
-(void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
}
I have an application with Textfields in my MainViewController.m file. There is also a scrollview in that file, so when the keyboard comes up, the view scrolls so the user can see the textfield. The keyboard is dismissed when the user taps on the screen. Everything is working well EXCEPT in the case that the user hits the home button to put the app in the background and then comes back to it. In this case, the keyboard is still up, but my scrollview is down with textfields hidden. Ideally I would like to have the keyboard be dismissed as well.
Having looked into it, the methods that are called are all in the AppDelegate.m file (unfortunately it does not go into ViewDidLoad or any of the View lifecycle methods). How do I dismiss the keyboard from applicationDidEnterBackground in the AppDelegate.m file?
I am kind of a newbie - I have tried making a +dismisskeyboard function in my MainViewController file and calling it from the Appdelegate, but my Textfields are all instance variables and that does not work. I have also tried to create a textfield in my AppDelegate file and then do this -
[_someField becomeFirstResponder];
[_someField resignFirstResponder];
but this also does not work... I can't figure out how to link anything on my storyboard to the AppDelegate property of someField.
Can anyone suggest the correct approach to tackle this problem?
Just register a method for UIApplicationDidEnterBackgroundNotification in your MainViewController class and dismiss your keyboard there. e.g.
Register for the notification
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(receivedNotification:) name:UIApplicationDidEnterBackgroundNotification object:nil];
then add this method
- (void) receivedNotification:(NSNotification *) notification
{
[txtFld resignFirstResponder];
}
I'm wondering if there is any way to return from UIViewController like 3-4 step backward, I've a main screen which will navigate to other UIViewController via presentModalViewController, on the next view, it will have a UINavigationBar which will navigate to a 4-5 level deeps. i wanna to put a button that let the user go back to the home directly without returning for all the view he enter.
thx in advance.
Have your root level view controller register as an observer of a notification, such as "POP_TO_ROOT". When it receives this notification, call a method to dismiss your modal view controller (or whatever is first on the stack).
In your viewcontroller stack, any of the views 4 or 5 levels in can just post a notification "POP_TO_ROOT".
EDIT: add code
In your main "screen" before you call presentModalViewController, do this:
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(handlePopToRoot)
name:#"POP_TO_ROOT"
object:nil];
and add this method:
- (void) handlePopToRoot {
[[NotificationCenter defaultCenter] removeObserver:self
name:#"POP_TO_ROOT"
object:nil];
[self.navigationController dismissModalViewControllerAnimated: YES];
}
Then, down deep in your viewcontroller hierarchy, when you want to pop all the way out,
you just need to post a notification:
[[NSNotificationCenter defaultCenter] postNotification:#"POP_TO_ROOT" object:nil];
If I understand your question correctly, you are presenting a navigation controller (with a root view controller attached to it) from your "main view controller" modally, and you want to be able to get back to your "main view controller".
Because you will always have pointer to your navigation controller, you should be able to call
dismissModalViewControllerAnimated: from any of your view controllers and it will take you right back to the main view controller.
[[self.navigationController parentViewController] dismissModalViewControllerAnimated:YES]
Save your root View Controller in some property and call:
- (NSArray *)popToViewController:(UIViewController *)viewController animated:(BOOL)animated
In my application, I have a NSWindow that has a NSTableView object and a few buttons. When the user presses the "new" button, an "ItemAdd" NSWindowController is activated where the user types in attributes for the item to be added to the NSTableView.
My question is this: since NSTableView requires reloadDatato update its view, how do I call reloadData after the ItemAdd window closes and focus shifts back to the NSWindow with the NSTableView.
Thanks for the help!
You could put reload data in a notification handler:
Put this in an initialization method of an object that you want the notification to get called on:
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(didBecomeMainWindow) name:#"NSWindowDidBecomeKeyNotification" object:nil];
Then make a method something like this:
- (void) didBecomeMainWindow
{
[tableView reloadData];
}
You can subclass the NSWindow and override the following method:
- (void)becomeKeyWindow