i have a button in my app a button that submit score to gamecenter and works.
this is the code:
-(void)subScore{
GKScore *scoreRepoter = [[[GKScore alloc] initWithCategory:#"123456"] autorelease];
scoreRepoter.value=100;
[scoreRepoter reportScoreWithCompletionHandler:^(NSError *error) {
if (error!=nil) {
NSLog(#"errr submitting");
}else
NSLog(#"ok!");
}];
now i'd like to submit score before app is closed with home button.
i thought to customize an action of home button (if it is possible)
or perhaps i make the same line of code in viewDidUload...or something like that...
will i be sure that that action will be performed before unloading the app?
i should make that code in dealloc method?
thanks
You can't customize behaviour of Home button directly, but iOS provides some methods in your application's delegate, by which you can control lifecycle of the application.
Method called right before the application goes to background is applicationWillResignActive: in your application's delegate (usually this method is located in AppDelegate.m file).
I think you can get needed effect by calling your method like that:
- (void)applicationWillResignActive:(UIApplication *)application {
[mygame subScore];
}
Also please note that iOS has time limit of execution for this method: you must do all saving-the-game work in less that five seconds or your application will be killed.
Related
I've just added iCloud support to an app that I am working on. Its working great, except that when I open the application without a document in focus the iCloud open file dialog appears and I don't want it to!
In my app delegate I have:
- (BOOL) applicationShouldOpenUntitledFile:(NSApplication *)sender
{
[mainWindowController.window makeKeyAndOrderFront:self];
return NO;
}
Which I use to show my own custom window. However now, both the iCloud open file dialog and my own dialog are displayed. Any ideas on how I can get rid of the iCloud dialog?
https://developer.apple.com/library/prerelease/content/releasenotes/AppKit/RN-AppKitOlderNotes/index.html
NSDocument Support for iCloud
In 10.8, NSDocument-based applications with a ubiquity-container-identifiers entitlement gain new functionality and UI to facilitate iCloud document management.
When iCloud is enabled and an application is first launched or re-activated and no windows are visible or being restored, instead of creating a new Untitled document, NSDocumentController will display a non-modal open panel showing the user's iCloud library.
...
Applications that do not wish to use these features for any or all of their NSDocument subclasses can override +[NSDocument usesUbiquitousStorage] and return NO. If all of the application's declared NSDocument subclasses return NO from this method, then NSDocumentController will never show the new non-modal open panel.
So if you can give up using the features listed in this release note, return NO at +[NSDocument usesUbiquitousStorage].
I confirmed you can still open/save your file into iCloud storage from the normal dialog.
Putting below codes in your App Delegate lets you bypass that iCloud pop up New Document screen. Tested for High Sierra.
-(void)applicationDidFinishLaunching:(NSNotification *)notification
{
// Schedule "Checking whether document exists." into next UI Loop.
// Because document is not restored yet.
// So we don't know what do we have to create new one.
// Opened document can be identified here. (double click document file)
NSInvocationOperation* op = [[NSInvocationOperation alloc]initWithTarget:self selector:#selector(openNewDocumentIfNeeded) object:nil];
[[NSOperationQueue mainQueue] addOperation: op];
}
-(void)openNewDocumentIfNeeded
{
NSUInteger documentCount = [[[NSDocumentController sharedDocumentController] documents]count];
// Open an untitled document what if there is no document. (restored, opened).
if(documentCount == 0){
[[NSDocumentController sharedDocumentController]openUntitledDocumentAndDisplay:YES error: nil];
}
}
- (BOOL) applicationShouldOpenUntitledFile:(NSApplication *)sender
{
[mainWindowController.window makeKeyAndOrderFront:self];
return NO;
}
This part is correct. I've just tested it.
Just make sure your that this class is really your app delegate.
Make a new class called prefixAppDelegate
In your MainMenu.xib, drag a new object to the side and set it's custom class to the app delegate class
Right click Application and drag from Delegate down to your app delegate object.
Now just paste the code above into your app delegate class
If that still doesn't help, try logging something in applicationShouldOpenUntitledFile:.
Also, I recommend not to set [mainWindowController.window makeKeyAndOrderFront:self]; in this method. You should rather use the app delegate method applicationDidFinishLaunching: method.
My observation and fix:
[applicationShouldOpenUntitledFile:] won't be executed except you remove Key NSDocumentClass from *-info.plist. But this is harmful if your app is document based application, it won't open the document type you linked.
My fix is open my customised window directly in -(void)applicationWillFinishLaunching:(NSNotification *)notification method (Application delegate)
ETDocumentWindowController *windowController = (ETDocumentWindowController*)get your own window controller here...;
[windowController.window makeKeyAndOrderFront:nil];
I thought I would share my solution to this issue as I see others still looking for an answer. Its not a great solution but it does the trick.
Subclass NSDocumentController and add the following:
+ (void) setCanOpenUntitledDocument: (BOOL) _canOpenUntitledDocument
{
canOpenUntitledDocument = _canOpenUntitledDocument;
} // End of setCanOpenUntitledDocument:
- (void) openDocument: (id) sender
{
// With iCloud enabled, the app keeps trying to run openDocument: on first launch (before apphasfinishedlaunching gets set.
// This method lets us check and see if the app has finished launching or not. If we try to open a document before
// its finished, then don't let it.
if(!canOpenUntitledDocument)
{
return;
} // End of appHasFinishedLaunching not set
[super openDocument: sender];
} // End of openDocument:
Add the following to your app delegate:
- (void) applicationDidFinishLaunching: (NSNotification *) aNotification
{
// Finished launching. Let us open untitled documents.
[SQLProDocumentController setCanOpenUntitledDocument: true];
...
}
And the reasoning -- By setting a breakpoint in openDocument I've found that its called before applicationDidFinishLaunching, applicationShouldOpenUntitledFile or applicationShouldHandleReopen:hasVisibleWindows: get called, meaning adding those methods is useless. Again, it's not great code but it works and does the trick. (None of the other solutions have worked for me).
I ran into a similar problem -- it turned out that in my case, I had to remove the NSDocumentClass key and value from my Info.plist in the CFBundleDocumentTypes array. Only then would the applicationShouldOpenUntitledFile: method get called and thus allow me to prevent the iCloud/Document window from opening.
I am trying to prevent the Apple implemmntation of taking a screenshot of the current screen contents when an app suspends into the background. I have found a piece of code that sort of works but it comes with a catch. What it does is that it clears the keywindow on the screen so when the snapshot is taken, it is of a blank screen. This is the code snippet for the functionality:
- (void)applicationWillResignActive:(UIApplication *)application
{
[ UIApplication sharedApplication ].keyWindow.hidden = YES;
}
- (void)applicationDidEnterBackground:(UIApplication *)application
{
[ UIApplication sharedApplication ].keyWindow.hidden = YES;
}
The trouble with the above code is that when the app returns to the foreground, the view is gone as it has become hidden and i cannot unhide it with a simple
[ UIApplication sharedApplication ].keyWindow.hidden = NO;
in the applicationWillEnterForeground method of the app delegate. Does anyone know of a way to regain back the hidden view once i have hidden it in the background methods? Right now it is a black screen as the view has been hidden. What exactly happens when you hide a keywindow before going to background and then coming back. is that keywindow you hid before no longer the keywindow? Can anyone point me in the correct direction?
Thanks
Just made a demo project and was able to reproduce your issue. Indeed, the keyWindow property of the application is nil when applicationWillEnterForeground: is called.
Many times, your application's delegate will have a reference to its window - this is usually the Xcode default template for many applications. I was able to resolve the issue by calling
self.window.hidden = NO;
Instead of [UIApplication sharedApplication.keyWindow.hidden = NO;. Assuming that, like most of the templates, your application delegate has a window reference.
Another alternative that worked for me is to call [self.window makeKeyAndVisible];.
All this was done on the iOS 6 simulator.
Hope this helps!
I have a "Splash screen" ViewController extending UIViewController, set as the the initial app VC in my storyboard. This controller features a login form.
When the app starts, and before anything is displayed on the screen, I want this splash VC to check the user defaults to see if the user is already logged in. If so, I want the splash VC to redirect to the app's home VC, all before anything is displayed on the screen.
If the user is not logged in, I want the Splash VC to finish loading, displaying the login forms.
How would I go about implementing this? Would I place all of these checks in the init methods? I was having a hard time getting any code in the splash VC init methods to run at all, for some reason these methods don't get called.
Code in the viewDidLoad method runs fine, but running the code there would defeat the purpose of trying to allow the already-logged-in-user to start the app right into the home screen.
Suggestions? Thanks in advance.
My pick of the place to put this logic is in application didFinishLaunchingWithOptions: of application delegate. Here is how it would look :
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{
//////////////////////////////////////////////
// 1. do loading data etc.
// 2. check whether user is signed in or not
//////////////////////////////////////////////
if(already signed in)
{
dispatch_sync(dispatch_get_main_queue(), ^{
[self.window.rootViewController performSegueWithIdentifier:#"segue identifier to home VC" sender:self.window.rootViewController];
});
}
else
{
dispatch_sync(dispatch_get_main_queue(), ^{
[self.window.rootViewController performSegueWithIdentifier:#"segue identifier to login VC" sender:self.window.rootViewController];
});
}
});
return YES;
}
And this is my quick storyboarding to assist the code. Hopefully you get the idea.
I'm working on an iPad app which is based on a UIWebView: to explain it in the simplest possible terms, the app shows one big interactive webview and in addition it supports custom gestures.
I need to catch events that represent single taps on the webview, but only when the taps have not already been consumed by the webview (i.e. they are not the beginning of a scroll/zoom operation, they are not taps on links, they are not taps that trigger some javascript).
The UIWebView is very greedy with its events, and in my experience it tends not to propagate them, even when they are not consumed. To catch the events, I ended up subclassing the main UIWindow (see http://mithin.in/2009/08/26/detecting-taps-and-events-on-uiwebview-the-right-way/). This is working well, but the problem is I'm not able to recognize whether the taps I'm getting have triggered some javascript in the webview or not.
As an additional restriction, I have no control over the javascript that's going to run in the UIWebView or the HTML that it's going to be displayed.
So, the question goes like this: what would be a way to detect all and only the tap events which did not trigger any other action in the UIWebView itself, especially javascript actions?
~
Should you be curious, the source code of the project I'm working on is on GitHub: to find it, just ask Google to point you to Baker Framework.
Do this with JavaScript. First, after your webview finishes loading, attach a javascript click handler to the body to soak up any unused clicks. Have it load a made-up domain as it's action:
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
NSString *script = #"document.body.onclick = function () { document.location.href = 'http://clickhandler'; }"
[webView stringByEvaluatingJavaScriptFromString:script];
}
Then in your webview delegate, look out for attempts to load that made up domain and intercept them. You now have a way to intercept that javascript click handler with native code and react accordingly:
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
if ([request.URL.host isEqualToString:#"clickhandler"])
{
//handle click
//your logic here
return NO;
}
return YES;
}
I am new to iphone application.I have 6 uiimages in a view.fifth image is facebook and sixth one is twiter.Under images,Iplaced two roundrectbuttons named as click5 and click6. My requirement is,when i click on those images,I have to go to login pages of facebook and twitter.how can i do this?can anyone send me sample example and explain it detai?
If you want to send the user to the website using Safari, you invoke the openURL: method in the UIApplication class, like this:
NSURL *facebookURL = [NSURL URLWithString:#"http://www.facebook.com"];
[[UIApplication sharedApplication] openURL:facebookURL];
When assigning a button to an action, you use the UIButton's addTarget:action:forControlEvents:, providing an event handler as action. Say you're setting this up in viewDidLoad, it might look like this:
- (void) viewDidLoad {
[myButton addTarget:self
action:#selector(btnClicked:)
forControlEvents:UIControlEventTouchUpInside];
}
/**
* Click/tap event handler for some buttons
*/
- (IBAction) btnClicked:(id)sender {
// Check which button was pressed.
if (sender == self.click5) {
// ...
}
else if (sender == self.click6) {
// ...
}
}
You know the very easiest way to do this? With the free 3rd party component ShareKit. It wraps the Facebook and Twitter (and several other social network) APIs to literally make it a three-line deal to post things.
I used it for the first time in the last app I built and I was SHOCKED at how easy to use it was.