How can I use UIAlertViewController in appdelegate class.
if you want to show in UIAlertviewController in Appdelegate, you can do it two ways
Choice-1
Initially you get the visible/Top ViewController from window , assume that you were in some where on any viewcontrollerm at that time you access that from root view controller , use this
UIViewController *vc = [self visibleViewController:[UIApplication sharedApplication].keyWindow.rootViewController];
//second add your present on`UIAlertController`
[vc presentViewController:alert animated:YES Completion:nil];
For get which viewcontroller at visible for Reference purpose I take the answer From here
- (UIViewController *)visibleViewController:(UIViewController *)rootViewController
{
if (rootViewController.presentedViewController == nil)
{
return rootViewController;
}
if ([rootViewController.presentedViewController isKindOfClass:[UINavigationController class]])
{
UINavigationController *navigationController = (UINavigationController *)rootViewController.presentedViewController;
UIViewController *lastViewController = [[navigationController viewControllers] lastObject];
return [self visibleViewController:lastViewController];
}
if ([rootViewController.presentedViewController isKindOfClass:[UITabBarController class]])
{
UITabBarController *tabBarController = (UITabBarController *)rootViewController.presentedViewController;
UIViewController *selectedViewController = tabBarController.selectedViewController;
return [self visibleViewController:selectedViewController];
}
UIViewController *presentedViewController = (UIViewController *)rootViewController.presentedViewController;
return [self visibleViewController:presentedViewController];
}
Swift
let navigationController = application.windows[0].rootViewController as UINavigationController
let vc = navigationController.visibleViewController
vc.presentViewController(alert, animated: true, completion: nil)
Choice-2
If you want to present the UIAlertController in directly in Appdelegetae , do like simple
[self.window.rootViewController presentViewController:alert animated:YES Completion:nil];
Update
[ [[[UIApplication sharedApplication] keyWindow] rootViewController] presentViewController:alert animated:YES Completion:nil];
Related
We know , if your viewController have been contain UINavigationController ,
you can find your current visible view controller by 'self.navigationController.visibleViewController' .
But I you present a view controller , how to find current visible controller ?
For Example :
code one :
------
AVClr *avclr = [[AVClr alloc]init] ;
AppDelegate *appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate ;
appDelegate.window.rootViewController = avclr ;
[avclr presentViewController:loginNavClr animated:YES completion:nil] ;
---> now , display avclr
code two:
------
AppDelegate *appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate ;
UIViewController *currentVisibleViewController = appDelegate.window.rootViewController ;
BVClr *bvclr = [[BVClr alloc]init] ;
[currentVisibleViewController presentViewController:bvclr animated:YES completion:nil] ;
---> now , display bvclr
code three:
------
AppDelegate *appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate ;
UIViewController *currentVisibleViewController = appDelegate.window.rootViewController ;
CVClr *cvclr = [[CVClr alloc]init] ;
[currentVisibleViewController presentViewController:cvclr animated:YES completion:nil] ;
---> Error , can not display cvclr , because avclr is a rootViewController and avclr present bvclr , so display bvclr .
Question:
But we know ,code three in another .m file , so we don't know who is the rootViewController . so If I present cvclr , the result is unexpect !
In the circumstances ，how to display cvclr
-(UIViewController *)getVisibleViewController : (UIViewController *)rootViewController
{
UIViewController *rootVC = rootViewController;
if (rootVC == nil)
{
rootVC = [[[UIApplication sharedApplication] keyWindow] rootViewController];
}
if ([rootVC presentedViewController] == nil)
{
return rootVC;
}
if ([rootVC presentedViewController] != nil)
{
if ([[rootVC presentedViewController] isKindOfClass:UINavigationController.self]) {
UINavigationController *navigationController = (UINavigationController *)[rootVC presentedViewController];
return [[navigationController viewControllers] lastObject];
}
return [self getVisibleViewController : [rootVC presentedViewController]];
}
return nil;
}
to find current top view controller i used this method
- (UIViewController *)currentTopViewController
{
UIViewController *topVC = [[[[UIApplication sharedApplication] delegate] window] rootViewController];
while (topVC.presentedViewController)
{
topVC = topVC.presentedViewController;
}
if ([topVC isKindOfClass:[UINavigationController class]]) {
return [(UINavigationController *)topVC topViewController];
}
return topVC;
}
If you are presenting the next screen from that class then you don't need to fetch top view controller from UIWindow
Simply use this..
-----------------
AVClr *avclr = [[AVClr alloc]init];
[self presentViewController: avclr animated:YES completion:nil] ;
------------------------------
BVClr *bvclr = [[BVClr alloc]init] ;
[self.presentingViewControler presentViewController:bvclr animated:YES completion:nil] ;
------------------
CVClr *cvclr = [[CVClr alloc]init] ;
[self.presentingViewControler presentViewController:cvclr animated:YES completion:nil] ;
This code also check UITabbarViewContoller :
-(UIViewController *) getVisibleViewContoller {
UIViewController *rootViewController = UIApplication.sharedApplication.keyWindow.rootViewController;
if (!rootViewController) {
return nil;
}
if ([rootViewController isKindOfClass:[UITabBarController class]]) {
UITabBarController *tabbarVC = (UITabBarController *) rootViewController;
UIViewController *selectedVC = tabbarVC.selectedViewController;
if (selectedVC) {
if (![selectedVC isKindOfClass:[UINavigationController class]]) {
return selectedVC;
}
rootViewController = selectedVC;
}
}
if ([rootViewController isKindOfClass:[UINavigationController class]]) {
UINavigationController *navigationVC = (UINavigationController *) rootViewController;
if (navigationVC.topViewController) {
return navigationVC.topViewController;
}
return navigationVC.viewControllers.lastObject;
}
return rootViewController;
}
I am automating IOS app test cases using Appium. I have a scenario in which I have to identify.. i am on which screen so that I can close the screen
In broader view , we have a inapp notification in our app which get open in random way.
So I can handle these condition if I would be able to identify the current screen.
I handle the same thing in Android using driver.currentActivity method
I need the some kind of same method for IOS apps
you get top most view controller by using below method
+ (UIViewController*) topMostController
{
UIViewController *topController = [UIApplication sharedApplication].keyWindow.rootViewController;
while (topController.presentedViewController) {
topController = topController.presentedViewController;
}
return topController;
}
Or if you have navigation or UIabbar controller then use below method to get visible view controller
- (void)applicationWillResignActive:(UIApplication *)application
{
UIViewController *vc = [self visibleViewController:[UIApplication sharedApplication].keyWindow.rootViewController];
}
- (UIViewController *)visibleViewController:(UIViewController *)rootViewController
{
if (rootViewController.presentedViewController == nil)
{
return rootViewController;
}
if ([rootViewController.presentedViewController isKindOfClass:[UINavigationController class]])
{
UINavigationController *navigationController = (UINavigationController *)rootViewController.presentedViewController;
UIViewController *lastViewController = [[navigationController viewControllers] lastObject];
return [self visibleViewController:lastViewController];
}
if ([rootViewController.presentedViewController isKindOfClass:[UITabBarController class]])
{
UITabBarController *tabBarController = (UITabBarController *)rootViewController.presentedViewController;
UIViewController *selectedViewController = tabBarController.selectedViewController;
return [self visibleViewController:selectedViewController];
}
UIViewController *presentedViewController = (UIViewController *)rootViewController.presentedViewController;
return [self visibleViewController:presentedViewController];
}
In my application i am adding the child view controller using the following code.
self.onlineUserList = [[UIStoryboard storyboardWithName:#"Main" bundle:nil] instantiateViewControllerWithIdentifier:#"OnlineUserList"];
UINavigationController *navController=[[UINavigationController alloc]initWithRootViewController:self.onlineUserList];
self.onlineUserList.delegate = self;
navController.navigationBar.hidden = YES;
CGRect aRect = [[UIScreen mainScreen] bounds];
[navController.view setFrame:(CGRect){0, 0, aRect.size.width, aRect.size.height-47}];
[self addChildViewController:navController];
[self.view addSubview:navController.view];
[self didMoveToParentViewController:navController];
And i am removing the child view controller using following code.
[_onlineUserList removeFromParentViewController];
[_onlineUserList.view removeFromSuperview];
[_onlineUserList didMoveToParentViewController:nil];
It is working well. But after removing the child view controller then i am not able to do any action on the parent view controller. I think i am missing some thing navigational flow. Please help me.
Just get all Viewcontrollers in array , check this .
If you want all view controller of navigation ,
NSArray *currentControllers = self.navigationController.viewControllers;
if you want first pushedviewcontroller ,
UIViewController *firstcontroller = self.navigationController.viewControllers.firstObject;
if you want last object ,
UIViewController *Lastcontroller = self.navigationController.viewControllers.lastObject;
Now trace with this code , which viewcontroller you are removing .
or Another way is just give identifier of your parentviewcontroller in didfinishlaunchwithoption , like ,
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"Main" bundle:[NSBundle mainBundle]];
SlideMenu = [storyboard instantiateViewControllerWithIdentifier:#"SlideMenu"];
then add method for topviewcontroller,
- (UIViewController *)topViewController{
return [self topViewController:[UIApplication sharedApplication].keyWindow.rootViewController];
}
- (UIViewController *)topViewController:(UIViewController *)rootViewController
{
if (rootViewController.presentedViewController == nil) {
return rootViewController;
}
if ([rootViewController.presentedViewController isKindOfClass:[UINavigationController class]]) {
UINavigationController *navigationController = (UINavigationController *)rootViewController.presentedViewController;
UIViewController *lastViewController = [[navigationController viewControllers] lastObject];
return [self topViewController:lastViewController];
}
UIViewController *presentedViewController = (UIViewController *)rootViewController.presentedViewController;
return [self topViewController:presentedViewController];
}
now create one more method in your appdelegate to present your parentviewcontroller like ,
- (void)ShowMenu{
[SlideMenu ShowToViewController:[self topViewController]];
}
and then when you remove childviewcontroller then call ,
[[AppDelegate mainDelegate] ShowMenu];
I hope this info enough to solve your issue.
There are three controllers here, AViewController, BViewController, CViewController,
the first step: AViewController present to BViewController;
BViewController *BVC = [[BViewController alloc]init];
[self presentViewController:BVC animated:YES completion:nil];
The second step: BViewController push to CViewController;
CViewController *CVC = [[CViewController alloc]init];
UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:CVC];
[self.navigationController pushViewController:nav animated:YES];
Now, if I want to go back from CViewController to AViewController, what code should I write?
Just use this code:
self.dismissViewControllerAnimated(true, completion: nil)
to dismiss C ViewController, because C ViewController is now on the Navigation Stack. A present a navigation controller that contain B ViewController. B ViewController push C ViewController, so C is still in Navigation Controller.
You can look at my project here:
https://github.com/khuong291/TestTransition
You should present BViewController like this:
BViewController *BVC = [[BViewController alloc]init];
UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:BVC];
//Setting For Transparent
nav.providesPresentationContextTransitionStyle = YES;
nav.definesPresentationContext = YES;
nav.modalPresentationStyle = UIModalPresentationOverCurrentContext;
[self presentViewController:nav animated:YES completion:nil];
and in BViewController implement:
- (void)viewWillDisappear:(BOOL)animated {
[self.navigationController setNavigationBarHidden:YES];
}
- (void)viewWillDisappear:(BOOL)animated{
[self.navigationController setNavigationBarHidden:NO];
}
And you can push to CViewController:
CViewController *CVC = [[CViewController alloc]init];
[self.navigationController pushViewController:CVC animated:YES];
And when you want back to A. Simple call it in C:
[self dismissViewControllerAnimated:YES completion:nil];
In my card playing game I am trying to create a match, which, for a part, works;
- (void)matchmakerViewController:(GKMatchmakerViewController *)viewController didFindMatch:(GKMatch *)match {
self.match = match;
match.delegate = self;
if (!_matchStarted && match.expectedPlayerCount == 0) {
NSLog(#"Ready to start match!");
UIStoryboard *sb = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
UIViewController *vc = [sb instantiateViewControllerWithIdentifier:#"GameVC"];
vc.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[viewController presentViewController:vc animated:YES completion:nil];
//[viewController dismissViewControllerAnimated:YES completion:nil];
}
}
After a match is created successfully I want the GKMatchmakerViewController to be dismissed and I want the "vc" UIViewController to be shown. In the above example this is accomplished, but the GKMatchmakerViewController does not get dismissed.
If I remove the comment quotes it will be loaded after it got dismissed somehow and if I place the line above the presentViewController line I get an error stating that I am trying to present a view controller on a view controller that is not in the view hierarchy.
How do I dismiss the GKMVC and show the "vc" at the "same" time?
Thanks!
You need to dismiss the GKMatchMakerViewController, then use your current view controller to present the new modal:
if (!_matchStarted && match.expectedPlayerCount == 0) {
NSLog(#"Ready to start match!");
UIStoryboard *sb = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
UIViewController *vc = [sb instantiateViewControllerWithIdentifier:#"GameVC"];
vc.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[viewController dismissViewControllerAnimated:YES completion:nil];
[self presentViewController:vc animated:YES completion:nil];
}
Edit: A trick to get the current root view controller is [[UIApplication sharedApplication] delegate].window.rootViewController. So you should be able to present your modal with this:
[[[UIApplication sharedApplication] delegate].window.rootViewController presentViewController:vc animated:YES completion:nil];