I have a TabController View setup and I am attempting to load a new view in the current tab. This view would be loaded depending on a selection from a UIAlertView.
As such I have this code attempting to do so:
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex{
// Yes Button
if (buttonIndex == 0) {
NSLog(#"%# Pressed", [alertView buttonTitleAtIndex:0]);
user = [[UserInfo alloc] initWithNibName:#"UserInfo" bundle:nil];
[self.navigationController pushViewController:user animated:YES];
[user release];
}
// Don't show again Button
if (buttonIndex == 1) {
NSLog(#"%# Pressed", [alertView buttonTitleAtIndex:1]);
}
// No Button
if (buttonIndex == 2) {
NSLog(#"%# Pressed", [alertView buttonTitleAtIndex:2]);
}
}
The Yes block prints out to the console, however the new view does not load. User is an instance of UserInfo, which in turn is a subclass of UIViewController. The Nib UserInfo is created and is part of the project.
What am I missing?
These two lines are unnecessary:
[user.view setHidden:NO];
[self.navigationController setView:user.view];
But this one is:
[user release];
How are you setting up your tab bar controller? Have you placed this view inside of a UINavigationController then added that navigation controller to the TabBarController?
Please review the View Controller Programming Guide for iOS (specifically the Combined ViewController Interfaces section) and verify you are nesting these views correctly.
Is user a global variable? I usually see something like
UserInfo *user = [[UserInfo alloc] initWithNibName:#"UserInfo" bundle:nil];
as the pattern. Since the navigation controller is really going to be the main owner of the view
Related
For a specific server notification I am supposed to show an UIActionSheet. But problem here is when that event comes, at the same time if any UIAlertView already showing on any view controller, it make the UIActionSheet disabled( After pressed ok for alert view I am not able to select anything on view controller , view got disabled because of UIActionSheet). Anyone faced this kind of problem, Any idea how to solve it?
I have tried by dismissing alert view before showing action sheet, however which alert view do I need to dismiss as I have many alert view in many controller. All are local to that controllers. How to solve this problem.
Note:
Same problem won't come for iPod, as it wont allow to click ok before responding to UIActionSheet.
Take a Global Alert view named it as activeAlertView. Now when you show a alert view please check that alert view and then show and assign. Like
declare a property in .h and synthesize it
#property (nonatomic, retain) UIAlertView *activeAlertView;
then use the below code when try to show an alert.
if(self.activeAlertView){
[self.activeAlertView dismissWithClickedButtonIndex:0 animated:YES];
}
UIAlertView *localAlert = [[UIAlertView alloc] initWithTitle:#"Title" message:#"Your message" delegate:nil cancelButtonTitle:#"cancel" otherButtonTitles:nil, nil ];
[localAlert show];
self.activeAlertView = localAlert;
[localAlert release];
this way your activeAlertview will keep the current aler view's reference and before show the actionSheet dismiss the alert view.
For Identified which alert-view you must set Tag or alert-view.
Ex:-
alertviewName.tag=1;
Then you can check is there alert-view Open in Particular view-controller sub-views use bellow code like:-
- (BOOL) doesAlertViewExist {
for (UIView* view in yuorviewcontroller.view.subviews) {
BOOL alert = [view isKindOfClass:[UIAlertView class]];
if (alert)
{
return YES;
}
}
return NO;
}
After this method called you get BOOL value YES or NO If Yes then dismiss it using UIAlertview's Delegate:-
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex;
and put your Actionsheet appear code into didDismissWithButtonIndex method.
When the message comes, first check if there is an alert view.
Show the action sheet after the alert view is dismissed. In didDismiss... you can check a BOOL flag if you now have to show the action sheet or not.
In this case, you should use
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
method rather than,
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
so your code wil be:
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 0)
{
UIActionSheet *actionSheet = ...
[actionSheet showFromTabBar:self.tabBarController.tabBar];
}
}
Thanks
try this:
for (UIWindow* w in [UIApplication sharedApplication].windows)
{
for (NSObject* obj in w.subviews)
{
if ([obj isKindOfClass:[UIAlertView class]])
{
[(UIAlertView*)obj dismissWithClickedButtonIndex:[(UIAlertView*)obj
cancelButtonIndex] animated:YES];
}
}
}
In my app when the user clicks a button it calls a prepareForSegue. The app need to check a state and then prompt the user if they want to over write or delete. Problem is that it loads the next view controller before the UIActionSheet is displayed. How can I force the UIActionSheet to appear before the prepareForSegue is called? This is my logic for prepareForSegue;
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
if ([[segue identifier] isEqualToString:#"mySegue"]) {
//Check Logic removed for simplicity
if ([myCheck count] > 0){
UIActionSheet *actionSheet = [[UIActionSheet alloc]
initWithTitle:#"Save?"
delegate:self
cancelButtonTitle:#"Delete"
destructiveButtonTitle:#"Save"
otherButtonTitles:nil];
[actionSheet showFromToolbar:self.navigationController.toolbar];
}
}
}
Here is the Action sheet;
- (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex
{
if (buttonIndex == [actionSheet cancelButtonIndex])
{
//Delete logic removed
}else {
//Save logic removed
}
}
You won't be able to do it in a segue. You'll have to load the view controller manually in your action sheet handler when you get the button index that’s supposed to trigger it. That means whatever is triggering the segue now will have to be disconnected and pointed at an IBAction that will create and show your action sheet. prepareForSegue is intended to allow you to set parameters on your destination view controller prior to displaying it. The segue has already been set in motion by the time you get to prepareForSegue. At that point, there is no going back/canceling/delaying the performing of the segue.
Best Regards.
I have found it possible To peform a Segue from a action Sheet
As long as The segue Is from the View controller and and an Identifier here is a example.
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
if (buttonIndex == [actionSheet cancelButtonIndex]) return;
if (buttonIndex == 0) {
[self performSegueWithIdentifier:#"visitWeb" sender:self];
}
if (buttonIndex == 1) {
if ([MFMailComposeViewController canSendMail])
{
Might not be the correct way as I'm a bit of a newb but for my modal view controller on StoryBoard it seems to do the trick
Creating an action sheet is an asynchronous event and does not block the segue. You'll need to trigger the segue from your action sheet.
In my window base application I need to navigate to informationview from my appdelegate when i click on alert view button.
alert view works with NSlog.
But i need to push to the other view for this purpose i used
[self.navigationController pushViewController:info animated:YES];
but it doesn't pushes. just nslog only prints
- (void)applicationDidBecomeActive:(UIApplication *)application
{
//To count the number of launches
NSInteger i = [[NSUserDefaults standardUserDefaults] integerForKey:#"numOfCalls"];
[[NSUserDefaults standardUserDefaults] setInteger:i+1 forKey:#"numOfCalls"];
NSLog(#"the number of active calls are %d",i%3);
if(i%3==0 && i!=0)
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"you might prefer MedChart+" message:#"Get it now for more options" delegate:self cancelButtonTitle:#"Cancel" otherButtonTitles:#"Ok",nil];
[alert show];
[alert release];
}
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 0)
{
NSLog(#"canceled");
}
else if (buttonIndex == 1)
{
NSLog(#"Pushed to the information view ");
InformationViewCotroller *info = [[InformationViewCotroller alloc]initWithNibName:#"InformationViewCotroller" bundle:nil];
[self.navigationController pushViewController:info animated:YES];
}
}
(dont consider 'i' values it is part of my logic).
Thanks in advance
Before Navigate to any viewController , set the RootController for your navigationController of appDelegate.
Add navigationController.View as subview of window.Then your root controller will be the first ViewController.from there you can push to any viewController.
In my app I have a xib that has several viewcontrollers and xibs (with more viewcontrollers)off of it.
I can go from xib to xib and load what ever view controllers I want.
My problem is when I go to a view in side one off my viewcontrollers (be it on the main xib or another) I have a navigation bar at the bottom with a single button marked "back". Now when this button is hit before it takes you back It asks if you want something to happen.
When you click yes a UIAlertView will pop up and tell you wants about to happen when you click "ok". I know my button is firing by NSLogging my tag.
However I need a certain xib file to load and it does not.
This is the code that I am trying to use -- now this works If I want to go from xib to xib from a button. So I am not sure why its not working in an alert view.
- (void)alertView:(UIAlertView *)alert clickedButtonAtIndex:(NSInteger)buttonIndex {
// the user clicked one of the OK/Cancel buttons
if(alert.tag==1)
{
if (buttonIndex==0) {
ControllPanelViewController *controllpanel = [[ControllPanelViewController alloc] initWithNibName:nil bundle:nil];
[self presentModalViewController:controllpanel animated:YES];
NSLog(#"index 0");
}
}
}
Adding pic do to a response:
I have had similar problems before, not with a UIViewController, but with a UIActionSheet. When I tried to do this, I wanted to present a UIActionSheet depending on the selection of the UIAlertView. When I pressed something in the UIAlertView, the view was dismissed, but my action sheet was not shown. This was my solution; instead of:
if(alert.tag==1) {
if (buttonIndex==0) {
ControllPanelViewController *controllpanel = [[ControllPanelViewController alloc] initWithNibName:nil bundle:nil];
[self presentModalViewController:controllpanel animated:YES];
NSLog(#"index 0");
}
}
try something like:
if(alert.tag==1)
if (buttonIndex==0)
[self performSelector:#selector(presentController) withObject:nil afterDelay:.1];
with the method presentController being:
ControllPanelViewController *controllpanel = [[ControllPanelViewController alloc] initWithNibName:nil bundle:nil];
[self presentModalViewController:controllpanel animated:YES];
NSLog(#"index 0");
The problem seems to be that the UIAlertView takes some time to dismiss itself (very small amount of time) and in that time presenting another view doesn't work.
Also, as Alan Zeino said, if the name of the xib is not the same as the name of the view controller (for example if you have two different xibs- one for ipad and one for iphone), then you do need to specify which to use. If the name of the xib is the same as the view controller, you do not have to specify a name.
Edit:
If you want to use an action sheet and expect the delegate methods to work when their actions are triggered, you'd better set the delegate of the action sheet to self and in your interface file add the protocol.
You need to specify the xib you want to open:
ControllPanelViewController *controllpanel = [[ControllPanelViewController alloc] initWithNibName:#"XibNameHere" bundle:nil];
Since you have indicated that your log statement confirms correctly setting delegate and implementing the methods, the 'UIAlertView locks the screen' theory seems the only expectable one.
As Rickay has said performSelector:AfterDelay: would likely work, but as he has also said that requires a second method to be created. I would say that this is the perfect time for a block.
Here are a couple of options: Either should be copy and paste solutions.
1) Assuming the current main runloop simply has to finish it's current call stack before the new view controller can be pushed you could use:
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
if (alertView.tag == 1) {
if (buttonIndex == 0) {
dispatch_async(dispatch_get_main_queue(), ^{
ControllPanelViewController *controllpanel = [[ControllPanelViewController alloc] initWithNibName:nil bundle:nil];
[self presentModalViewController:controllpanel animated:YES];
});
}
}
}
This will add a block to the main queue that will create and show your ControllPanelViewController as soon as the main run loop becomes available.
If, however, that doesn't work and it is 'just a matter of time', a block will still work. Like So:
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
if (alertView.tag == 1) {
if (buttonIndex == 0) {
double delayInSeconds = 0.1;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
ControllPanelViewController *controllpanel = [[ControllPanelViewController alloc] initWithNibName:nil bundle:nil];
[self presentModalViewController:controllpanel animated:YES];
});
}
}
}
This will create a block that will 'fire' in the number of seconds specified. Here set to 0.1 seconds.
Again the first one is a cleaner, arguably better, and much easier to read option.
I have an iPhone app that uses an action sheet but I can't work out how to make one of the buttons open a new view when pressed. I know how to implement the action sheet - that's not a problem, its the actual action of opening the new view that's the issue.
Any help would be greatly appreciated. Thanks.
I usually just create a new method and have the action sheet do it.
For instance:
switch (buttonIndex) {
case 0:
[self openModalView];
break;
}
Then, in your openModalView method:
- (void)openModalView {
MyModalViewController *myController = [[MyModalViewController alloc] init];
[self presentModalViewController:myController animated:YES];
[myController release];
}
In the UIAlertView's -didDismissWithButtonIndex, instantiate your new view controller and push it onto the navigation stack:
- (void)alertView:(UIAlertView *)alertView
didDismissWithButtonIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 0)
{
NewViewController *controller = [[NewViewController alloc] init];
[[self navigationController] pushViewController:controller animated:YES];
[controller release], controller = nil;
}
}