I have a class that has an extension of UIButton that shows a UIAlertview under certain circumstance.
#interface CellButton : UIButton {}
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"You Lose!"
message:#"Play Again?"
delegate:self
cancelButtonTitle:#"OK"
otherButtonTitles:#"cancel", nil];
[alert show];
This works fine, but I need to present a view controller when user presses ok.But as you may know you cannot present a view controller with an extension of UIButton.
So I was wondering if I can put the code below in another viewcontroller and allow it to work with the UIAlert in Cellbutton class.
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
if (buttonIndex == 0) { // and they clicked OK.
GameController*myNewVC = [[GameController alloc] init];
[self presentModalViewController:myNewVC animated:NO];
}
}
You don't do it inside the UIButton.
The target of clicking the UIButton should be a UIViewController. After that, show an alert view FROM the view controller, and the view controller will be the delegate of the UIButton. From their everything will work fine.
This would work as long as you have set the alert view delegate to the view controller you want to handle the presentation.
I would suggest moving all of the functionality to the view controller though, i.e. present and handle the alert view from the same view controller, this can be triggered from an event from the button. I think this makes the code more readable and it doesn't really make sense for a button to know about alert views
You can declare a global variable (in appDelegate - and how to do it HERE) then ;
1 - set the variable 1 when user click button
2 - get the value from other viewcontroller's action
if the value is 1 then go ahead.
Related
I am working on a conference based application. I want to show an incoming call window to the user, I am using UIActionSheet to show that notification. Now, the problem here is that the call may come at any time from the server, at that we may be in our application any view, how can I show the incoming call notification using UIActionSheet? What delegate I have to set?
UIActionSheet *actionSheet = [[UIActionSheet alloc]
initWithTitle:msg_string
delegate:(id)??????????????????
cancelButtonTitle:#"ACCEPT"
destructiveButtonTitle:#"DECLINE"
otherButtonTitles: nil];
Any suggestion is greatly appreciated.
Thanks.
an object that is guaranteed to be alive; e.g. the application's delegate. also, in a typical iOS application structure, it has a reference to the top level of the view hierarchy. -Alan
you should set like below.
UIActionSheet *actionSheet = [[UIActionSheet alloc]
initWithTitle:msg_string
delegate:self
cancelButtonTitle:#"ACCEPT"
destructiveButtonTitle:#"DECLINE"
otherButtonTitles: nil];
delegate is class where to UIActionSheetDelegate method is implemented.
like e.g
#implementation ViewController
-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{ // you code }
#end
so clickedButtonAtIndex is actionSheet delegate method which is in viewController Class and you alertView also shown from ViewController Class then you have to set self. or if alertView shown from other class and delegate method body written in ViewController class then as delegate you need to set object of ViewController class.
I have an educational app working fine with tab bars. One of the tabs is a test for the user. If a user taking the test selects another tab, I would like an action sheet to display to confirm they really want to exit the test since their test results will be lost.
I can't get the action sheet to display. I am getting syntax errors with the first three examples below. The 4th example will compile OK but the app aborts. I can't figure out what should go after the self. Or possibly one of the other examples would work if I had the syntax correct.
- (void)tabBarController:(UITabBarController *)tabBarController
didSelectViewController:(UIViewController *)viewController {
NSLog(#"Tab Bar Controller reached");
UIActionSheet *actionSheet = [[UIActionSheet alloc]
initWithTitle:#"This will end the test.
Are you sure you want to leave?"
delegate:self
cancelButtonTitle:#"Cancel"
destructiveButtonTitle:#"Yes,
cancel the test."
otherButtonTitles:nil];
[actionSheet showInView:self.view];
[actionSheet showInView:elements1AppDelegate.window];
[actionSheet showFromTabBar:self.tabBarController.tabBar];
[actionSheet showFromTabBar:self];
Ultimately, once I get the action sheet to display, I will either proceed to the tab selected or stay in the test view depending on whether the user decides to exit or not. Any help/suggestions would be appreciated. Thanks.
The name of the method tabBarController:didSelectViewController: should indicate that it's too late to stop the selection. Its return type void indicates there is not much you can do about it. Instead focus on method names that have "will" or "should" in them, and return types like BOOLs such as tabBarController:shouldSelectViewController:. So here is some basic code that does what you want.
I don't know the actual classname of your test's view controller so I'll use QuizController as a classname. QuizController is a UIViewController subclass.
QuizController.m
#interface QuizController () <UITabBarControllerDelegate,UIActionSheetDelegate>{
BOOL _testInProgress;
}
#end
#implementation QuizController
-(void)viewDidAppear:(BOOL)animated{
[super viewDidAppear:animated];
// When a tabs view controller is presented viewDidAppear: will be called so here we will set this view controller as the tabBarController delegate so we get the callback.
self.tabBarController.delegate = self;
}
-(void)startQuiz{
_testInProgress = YES;
// Begin testing code
}
-(void)stopQuiz{
// Score test record results
_testInProgress = NO;
}
-(void)cancelQuiz{
// Throw out results
_testInProgress = NO;
}
-(BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController{
if (!_testInProgress) return YES;
// If trying to select this controller then who cares?
if (viewController == self) return YES; // Or NO. Just don't show the sheet.
UIActionSheet *action = [[UIActionSheet alloc] initWithTitle:#"You are in the middle of a test. Are you sure you want to switch tabs?"
delegate:self
cancelButtonTitle:#"Continue Test"
destructiveButtonTitle:#"Abort Test"
otherButtonTitles:nil];
// Lets cheat and use the tag to store the index of the desired view controller.
action.tag = [self.tabBarController.viewControllers indexOfObject:viewController];
[action showFromTabBar:self.tabBarController.tabBar];
return NO;
}
-(void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex{
if (buttonIndex == actionSheet.destructiveButtonIndex){
[self cancelQuiz];
// The above cheat pays off.
[self.tabBarController setSelectedIndex:actionSheet.tag];
}
}
EDIT (In response to comment quoted)
I'm a little confused about your example. Currently, my "take test"
class is a UIViewController. Are you suggesting I replace that with
your QuizController above?
No. I am suggesting that you take this code and integrate the design pattern into your UIViewController subclass that handles your test. Although this is a working example (providing you supply UI to toggle the _testInProgress ivar.)
Do I leave my current UITabBarController in place?
Yup.
That is currently my appdelegate and rootController.
Huh? Your UITabBarController is almost certainly your rootViewController. But unless you have done something very odd like AppDelegate : UITabBarController <UIApplicationDelegate>, by the way don't do that, then it is extremely unlikely that your "appdelegate" and your UITabBarController are the same. Much more likely your AppDelegate is your tabBarController's delegate.
If just setting the tabBarController.delegate property on appearance is bad (and it could very well be), i.e. some other object needs to be the tabBarController's delegate, then you'll have to forward a message to that view controller to see if a test is in progress. For this you could actually leave almost all of the code in the example unchanged. Of course you would have to remove the self.tabBarController.delegate = self; in viewDidAppear:. And put the following in your AppDelegate(presuming that's the tabBarController's delegate):
-(BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController{
if ([tabBarController.selectedViewController respondsToSelector:#selector(tabBarController:shouldSelectViewController:)]){
return [(NSObject <UITabBarControllerDelegate>*)tabBarController.selectedViewController tabBarController:tabBarController shouldSelectViewController:viewController];
}
return YES;
}
This implementation essentially forwards the responsibility to answer the question to the view controller, provided it will answer the question.
I check in there if the "take test" tab was selected and call an
initialization method in my "take test" class.
In my opinion the "take test" view controller should simply become selected when the user taps the tab for it. And its view should contain a button with something to the effect of 'start test' on it. But that's just my opinion.
But whatever the case is the application's knowledge of whether the user is taking a test should reside in the view controller that administers the test.
[actionSheet showInView:[[[UIApplication sharedApplication] windows] objectAtIndex:0]];
Did you try this One Link
I have an actionsheet that seems to only call the clickedButtonAtIndex delegate method when I click the "Yes" button, but not on the "No" button... Here's the code:
self.myActionSheet = [[UIActionSheet alloc] initWithTitle:#"Test" delegate:self
cancelButtonTitle:#"No" destructiveButtonTitle:#"Yes" otherButtonTitles:nil];
[self.myActionSheet showInView:self.view];
[myActionSheet release];
then the delegate method:
- (void)actionSheet:(UIActionSheet *)myActionSheet
clickedButtonAtIndex:(NSInteger)buttonIndex {
if (buttonIndex == 1) {
[self.myActionSheet dismissWithClickedButtonIndex:1 animated:YES];
return;
}
My breakpoint at the first line of this procedure doesn't get hit unless I touch the
"Yes" button. I have changed this to have the cancelButtonTitle:nil and then put the "No" on another button (otherButtonTitles:#"No", nil). Same thing.
Any help?
Thanks!
Try touching the very top of the No button. Does it work?
Do you have a tab bar or a tool bar? If so, try showing the action sheet from the tab bar or the tool bar. The No button could be partially obscured by the bar.
No, its not a bug.. just a "Real Estate" issue.
take a look at the API.. from the UIActionSheet header...
// show a sheet animated. you can specify either a toolbar, a tab bar, a bar butto item or a plain view. We do a special animation if the sheet rises from
// a toolbar, tab bar or bar button item and we will automatically select the correct style based on the bar style. if not from a bar, we use
// UIActionSheetStyleDefault if automatic style set
- (void)showFromToolbar:(UIToolbar *)view;
- (void)showFromTabBar:(UITabBar *)view;
- (void)showFromBarButtonItem:(UIBarButtonItem *)item animated:(BOOL)animated __OSX_AVAILABLE_STARTING(__MAC_NA, __IPHONE_3_2);
- (void)showFromRect:(CGRect)rect inView:(UIView *)view animated:(BOOL)animated __OSX_AVAILABLE_STARTING(__MAC_NA, __IPHONE_3_2);
- (void)showInView:(UIView *)view;
My modal view controllers are being shown behind my UIActionSheet, and my UIActionSheet is not getting dismissed. I am using:
[self presentModalViewController:composeTweetView animated:YES];
To present my modal view controller.
My action sheet is being shown from the tabBar:
[actionSheet showFromTabBar:self.parentViewController.tabBarController.tabBar];
This code worked on iOS 4.0.
if (buttonIndex == 0) {
if (self.isLoggedIn) {
[FlurryAPI logEvent:#"ST_REPLY_CLICKED"];
composeTweetView.isDirectMessage = FALSE;
[self presentModalViewController:composeTweetView animated:YES];
[composeTweetView release];
}
else {
LoginViewController* loginView = [[LoginViewController alloc] initWithNibName:#"LoginViewController" bundle:nil];
loginView.delegate = self;
loginView.isPostingComment = TRUE;
self.isReply = TRUE;
[self presentModalViewController:loginView animated:YES];
[loginView release];
[composeTweetView release];
}
}
Summary:
I have a UIViewController that contains a UITabBar. I am presenting a UIActionSheet which has a few buttons that present a modal view controller. When the modal view controller is presented, the UIActionSheet should dismiss itself and the modal view should be on the top of the stack. The problem is, the UIActionSheet does not dismiss, and the modal view is loaded behind it. This problem did not occur up until iOS 4.2.1
Steps to Reproduce:
Create a TabBar project, setting
your Base SDK to iOS 4.2.1
Create a button or trigger to show a UIActionSheet
Allow one of the buttons in the UIActionSheet to present a modal view controller using the syntax: [actionSheet showFromTabBar:self.parentViewController.tabBarController.tabBar];
Expected Results:
1. The UIActionSheet should dismiss itself, and the modal view should appear in front
Actual Results:
1. The UIActionSheet does not get dismissed and the modal view appears behind it.
Regression:
This problem was not apparent prior to iOS 4.2.1
Notes:
I have tried other ways of displaying the UIActionSheet all of which don't work as intended:
//[actionSheet showInView:self.parentViewController.tabBarController.tabBar];
//[actionSheet showInView:[self.view window]];
//[actionSheet showInView:self.parentViewController.tabBarController.view];
//[actionSheet showInView:[UIApplication sharedApplication].keyWindow];
In putting together a sample in order to reproduce your problem I took a look at the UIActionSheet delegate methods. I believe you can use:
actionSheet:didDismissWithButtonIndex:
instead of
actionSheet:clickedButtonAtIndex:
I haven't tested it, but I believe you still get the same button number and it doesn't fire until the actionsheet has disappeared from the view.
I don't understand your problem sorry but everything works great for me. I have tried the following code in Simulator and on 4.2.1 iPod Touch 4G (both worked)
- (IBAction)doit {
UIActionSheet *actionSheet = [[UIActionSheet alloc]initWithTitle:#"title" delegate:self cancelButtonTitle:#"not OK" destructiveButtonTitle:#"Absolutely" otherButtonTitles:nil];
[actionSheet showFromTabBar:self.tabBarController.tabBar];
[actionSheet release];
}
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
if (buttonIndex == 0) {
UIView *v = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];
v.backgroundColor = [UIColor redColor];
[self.view addSubview:v];
[v release];
}
}
created the TabBar sample project
added button to firstView-nib and connected with the appropriate IBAction (have to name the FileOwner to FirstViewController)
set the delegate method in FirstViewController.h (<UIActionSheetDelegate>)
added the code above
//EDIT: ok I saw that you want to present it modally but even this works for me on 4.2.1
TMPController *tmp = [[TMPController alloc]initWithNibName:#"TMP" bundle:nil];
[self presentModalViewController:tmp animated:YES];
[tmp release];
maybe it works because I use self.tabBarController.tabBar, try that
Not sure if you have already resolved this. But I didn't see a clear answer above. I was having exactly the same problem as you. So in the end, it was an issue on my side, but what help me debug this was to add the actual action code in the method
actionSheet:didDismissWithButtonIndex:
as suggested by Matthew.
This proved that the view was actually dismissed. That's when I realized that I put the UIActionSheet alloc in my viewWillAppear method. So each time the view appears it re-creates the action sheet.
This seems weird as the SDK Documentation states:
actionSheet:clickedButtonAtIndex:
…
The receiver is automatically dismissed after this method is invoked.
I can think of 3 possibilities why it may not disappear:
The main runloop (main thread!) which handles the animations and display stuff is not called. Do you work something heavy in your main thread like synchronous networking calls? (note the word "after" in the SDK text)
Somehow you schedule to show the action sheet multiple times
You display the same view controller instance modally that is already somewhere below the current view on the view stack.
I just wrote a quick sample app to test this out and it worked just as I expected (i.e., I couldn't repro your issue). It was a little different in that I didn't do a TabBar application but I'm still hopeful this helps. What I did with the UIActionSheet was to show it like this: [actionSheet showInView:self.view]. Maybe that will work?
Sorry for the rushed answer, I was on my way out when this caught my eye. :)
I have also faced problems like this with iOS 4.2.
I think you should try with the following steps:
Create a separate method for the code you want to be executed on clicking the actionsheet button. suppose the method is -(void)presentModalView{}
2.Now in the - (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex method,Call the presentModalView{} method for the clicked button index like this:
if(buttonIndex==0)
{
[self performSelector:#selector(presentModalView) withObject:nil afterDelay:0.3];
}
3.You can also try by different delay time.
Hope it helps..
I had the same issue calling MailComposeView from AlertBox/ActionSheet caused the MailCompseView to come behind invisible screen.
I solved it by calling dismissWithClickedButtonIndex:animated: in the actionSheet button handler.
The problem has been resolved in iOS5.
I learned how to create a view controller and make the view slide in from bottom. But the one in iphone album looks different. It darkens the rest of the visible portion of the screen when the view slides in. How do I create a similar one? I want to add buttons like "save, cancel, email" etc into the sliding view.
This actually isn't a typical "sliding" (or modal) view, but a UIActionSheet. Basically, the idea is that you initialize the view (usually in your view controller) with
UIActionSheet *sheet =
[[[UIActionSheet alloc] initWithTitle:#"My sheet"
delegate:self
cancelButtonTitle:#"Cancel"
destructiveButtonTitle:nil
otherButtonTitles:#"Email", #"MMS", nil] autorelease];
Then present it using
[sheet showInView:[self view]];
Once it's onscreen, the delegate (self, or your view controller, in this example) will receive the UIActionSheetDelegate message actionSheet:clickedButtonAtIndex: (as well as some others; see the documentation for more), so you'll want to add <UIActionSheetDelegate> to your interface declaration for the delegate and implement that method, like
- (void)actionSheet:(UIActionSheet *)actionSheet
clickedButtonAtIndex:(NSInteger)buttonIndex {
switch(buttonIndex) {
// Do things based on which button was pushed
}
}