I have a button in a menu which when touched, pops up a alert message with two buttons: "Cancel" and "Yes". This is the code I have for the alert:
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Exit game"
message:#"Are you sure?"
delegate:nil
cancelButtonTitle:#"Cancel"
otherButtonTitles:#"Yes", nil];
[alert show];
Is it possible to add an action to the button "Yes"?
In your code set the UIAlertView delegate:
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Exit game" message:#"Are you sure?" delegate:self cancelButtonTitle:#"Cancel" otherButtonTitles:#"Yes", nil]; [alert show];
As you have set delegate to self, write the delegate function in the same class as shown below:
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
if (buttonIndex == 1) { // Set buttonIndex == 0 to handel "Ok"/"Yes" button response
// Cancel button response
}}
You need to implement the UIAlertViewDelegate
and add the following...
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
if (buttonIndex == 1) {
// do stuff
}
}
Yes it is easy. See that argument called "delegate" that you have set to nil right now? Set that to an object... usually "self" if you are calling it from your view controller and then implement the selector for UIAlertViewDelegate.
You also need to declare that your view controller conforms to the UIAlertViewDelegate protocol. A good place to do this is in the "private" continuation class of the view controller.
#interface MyViewController() <UIAlertViewDelegate>
#end
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
NSLog(#"Button pushed: %d", buttonIndex);
}
Related
I have a UIAlertView that I implemented in viewDidLoad. I'm trying to make the alertView stay when the otherButton (buttonAtIndex:1) was selected. Here is my code:
UIAlertView *dialog = [[UIAlertView alloc] initWithTitle:#"Title"
message:#"Message:"
delegate:self cancelButtonTitle:#"Cancel"
otherButtonTitles:#"Done", nil];
[dialog setAlertViewStyle:UIAlertViewStylePlainTextInput];
[dialog show];
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 1) return;
[alertView dismissWithClickedButtonIndex:buttonIndex animated:YES];
}
When the second button was selected ("Done"), the alertView goes away. How can I make it stay?
You should create your own alert view class that is NOT a subclass of UIAlertView. UIAlertView's documentation, it says under 'Subclassing notes:
The UIAlertView class is intended to be used as-is and does not support subclassing. (...)
Above referenced in UIAlertView Apple Documentation section marked Subclassing Notes
You might have what you want here :
Subclass UIAlertView and then overload
-dismissWithClickedButtonIndex:animated:, e.g.
#implementation MyAlertView
-(void)dismissWithClickedButtonIndex:(NSInteger)buttonIndex animated:(BOOL)animated {
if (buttonIndex should not dismiss the alert)
return;
[super dismissWithClickedButtonIndex:buttonIndex animated:animated];
}
#end
hi there when i run my delegate method which is parsing json data the alert view appears to freeze whilst it is performing the method is there anyway to hide the alert view whilst the app is running the code I've tried
- (IBAction)btnAdd:(id)sender {
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:#"Add Source" message:#"Enter the web address of the json data" delegate:self cancelButtonTitle:#"Cancel" otherButtonTitles:#"Add", nil];
alert.alertViewStyle = UIAlertViewStylePlainTextInput;
[alert setTag:0];
[alert dismissWithClickedButtonIndex:-1 animated:YES];
[alert show];
}
this doesn't actually do anything.
any advice?
*UPDATE
in the delegate method i get the same result
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
if (alertView.tag == 0) {
if (buttonIndex == 1) {
NSString *textEnteredraw = [[alertView textFieldAtIndex:0] text];
[alertView dismissWithClickedButtonIndex:-1 animated:YES];
From method
- (IBAction)btnAdd:(id)sender
Remove
[alert dismissWithClickedButtonIndex:-1 animated:YES];
Because as #Dima said, you are dismissing the alertView before you are even showing it.
You call the code to hide the alert before you even show it. This method is meant to be called after the alert is shown.
I'm working on a losing screen and I'd like to let users view their game before showing the stats screen. I've decided to use an alert to show users the current screen. After they hit OK, they should be taken to the stats screen.
The problem is, the stat screen pops up at the same time as the alert. How can I make sure the stats screen opens after the user closes the alert?
if ([self.model userHasLost]) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Sorry!" message:#"You lost..." delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alert show];
[self _showGameEndScreenWitnWin:NO]; //Stats screen should open after alert is closed
}
You need to use delegate method of UIAlertView and also need to set delegate of UIAlertView = self,
Following is delegate method
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
check buttonIndex in this method it's give you NSInteger and manage click of button.
For more information read this UIAlertView Delegates.
You need to set the alert view delegate. In this example self will conform to the UIAlertViewDelegate protocol.
if ([self.model userHasLost]) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Sorry!" message:#"You lost..." delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
alert.delegate = self;
[alert show];
}
You can then listen to a delegate method for when the alert view is dismissed :
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
[self _showGameEndScreenWitnWin:NO]; //Stats screen should open after alert is closed
}
For this situation need to use delegate method,
For simple Example Refer Here: http://www.idev101.com/code/User_Interface/UIAlertView.html
I'm hoping someone can help me figure this out...I'm a beginner Xcode / Objective-C programmer. I'm working on a app that is a continuation of last semester.
1: So I created a button and I need it to execute this custom function:
- (void)cancelTapped {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Notification" message:#"Do you want to delete everything and go back to product selection?" delegate:self cancelButtonTitle:#"No" otherButtonTitles:#"Yes"];
[alert setTag:1];
[alert show];
}
How/where do I put this function? Is it in the button properties? Or would I write this in a custom class/controller and link it to it?
2: How do I get it to listen for the alert to return on: - alertView:didDismissWithButtonIndex:
3: From there, how would I would write the logic to hide the page and pop the view?
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
if (alertView.tag == 1 && buttonIndex == 1) {
// Delete data and return to lobby
[self.navigationController popViewControllerAnimated:YES];
}
}
You will need a custom UIViewController to house the logic for your button and alert view interactions. I am assuming you know how to do that.
Once done, assuming you have a reference to your button property in your view controller, you can programatically add a target to your button and pass the selector cancelTapped as a parameter:
[myButton addTarget:self action:#selector(cancelTapped) forControlEvents:UIControlEventTouchUpInside];
Alternatively you could control-drag from the button in your Storyboard to the header file of your custom UIViewController, and define an IBAction. That will create an empty cancelTapped method in your implementation which you could then add your logic in.
As for listening on UIAlertView messages, you will need to make your custom UIViewController a delegate of the UIAlertView by passing "self" as the delegate in the following statement:
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Notification" message:#"My Message" delegate:self cancelButtonTitle:#"No" otherButtonTitles:#"Yes"];
Your CustomViewController should also be declared as a UIAlertViewDelegate.
CustomViewController.h
#interface CustomViewController : UIViewController<UIAlertViewDelegate>
#end
Hope this helps!
By the using VIewWillDisappear method to detect the press of The back button of NavigationItem:
-(void) viewWillDisappear:(BOOL)animated {
if ([self.navigationController.viewControllers indexOfObject:self]==NSNotFound) {
// Navigation button was pressed. Do some stuff
[self cancelTapped];
}
[super viewWillDisappear:animated];
}
- (void)cancelTapped {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Notification" message:#"Do you want to delete everything and go back to product selection?" delegate:self cancelButtonTitle:#"No" otherButtonTitles:#"Yes"];
[alert setTag:1];
[alert show];
}
For More info && also Custom UIBArButtonItem Check Here
In my UIAlertView, I want to open another UIView when "OK" button is pressed.
But the problem is, even after the UIView is displayed, alert remains in screen and once it fades away, the UIView seems to be disabled.
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Add details" message:#" Do you like to set the details now?" delegate:self cancelButtonTitle:#"Yes" otherButtonTitles:#"No",nil];
[alert show];
[alert release];
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{ // the user clicked one of the OK/Cancel buttons
NSString *title = [alertView title];
if([title isEqualToString:#"Add details"])
{
.......
Any help would be appreciated!
Why not check for the button pressed in the delegate method instead of the title?
That is, in
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 0){
// User pressed "YES"
}else{
// User pressed "NO"
}
}
The cancel button has index 0 and the other buttons increase in index. In order to detect which alert was this, you should also give it a tag. Hope this helps.
Could be because the new view is added before the alert view is actually dismissed. So better use the didDismissWithButtonIndex delegate to show a new view on button click event of an existing alert view, instead of clickedButtonAtIndex
- (void) alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
//Add the view
}
Instead of
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
//Add the view
}