I need help on dismissing a UIAlertView programmatically. Currently I have this
UIAlertView *alert1 = [[UIAlertView alloc]initWithTitle:#"title" message:#"message" delegate:nil cancelButtonTitle:nil otherButtonTitles:nil];
then later on I call this
[alert1 dismissWithClickedButtonIndex:0 animated:NO];
but nothing happens.
You need to set two things.
1. include your .h file : <UIAlertViewDelegate>
2. please follow below implementation...
UIAlertView *alert1 = [[UIAlertView alloc]initWithTitle:#"title" message:#"message" delegate:nil cancelButtonTitle:nil otherButtonTitles:nil];
[alert1 show];
[self performSelector:#selector(dismiss:) withObject:alert1 afterDelay:1.0];
the dismiss method will be...
-(void)dismiss:(UIAlertView*)alert
{
[alert dismissWithClickedButtonIndex:0 animated:YES];
}
I hope this will help you.
I encountered this problem too.
In my case, for some reason calling:
[alert dismissWithClickedButtonIndex:0 animated:NO];
didn't work always (yes, even calling it on UI thread and yes, alert != nil), instead simply setting the animated flag to YES it worked:
[alert dismissWithClickedButtonIndex:0 animated:YES];
Maybe it's an Apple bug...
you should display it first:
UIAlertView *alert1 = [[UIAlertView alloc]initWithTitle:#"title" message:#"message" delegate:self cancelButtonTitle:#"Cancel" otherButtonTitles:nil];
[alert1 show];
then in delegate method
- (void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex{
if(buttonIndex==0){
// do something
}
}
The methods you called is correct.
I guess the alert1 is nil when your call the method dismissWithClickedButtonIndex:animated:
Try to check your variable alert1.
You can use the delegate method -alertView:didDismissWithButtonIndex: instead—it gets called once the alert view’s been removed from the screen, OR better approach is , use a background thread, e.g. with -performSelectorInBackground:withObject:, to handle whatever processing you need to do.
Related
in my Alert View, there is two button, OK and Cancel. When the user click the OK button, the delegate method dismissWithClickedButtonIndex:animated get called, and if the index is 0, then i get called to a method to execute some code:
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Alert"
message:#"Are you sure you want to exit"
delegate:self cancelButtonTitle: #"OK"
otherButtonTitles: #"Cancel",nil];
[alert show];
[alert release];//release the reference
Delegate method:
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex{
if (buttonIndex==0) {
[self aMethod];
}
}
-(void)aMethod{
//Some useful code
}
Now, what i want to instead of all this, is to execute the code of the aMethod method in the AlertView directly, without referring to A delegate method and a method which get called, something like that:
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Alert"
message:#"Are you sure you want to exit"
delegate:self cancelButtonTitle: #"OK" //Put here some useful code
otherButtonTitles: #"Cancel",nil];
Is it possible?
Unfortunately this is not possible at this time (iOS 5.1). The AlertView class does not support blocks.
I made a pair of UIAlertView and UIActionSheet subclasses that do exactly that. Grab them here:
https://github.com/rydermackay/RMActionSheet
Use them like this:
RMAlertView *alertView = [RMAlertView alertViewWithTitle:#"Alert!" message:nil];
[alertView addButtonWithTitle:#"OK"
action:^{
NSLog(#"OK");
}];
[alertView addCancelButtonWithTitle:#"Cancel"
action:nil];
[alertView show];
EDIT:
From your comments it sounds like you're not familiar with blocks. Read this now. Seriously.
http://developer.apple.com/library/ios/#documentation/cocoa/Conceptual/Blocks/Articles/00_Introduction.html
This is a good one too:
http://www.mikeash.com/pyblog/friday-qa-2009-08-14-practical-blocks.html
Hello and good afternoon, I'm having some issues here, and to be honest, I don't understand
I have to create different alertViews for the same screen with different messages, most of these alerts only have 1 button, but there's this one to delete that needs 2 buttons, the thing is that, since the others have only 1 button, when I created the 2 button screenview and I added the (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex method, I have some problems
some code here
- (IBAction)saveInfo{
if (med.text.length ==0) {
UIAlertView *alertViewError = [[UIAlertView alloc] initWithTitle:NSLocalizedString(#"ERROR",#"")
message:NSLocalizedString(#"EMPTY1",#"")
delegate:self
cancelButtonTitle:#"OK"
otherButtonTitles: nil];
[alertViewError show];
[alertViewError release];
}
else if(medicamento.text.length >= 41){
[self lenghtError:40:NSLocalizedString(#"TF_MED",#"")];
}
else if (med.text.length ==0 || descripcion.text.length == 0) {
UIAlertView *alertViewError = [[UIAlertView alloc] initWithTitle:NSLocalizedString(#"ERROR",#"")
message:NSLocalizedString(#"EMPTY2",#"")
delegate:self
cancelButtonTitle:#"OK"
otherButtonTitles: nil];
[alertViewError show];
[alertViewError release];
}
else if (descripcion.text.length >= 41){
[self lenghtError:40:NSLocalizedString(#"TF_DESCRIPCION",#"")];
}
else{
[self insertDictionary];
UIAlertView *alertViewAcept = [[UIAlertView alloc] initWithTitle:#""
message: NSLocalizedString(#"ACCEPT_MSG",#"")
delegate:self
cancelButtonTitle:#"OK"
otherButtonTitles: nil];
[alertViewAcept show];
[alertViewAcept release];
[self.navigationController popViewControllerAnimated:YES];
}
}
- (IBAction)cancelData{
UIAlertView *alertViewCancel =
[[UIAlertView alloc] initWithTitle: NSLocalizedString(#"BT_DELETE_MED",#"")
message: NSLocalizedString(#"MSG_DELETE_MED",#"")
delegate:self
cancelButtonTitle:#"OK"
otherButtonTitles: #"Cancel", nil];
[alertViewCancel setTag:999];
[alertViewCancel show];
[alertViewCancel release];
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (alertView.tag == 999) {
if(buttonIndex==0){
[self.Bayer_DB_obj deleteRowWithKeyValue:[NSString stringWithFormat:#"%d",IdMed] onKeyName:#"id_ctl_med" onTable:#"ctl_med"];
// code to delete here
[self.navigationController popViewControllerAnimated:YES];
}
}
}
So, in the first part, I created some alerts to indicate the user that he/she is making a mistake, in the second part, I need a confirmation before deletion, but here, I need 2 buttons, then, in the 3rd part, I have the method that is been called, I added a tag to my alert to avoid doing this comparison in all the alerts, the problem is that, when you show alertViewAcept, it takes you to the previous view controller, and after you click the ok button (that actually is the cancelbuttontitle) the app crashes without any "error message"
so I'm not sure what I'm doing wrong, please help
My guess the problem is that you set the delegate for the alertViewAcept, and right after you showed the alert, you pop the viewController and so your delegate will get released, which will then give you an error once a button on the alert view is clicked.
You should do this:
UIAlertView *alertViewAcept = [[UIAlertView alloc] initWithTitle:#""
message: NSLocalizedString(#"ACCEPT_MSG",#"")
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles: nil];
Even better, all your alerts which only have the OK button, do not need a delegate. And in that case you do not even need the tag.
i have a project with many vie controller, in one of these i create and show a view alert. it's possible show alert in every view exclude one?
I need this because if you are in the alarm view controller you don't need to see the alert when alarm ring
i try this but not works!
// ALERT NOTIFICATION
if (!self.timerViewController) {
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:#"Piccole Ricette" message:#"READY" delegate:self cancelButtonTitle:#"OK" otherButtonTitles: nil];
[alertView show];
[alertView release];
}
In iOS you can test whether a ViewController 's view is visible by testing the view's window property. If the view is not visible the window property will be nil. So perhaps you can do something like this:
if (!self.timerViewController.view.window) {
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:#"Piccole Ricette" message:#"READY" delegate:self cancelButtonTitle:#"OK" otherButtonTitles: nil];
[alertView show];
[alertView release];
}
Is it possible to do something like what is shown below using an Alert with a UITableView? If so, how can it be done?
read my this post - http://www.makebetterthings.com/blogs/iphone/add-uitextfield-in-uialertview/
and try to add a table or scroll view instead of uitextfield
No, that's not a UITableView. If you want to show something like that, use UIAlertView:
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:#"Annuler" delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil]; [alert show]; [alert release];
In my appln I m using multiple UIAlertView and to determine which between was clicked in alertview i use the method
- (void) alertView:(UIAlertView *)alert clickedButtonAtIndex:(NSInteger)buttonIndex{
}
but i need only for the one alertview but it was responding for all alertviews. how to restrict to only to one alertview or to alertview to which i need determine the button action
Common practice is to use a unique number for the tag property of each UIAlertView, and then check the tag in your delegate callbacks. An easy way to do this is with an enum:
enum {
kServiceErrorAlert = 1,
kFailedToSaveAlert = 2
};
...
alertView.tag = kServiceErrorAlert;
[alertView show];
If you can afford to run on 4.x only, you can use blocks and forget about delegates and tags:
LambdaAlert *alert = [[LambdaAlert alloc]
initWithTitle:#"Test Alert"
message:#"See if the thing works."];
[alert addButtonWithTitle:#"Foo" block:^{ NSLog(#"Foo"); }];
[alert addButtonWithTitle:#"Bar" block:^{ NSLog(#"Bar"); }];
[alert addButtonWithTitle:#"Cancel" block:NULL];
[alert show];
[alert release];
See LambdaAlert on GitHub.