I have a UISwitch object in my .xib file. Its state is On by default. If the user switches it to Off, I want to ask if he's sure, and if he clicks No - automatically switch it back to On.
So I set these outlet and action in my .h file:
#property (weak, nonatomic) IBOutlet UISwitch *campaignSwitch;
- (IBAction)checkCampaignSwitch:(id)sender;
This is the checkCampaignSwitch method:
- (IBAction)checkCampaignSwitch:(id)sender {
if(self.campaignSwitch.isOn==FALSE)
{
[self allertMessage:#"Receive updates" :#"Are you sure you don't want
to receive updates?" :#"No" :#"Yes"];
}
}
This calls for method to display an Alert message with various parameters (title, text, cancel button and other button).
I also registered for UIAlertViewDelegate and in my .m file I'm trying to implement the clickedButtonAtIndex method like this:
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
switch (buttonIndex) {
case 0:
[self.campaignSwitch setOn:TRUE];
break;
default:
break;
}
}
I'm getting the Alert message, but nothing happens when I click the No button. Nor the Yes.
So how do I switch it back On?
Make sure you have all connections connected in Interface Builder. Also, make sure your switch statement in your alert view is associated with the right button (i.e. make sure you getting to case 0).
To turn a switch off, see the code below.
// Set the switch on
[_switch setOn:YES];
// Set the switch off
[_switch SetOn:NO];
I usually do it like this in order for it to be drawn immediately:
[emailAlertSwitch setOn:NO animated:YES];
OR
[emailAlertSwitch setOn:YES animated:YES];
Is it entering the alertView delegate callback?
You need to use the setOn: animated: method
[self.campaignSwitch setOn:YES animated:YES];
Simply using setOn without animated will not show an animation.
Had to make sure the UIAlertView is delegated:
UIAlertView *displayMessage = [[UIAlertView alloc]
initWithTitle:messageTitle
message:alertMessage
**delegate:self**
cancelButtonTitle:cancelButton
otherButtonTitles:otherButton,
nil];
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];
}
}
}
When popping a view I want to save some data, by asking confirmation. I'm asking confirmation using UIActionSheet. But irrespective of my response in action sheet, the view is changing in background, it creates some problem for me to use the response. I'm using navigation controller to switch views. How can I solve this
TIA
Better option is to use uialertview for asking confirmation.To do this follow this step:
Insure your header file contains the following:
#interface YourViewController : UIViewController <UIAlertViewDelegate>
Now when asked confirmation add this code:
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Message" message:#"Are You Sure" delegate:self cancelButtonTitle:#"YES" otherButtonTitles:#"NO", nil];
[alert show];
[alert release];
Now after pressing one button below delegate will be called so add in .m file of app
- (void)alertView:(UIAlertView *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
// the user clicked one of the YES/NO buttons
if (buttonIndex == 0)
{
NSLog(#"NO button pressed");
}
else
{
//Save data here
NSLog(#"YES button pressed");
}
}
#PooLas If I understood you correctly, You use uiactionsheet for user confirmation, while in background (actually under actionsheet) you change view controllers. Well, you can't do that, because delegate must be attached to controller which shows it up (if i am wrong, correct me). So when you click button, you can only first dismiss actionsheet and then change view controller, but not opposite – PooLaS
I have searched and searched the board(s) and am not able to figure this out. It has got to be something simple and right in front of me.
I am trying clean up my code and make it more reusable. I was taking some UIActionSheet code that works from a UIViewController and making its own object file. Works fine, until I add UIActionSheetDelegate methods.
When a button is pressed, instead of firing the actionSheetCancel method, it crashes with no stack trace. Every time.
My code is below. Any help would be appreciated. My guess has been it is because I am not using the xcode storyboard tool to connect things together, but I would think this is legal.
egcTestSheet.h:
#import <UIKit/UIKit.h>
#interface egcTestSheet : NSObject <UIActionSheetDelegate> {
}
- (void) showSheet:(UITabBar *) tabBar
displayTitle:(NSString *) name;
#end
egcTestSheet.m
#import "egcTestSheet.h"
#implementation egcTestSheet
-(void) showSheet:(UITabBar *)tabBar displayTitle:(NSString *)name{
UIActionSheet *menu = [[UIActionSheet alloc] initWithTitle:name
delegate:self
cancelButtonTitle:#"Done"
destructiveButtonTitle:#"Cancel"otherButtonTitles:nil];
[menu showFromTabBar:tabBar];
[menu setBounds:CGRectMake(0,0,320, 700)];
}
// actionsheet delegate protocol item
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex: (NSInteger)buttonIndex{
NSLog(#"button index = %d", buttonIndex);
}
- (void)actionSheetCancel:(UIActionSheet *)actionSheet{
NSLog(#"in action canceled method");
}
#end
call code from a UIViewController object:
egcTestSheet *sheet = [[egcTestSheet alloc] init];
[sheet showSheet:self.tabBarController.tabBar displayTitle:#"new test"];
Your action sheet is probably being released as it is dismissed (are you using ARC?). This means when it tries to call it's delegate to inform said delegate of its dismissal/selection, it is trying to call self. Self is a dangling pointer by this time, because it has been released.
In the view controller that is presenting/calling this action sheet, set a property to keep a reference to the action sheet. Set the property to nil on dismissal of the action sheet.
I'm having some trouble with either a UIAlertView or UIActionSheet stealing the focus and not letting go.
To elaborate, I have a setup whereby a user presses a button. This then displays a UIAlertView with a UITextField. When the user presses the 'Ok' button a UIActionSheet is displayed (called from the UIAlertView delegate method) confirming something with the user. However when they press one of the buttons the UIActionSheet goes away but the focus doesn't get returned to the main view.
I have been playing around and whatever I seem to do I always end up with my main UIView being covered with a layer like this (obviously you can seem my view through the layer). I have tried removing all subviews of the view but it didn't have any success.
Please can someone help me out?
Here is the source code:
// This method displays the UIAlertView which contains a UITextView linked up to a
// UIPickerView.
- (IBAction)buttonPressed:(id)sender
{
UIAlertView *deleteAlert = [[UIAlertView alloc] initWithTitle:#"Delete Something"
message:#"Select something to delete:"
delegate:self
cancelButtonTitle:#"Cancel"
otherButtonTitles:#"Ok", nil];
deleteAlert.alertViewStyle = UIAlertViewStylePlainTextInput;
deleteAlert.tag = kDeleteAlert;
deleteTextField = [deleteAlert textFieldAtIndex:0];
[pickerView reloadAllComponents];
deleteTextField.inputView = pickerView;
[deleteAlert show];
}
// The UIAlertView delegate method is then used to display a UIActionSheet to confirm
// whether the user wants to proceed.
- (void) alertView:(UIAlertView *)alert clickedButtonAtIndex:(NSInteger)buttonIndex
{
UIActionSheet *confirmDelete = [[UIActionSheet alloc] initWithTitle:#"Delete blah?"
delegate:self
cancelButtonTitle:#"No"
destructiveButtonTitle:#"Yes"
otherButtonTitles:nil];
confirmDelete.actionSheetStyle = UIActionSheetStyleBlackOpaque;
[confirmDelete showInView:self.parentViewController.tabBarController.view];
}
// Then the focus should be returned to the original view (i.e. where the first button
// was pressed to launch the UIAlertView. However the focus is still locked and the
// view appears slightly dimmed around the edges.
-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex == actionSheet.destructiveButtonIndex)
{
// Do some stuff ...
}
}
I think your issue is a result of the deleteAlert alert view not being dismissed when the actionSheet is called.
I sounds to me like the alert view still has focus but is in an unknown state, because it hasn't been dismissed, but you have done something with it's button press.
Presumably, you want to dismiss the alert view when the action sheet is presented? Then when the action sheet is dismissed, you get back to your main view? So, the order you want:
1) Present alert view
2) If a button on the alert view is pressed, it notifies it's delegate using - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
3) Dismiss the alertView - (void)dismissWithClickedButtonIndex:(NSInteger)buttonIndex animated:(BOOL)animated and present the action sheet.
3) When the action sheet is used, it calls it's delegate method - (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex and within that method, dismiss it, or whatever else you need to do.
You would put all of these delegate methods in your original calling viewcontroller, conforming it to <UIAlertViewDelegate, UIActionSheetDelegate>.
You will need to make the original viewcontroller the delegate of the alert view AND the action sheet when you create them. I hope this makes sense.
More information http://developer.apple.com/library/ios/#documentation/uikit/reference/UIAlertView_Class/UIAlertView/UIAlertView.html
I would say it's probably b/c you are not resigning the first responder on the UITextField that is inside the UIAlertView. Make sure that before you show your UIActionSheet you do
[myTextField resignFirstResponder];
I have such error: when I click navigationbar.backItemButton I'm showing UIAlertView with two buttons. When I press on any of them application terminates just with EXC_BAD_ACCESS. Method - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex don't called. How can I solve it? Thanx!
//h - file
#interface DetailsTableViewController : UITableViewController <UITextFieldDelegate, UIAlertViewDelegate>
//m - file
- (void)viewWillDisappear:(BOOL)animated
{
//if changes unsaved - alert reask window
if (isDirty)
{
UIAlertView *message = [[UIAlertView alloc] initWithTitle:#"Save changes?"
message:#"Press YES if you want to save changes before exit, NO - other case."
delegate: self
cancelButtonTitle: #"NO"
otherButtonTitles: #"YES", nil];
[message show];
[message autorelease];
}
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
NSString *title = [alertView buttonTitleAtIndex: buttonIndex];
if([title isEqualToString: #"YES"])
{
[self saveBtnUserClick];
}
}
I think the problem is that after you tapped back button your current controller is removed from navigation stack and deallocated, so when alert tries to call its delegate methods it calls them on deallocated object which results in EXC_BAD_ACCESS error. To workaround the problem I see 2 obvious options (although there may be better solutions):
Extra retain your controller somewhere (in previous controller may be), but you need to find way to release it when you're done.
Create your custom button instead of standard "back" and just show alert when it tapped. Then in alert's delegate method pop your current controller from navigation stack.
Try Changing delegate to nil instead of self. It fixed my issue.
Is your view controller implementing the UIAlertViewDelegate? If not, add in you interface declaration before the { starts.
Also try NSLogging inside the clickedButtonAtIndex method and print the buttonIndex values and see the console.
Edit: Reading your post again, I guess you indeed have missed the UIAlertViewDelegate in your interface declaration.
Probably [message autorelease];
is you mistake use
[message release];
Because you have used [[UIAlertView alloc] init.....]; there for you should release the memory.
autorelease is something will work with the structure which memory is compiler dependent or you have not given the memory manually.
Enjoy.
"Try Changing delegate to nil instead of self. It fixed my issue." worked for me. Thanx