- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
....
}
I'm developing iphone app by Xcode.
When i click the button of UIAlertView, I have to modify some local variables in that method.
I want to control some local variables in that method.
So is there the way to pass the variables as parameter ?
No you cannot pass anything else to that method, but if you are going to modify local variables then what is the point?, if you want to use some information on that method you will have to set that information in an instance variable.
So for example before showing your AlertView something like this:
self.myInstanceVariable = valueIWillNeedWhenClicked;
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:#"Title" message:#"Message" delegate:self cancelButtonTitle:#"NO" otherButtonTitles:#"YES", nil];
alertView.delegate = self;
[alertView show];
[alertView release];
Then on method:
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
NSString *valueINeed = self.myInstanceVariable
}
Related
Why doesn't this code work? All I have is this:
-(void)_webview:(UIWebView *)_webview didFailLoadWithError:(NSError *)error {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Error!" message:#"You have no internet connection!" delegate:self cancelButtonTitle:#"Close" otherButtonTitles:nil, nil];
[alert show];
}
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
exit(0);
}
It should work, right?
Because you mistyped the name of the UIWebViewDelegate method. You have
_webview:didFailLoadWithError:
whereas the real name of this method is
webView:didFailLoadWithError:
The delegate method is mistyped, as stated in the above response. Also, did you set the delegate of the UIWebView to the instance of the class that has those methods implemented?
for example, if it's a view controller, it could be in viewDidLoad:
- (void)viewDidLoad
{
[super viewDidLoad];
_webView.delegate = self;
}
I have a very simple process running where after each round of a simple game the scores are calculated, labels updated and all the normal, very simple stuff. I have a UIAlertView that informs the player of how s/he performed. I use a UIAlertViewDelegate to postpone all the updates, resetting of controls etc. till after the UIAlertView is dismissed. The methods are [startNewRound],[startOver] and [updateLabels]. It's fairly obvious what they all do. Anyway, when the user hits round ten, I've made another UIAlertView that informs the player that the game has ended and shows the overall score. Again, I hoped to use a delegate to postpone the resets till after the AlertView is dismissed. The only problem is, with the endGame AlertView, it seems to be using the first AlertView's delegate method causing the game to continue with a new round and not start from the beginning. I hope this makes sense. Anyway, here are snippets of my code.
if (round == 10){
UIAlertView *endGame = [[UIAlertView alloc]
initWithTitle: #"End of Game"
message: endMessage
delegate:self
cancelButtonTitle:#"New Game"
otherButtonTitles:nil];
[endGame show];
}
else {
UIAlertView *alertView = [[UIAlertView alloc]
initWithTitle: title
message: message
delegate:self
cancelButtonTitle:#"Next"
otherButtonTitles:nil];
[alertView show];
}
And then the delegate methods:
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
[self startNewRound];
[self updateLabels];
}
- (void)endGame:(UIAlertView *)endGame didDismissWithButtonIndex:(NSInteger)buttonIndex
{
[self startOver];
}
So there it is. As I mentioned, the endGame AlertView appears to be using alertView's delegate, thus not activating the [self startOver] method. All the methods are working, it's just the AlertView is using the incorrect delegate method. Regards, Mike
Change your code like this,
if (round == 10){
UIAlertView *endGame = [[UIAlertView alloc]
initWithTitle: #"End of Game"
message: endMessage
delegate:self
cancelButtonTitle:#"New Game"
otherButtonTitles:nil];
endGame.tag = 111;
[endGame show];
}
else {
UIAlertView *alertView = [[UIAlertView alloc]
initWithTitle: title
message: message
delegate:self
cancelButtonTitle:#"Next"
otherButtonTitles:nil];
alertView.tag = 222;
[alertView show];
}
and delegate method as,
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
if(alertView.tag == 111)
{
[self startNewRound];
[self updateLabels];
}
else if(alertView.tag == 222)
{
[self startOver];
}
}
You cant have two delegate method for dismisswithbuttonindex, you need to handle this situation with tag.
Give both alert view a different tag and check it on delegate object. Thus you can differentiat the both alert view.
In my program, I have a code as below. How to exit the program after DETECTING user click OK on the UIAlertView?
Thanks
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"YOur Message" message:#"Your description"
delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil, nil];
[alert show];
[alert release];
For getting the cancel (your "OK") button Implement this method:
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
if(buttonIndex == 0)
exit(0);
}
Check the QA here.
see this tutorial
if You want then use exit(0);
set AlertView delegate to self. and do your task in following delegate-
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
For capturing the ok pressed, use this:
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
exit(0);
}
I am calling UIAlert with 2 buttons "Cancel" and "OK" in MyapplicationAppDelegate.m file , the alert is called but on tap of "Cancel" or "OK" button
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
method is not called.
I have added UIAlertViewDelegate in the MyapplicationAppDelegate.h file as below
#import UIKit/UIKit.h
#interface MyapplicationAppDelegate: NSObject UIApplicationDelegate,UIAlertViewDelegate
{
..
}
I want to know what else is required.
I am not sure whether its your typo while posting the question but you should call the delegate within <.. , .. >
#interface MyapplicationAppDelegate: NSObject <UIApplicationDelegate,UIAlertViewDelegate> { .. }
Here is sample code for UIAlertView
UIAlertView *myAlertView = [[UIAlertView alloc]initWithTitle:#""message:#"Your message goes here" delegate:self cancelButtonTitle:#"OK"otherButtonTitles:nil];
[myAlertView show];
[myAlertView release];
I am not sure myAlertView.delgate = self is the right method but i do set delegate with initWithTitle
For me,
#define appDelegate ((AppDelegate*)[UIApplication sharedApplication].delegate)
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:nil
message:#"Say Yes or NO?" delegate:appDelegate
cancelButtonTitle:#"No" otherButtonTitles:#"Yes", nil];
alertView.tag = 1;
[alertView show];
[alertView release];
do the trick!
Now its going into, -(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex; in AppDelegate file without adding,
#interface MyapplicationAppDelegate: NSObject <UIApplicationDelegate,UIAlertViewDelegate> { .. }
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.