I want to show a box and proceed with my code based on user's input. UIAlertView does not work as the application does not wait for the input. So is there another type of widget that can wait for user input and then pass control to the app ?
I know there are duplicates here but they are not very helpful as I seem to be missing some pieces (completely new to objective c...)
-(void)function1{
...
// Add UIAlertView *alert; to .h file
alert = [[UIAlertView alloc] initWithTitle:#"" message:#"" delegate:self cancelButtonTitle:#"No" otherButtonTitles:#"Yes", nil];
[alert show];
}
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
if(alertView == alert && buttonIndex == 1){ // If yes
[self function2];
}
}
-(void)function2{
...
//Continue your task
}
you want a MODAL alert -- just use a UIAlertView and wait for its delegate before proceeding.
- a {
alert.delegate = self;
[alert show];
}
-alertView:(id)a didDismissWithButtonIndex:(int)i {
[self proceed];
}
- proceed {
... after alert ...
}
hi guys I have a method called manageui which display a waiting view for a while and when the times out it's display UIAlertView which display a message for try again
My problem is that i can't hide the UIAlertView before calling manageui called
here is my code :
-(void)mangeui
{
double Currenttime=0;
double ptime=Currenttime+5000;
NSLog(#"fire /n");
do
{
//add condition for found session
if (Currenttime<ptime)
{
NSLog(#"inside if");
[spinner setHidden:NO];
[alert setHidden:YES];
}
else
{
alert = [[UIAlertView alloc] initWithTitle:#"Oops:("
message:#"No device found \n Make sure bluetooth is activated and the devices are within range."
delegate:self
cancelButtonTitle:#"Tap to retry"
otherButtonTitles:nil];
[spinner setHidden:YES];
[alert show];
}
Currenttime+=1;
} while (Currenttime < ptime+1 &&[_matchmakingClient availableServerCount]==0);
}
the delegate for alertview is :
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
[alertView dismissWithClickedButtonIndex:1 animated:true];
[spinner setHidden:NO];
alertView.hidden=YES;
[self mangeui];
}
Try this:
[alertView dismissWithClickedButtonIndex:0 animated:YES];
Well I think you didn't understand the concept of delegates
here in docs it says alertView:clickedButtonAtIndex:
The receiver is automatically dismissed after this method is invoked.
yeah there is no need to declare separately to dismiss the alert view.The method is called whenever a button in alertview is pressed and the alertview disappears
I am having problem with AlertView. I am trying to use the UIAlertView and after click ok it will return back to the previous screen but it do not seems to work any advice ?
if (xGPSCoordinate==0 && yGPSCoordinate == 0) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Title"
message:#"Failed to load the to get your current location"
delegate:self
cancelButtonTitle:#"Ok"
otherButtonTitles:nil, nil];
[alert show];
[alert release];
return;
[self.navigationController popViewControllerAnimated:YES];
}
or
if (xGPSCoordinate==0 && yGPSCoordinate == 0) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"iPoly"
message:#"Failed to load the to get your current location"
delegate:self
cancelButtonTitle:#"Ok"
otherButtonTitles:nil, nil];
[alert show];
[alert release];
[self.navigationController popViewControllerAnimated:YES];
return;
}
both doesn't work
For this purpose you've to use UIAlertView's delegate method.
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex;
First use this in your #interface <UIAlertViewDelegate>
Then set the delegate, self.yourAlertView.delegate=self;
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if(buttonIndex==0)//first button which should be the OK button
{
[self.navigationController popViewControllerAnimated:YES];
}
}
use the delegate method of UIAlertView, see the answer given by iNoob. It does not make a sense if you write anything after the "return;" statement as the code below "return;" statement will never get executed.
refer apple developer link for more details on UIAlertView delegate http://developer.apple.com/library/ios/#DOCUMENTATION/UIKit/Reference/UIAlertViewDelegate_Protocol/UIAlertViewDelegate/UIAlertViewDelegate.html
or a simple tutorial on alert view
http://mobile.tutsplus.com/tutorials/iphone/uialertview/
You just need to implement UIAlerView Delegate Methods.
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{}
write your code for Pop to previous Controller here.You can the clicked button index and on the basis of that you can use.Don't for Conform UIAlertViewDelegate to Interface.
Say I have a alert view like follows in obj c
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:#"title" message:#"szMsg" delegate:nil cancelButtonTitle:#"Ok" otherButtonTitles:#"download"];
[alert show];
[alert release];
Now we have 2 buttons on the alert view (Ok & Download), how to write an event handler for the Download one?
First you will need to add the UIAlertViewDelegate to your header file like below:
Header file (.h)
#interface YourViewController : UIViewController<UIAlertViewDelegate>
Implementation File (.m)
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:#"title" message:#"szMsg" delegate:self cancelButtonTitle:#"Ok" otherButtonTitles:#"download"];
[alert show];
[alert release];
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 0)
{
//Code for OK button
}
if (buttonIndex == 1)
{
//Code for download button
}
}
Now that most iOS devices have firmare versions with blocks support it’s an anachronism to use the clumsy callback API to handle button presses. Blocks are the way to go, see for example the Lambda Alert classes on GitHub:
CCAlertView *alert = [[CCAlertView 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];
Declare your UIAlertViews as known.
UIAlertView *alertLogout=[[UIAlertView alloc]initWithTitle:#"Title" message:#"Stop Application?" delegate:self cancelButtonTitle:#"No" otherButtonTitles:#"Yes",nil];
[alertLogout show];
[alertLogout release];
set delegate to self and implement this method.
-(void)alertView:(UIAlertView *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
if(actionSheet== alertLogout) {//alertLogout
if (buttonIndex == 0){
}else if(buttonIndex==1){
}
}else if (actionSheet==alertComment) {//alertComment
if (buttonIndex==0) {
}
}
}
Stack's and Guillermo Ortega's answer is probably what you would use with a couple of UIAlertView but not for ten. I use to use BlocksKit which is kind of the same as Lambda stuff which is what soul suggested. That is a good option too, although if you have too many nested blocks you will start seeing the demerits of it (Aside from the fact you will be relying in another library).
The usual way of handling several stuff would be to have a handler object. (
#interface MyAlertViewDelegate : NSObject <UIAlertViewDelegate> #end) make that object the delegate of the alert view and make sure the object is alive at least until the alert view is dismissed.
This will certainly work, but could be too much work...
What follows is what I came up with; IMO it is simpler and there is no need of any thirdParty library, or an ivar per UIAlertView. Just one extra object (#property (nonatomic, strong) NSArray *modalActions) to store the actions the current UIAlertView will cause to perform
Showing an UIAlertView and reacting accordingly
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:alertTitle
message:#"Blah blah"
delegate:self
cancelButtonTitle:#"Cancel"
otherButtonTitles:b1, b2, b3, nil];
// Add one selector/action per button at the proper index
self.modalActions = #[
[NSNull null], // Because indexes of UIAlertView buttons start at 1
NSStringFromSelector(#selector(actionForAlertViewButton1)),
NSStringFromSelector(#selector(actionForAlertViewButton2)),
NSStringFromSelector(#selector(actionForAlertViewButton3))];
[alertView show];
The delegate method:
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
if (alertView.cancelButtonIndex != buttonIndex) {
[self performModalActionAtIndex:buttonIndex];
}
}
The part that actually performs the action:
- (void)performModalActionAtIndex:(NSInteger)index
{
if (-1 < index && index < self.modalActions.count &&
[self.modalActions[index] isKindOfClass:[NSString class]]) {
SEL action = NSSelectorFromString(self.modalActions[index]);
NSLog(#"action: %#", self.modalActions[index]);
if ([self respondsToSelector:action]) {
// There is a situation with performSelector: in ARC.
// http://stackoverflow.com/questions/7017281/
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
[self performSelector:action];
#pragma clang diagnostic pop
}
self.modalActions = nil;
}
Reusable for UIActionSheets too
UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:title
delegate:self
cancelButtonTitle:cancelButton
destructiveButtonTitle:nil
otherButtonTitles:button1, button2, button3, nil];
// Similarly, add one action per button at the proper index
self.modalActions = #[
NSStringFromSelector(#selector(actionForActionSheetButton1)),
NSStringFromSelector(#selector(actionForActionSheetButton2)),
NSStringFromSelector(#selector(actionForActionSheetButton3))];
The delegate method:
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (actionSheet.cancelButtonIndex != buttonIndex) {
[self performModalActionAtIndex:buttonIndex];
}
}
Why this works:
This works because of two reasons:
First, I never present two UIAlertView that have a delegate at the same time. (IMO you should't, it doesn't look good). Second, because in my case (as 90% of the cases) the target of the actions is always the same object (in this case: self). Even if you don't meet above conditions you can even use this approach with some modifications:
If you show two or more UIAlerViews or UIActionSheets at the same time (possible in the iPad) Use a dictionary with to store one array of actions associated with a certain UIAlertView/UIActionSheet.
If the target of the actions is not self, they you need to store pairs (target and the action) in the array. (Something to simulate UIButtons addTarget:action:...).
In either case, for storing the target and/or UIActionSheet/UIAlertView [NSValue valueWithNonretainedObject:] should become handy :)
First of all you declare UIAlertViewDelegate in .h file after put below code in .m file
- (void)alertView:(UIAlertView *)alert clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 1)
{
//put button action which you want.
}
}
Implement the UIAlertViewDelegate and make use of the delegate method
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
if(buttonIndex == 0) {
// Do something
}
else {
// Do something
}
}
UIAlertView *alertView=[[UIAlertView alloc]initWithTitle:#"Data Saved" message:#"Choose more photos" delegate:self cancelButtonTitle:#"OK" otherButtonTitles:Nil];
[alertView show];
[alertView release];
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
if(buttonIndex==0)
{
[self dismissModalViewControllerAnimated:YES];
}
}
in swift:
we can use this little block of code
let alert = UIAlertController(title: "Alert", message: "This is an alert message", preferredStyle: UIAlertControllerStyle.Alert)
let action = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: {(action:UIAlertAction) in print("This is in alert block")
})
alert.addAction(action)
self.presentViewController(alert, animated: true, completion: nil)
I wanted to know whether the following code is okay or not. I am trying to dismiss the alertView automatically after 2 seconds (and without any buttons in the alertView) from the "timedAlert" method.
//this is in another method
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:#"Login successful." delegate:self cancelButtonTitle:nil otherButtonTitles:nil];
[alert show];
[alert release];
[self timedAlert];
}
-(void)timedAlert
{
[self performSelector:#selector(dismissAlert:) withObject:alert afterDelay:2];
}
-(void)dismissAlert:(UIAlertView *) alertView
{
[alertView dismissWithClickedButtonIndex:nil animated:YES];
}
If the cancelButton of the alertView is set to "nil", how will the "[alertView dismissWithClickedButtonIndex:0 animated:YES];" thing work??? I tried making the cancelButton "nil" and it worked, but cant figure out how....
P.S: I call the timedAlert method from another
Any help is appreciated! Thank you!
First let me say it would be better if you handle this with a custom view, but with that said the problem looks to be with
[alert release];
You are releasing the object before you are done with it (I am surprise it does not crash).
Do something like this
// other code
alert = [[UIAlertView alloc] initWithTitle:nil message:#"Login successful." delegate:self cancelButtonTitle:nil otherButtonTitles:nil];
[alert show];
[self performSelector:#selector(dismissAlert:) withObject:alert afterDelay:3.0f];
}
-(void)dismissAlert:(UIAlertView *) alertView
{
[alertView dismissWithClickedButtonIndex:nil animated:YES];
[alertView release];
}
Your code should work, and you should have no problems. I have done this in one of my previous apps. The button is not displayed because the title is nil but I think the instance of the button still exists. Put a breakpoint before closing your alert and take a look at the alert variable, and check to see if there is a buttons array or something, that should tell you how that works.