I'm sort of stuck on a UIAlertViewStylePlainTextInput. (My code is too long to post here, but this is the part where the problem exists.) It all sort of works, but the program doesn't wait until the user enters the information before continuing. The "editName" button doesn't change the display in the code below, but the updateDisplay button works fine (if you've pressed the "editName" button before you pressed "updateDisplay"). How can I get everything to sort of halt until the user enters the info (or cancels). Or is there some other lead that will take me where I need to go. (I've been toying with putting the rest of the code in the -(void) alertView, but that just doesn't seem to be the correct way of doing it).
Thanks in advance.
#import "HSTestViewController.h"
#implementation HSTestViewController
#synthesize display;
NSString *newName;
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 1)
{
newName = [[alertView textFieldAtIndex:0] text];
}
}
- (void) getNewName;
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"You made the High Score List"
message:#"Please enter your name"
delegate:self
cancelButtonTitle:#"Cancel"
otherButtonTitles:#"Ok", nil];
alert.alertViewStyle = UIAlertViewStylePlainTextInput;
[alert show];
}
- (IBAction)editName:(id)sender
{
[self getNewName];
newName = display.text;
}
- (IBAction)updateDisplay:(id)sender
{
display.text = newName;
}
#end
Add UIAlertViewDelegate to the class. And implement the below delegate method.
OK button index value will be 1 in your case.
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex)
{
// call the method or the stuff which you need to perform on click of "OK" button.
}
}
Hope this helps.
Related
I'm writing a puzzle game. When the user presses the check button, I see if the solution they entered is correct. Depending on the result, I present one of two action sheets for them. For now I just have some NSLog statements to make sure things are getting called, but only one of the sheets seems to work properly.
Nothing gets called when I click a button in showErrorsActionSheet. The action sheet disappears off the screen, but the logs never print.
I suspect it has something to do with having two actionsheets declared to the same delegate (self)
- (void) checkSolution {
//code determines the value of the BOOL allCorrect
if (allCorrect) { //IF ALL OF THE LETTERS WERE CORRECT
//display UIAlertView;
NSLog(#"allCorrect");
UIActionSheet *levelCompleteActionSheet = [[UIActionSheet alloc] initWithTitle:#"Congratulations! You Have Finished the Level!" delegate:self cancelButtonTitle:#"Review my work" destructiveButtonTitle:#"Choose next puzzle" otherButtonTitles:nil, nil];
[levelCompleteActionSheet showInView:self.view];
[levelCompleteActionSheet release];
}
else {
//[self showIncorrectLettersInRed];
UIActionSheet *showErrorsActionSheet = [[UIActionSheet alloc] initWithTitle:#"Sorry, thats not right. Show errors in red?" delegate:self cancelButtonTitle:#"No Thanks, I'll keep trying" destructiveButtonTitle:#"Yes please, I'm stuck!" otherButtonTitles:nil, nil];
[showErrorsActionSheet showInView:self.view];
[showErrorsActionSheet release];
}
}
the methods that are supposed to be called are:
- (void) levelCompleteActionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex {
if (buttonIndex != [actionSheet cancelButtonIndex]) {
NSLog(#"return to levelSelect");
//pushViewController:levelSelect
}
else {
NSLog(#"continue to examine solution");
}
}
- (void) showErrorsActionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex {
if (buttonIndex != [actionSheet cancelButtonIndex]) {
NSLog(#"show errors in red");
}
else {
NSLog(#"continue to try");
}
}
and Ive declared the UIActionSheet protocol in the interface file as follows:
#interface GamePlay : UIViewController <UIActionSheetDelegate> {
Set a tag for each actionSheet, then use a switch statement in the UIActionSheet delegate.
Assign a tag
- (void)checkSolution
{
if (allCorrect)
{
UIActionSheet *levelCompleteActionSheet = [[UIActionSheet alloc] initWithTitle:#"Congratulations! You Have Finished the Level!" delegate:self cancelButtonTitle:#"Review my work" destructiveButtonTitle:#"Choose next puzzle" otherButtonTitles:nil, nil];
[levelCompleteActionSheet setTag: 0];
[levelCompleteActionSheet showInView:self.view];
[levelCompleteActionSheet release];
}
else
{
UIActionSheet *showErrorsActionSheet = [[UIActionSheet alloc] initWithTitle:#"Sorry, thats not right. Show errors in red?" delegate:self cancelButtonTitle:#"No Thanks, I'll keep trying" destructiveButtonTitle:#"Yes please, I'm stuck!" otherButtonTitles:nil, nil];
[showErrorsActionSheet setTag: 1];
[showErrorsActionSheet showInView:self.view];
[showErrorsActionSheet release];
}
}
UIActionSheet Delegate
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
switch ( actionSheet.tag )
{
case 0: /* levelCompleteActionSheet */
{
switch ( buttonIndex )
{
case 0: /* 1st button*/
break;
case 1: /* 2nd button */
break;
}
}
break;
case 1: /* showErrorsActionSheet */
break;
}
}
The same would apply anywhere else in this class as well, including levelCompleteActionSheet: and showErrorsActionSheet:. The only difference is, you would need to create an iVar for each actionSheet instead of creating them in checkSolution.
The methods that will be called by a UIActionSheet on its delegate are the methods listed in the UIActionSheetDelegate protocol.
http://developer.apple.com/library/ios/#documentation/uikit/reference/UIModalViewDelegate_Protocol/UIActionSheetDelegate/UIActionSheetDelegate.html
To be called, your method must be one of those methods. I don't see levelCompleteActionSheet or showErrorsActionSheet listed in that protocol! :) Your method must be named actionSheet:clickedButtonAtIndex:, and not some name you make up out of whole cloth.
Using Tag solve this problem
levelCompleteActionSheet.tag = 100;
showErrorsActionSheet.tag = 101;
- (void) levelCompleteActionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex {
if(actionSheet.tag == 100){
// levelCompleteActionSheet implement your required function
}
else if(actionSheet.tag == 101){
// showErrorsActionSheet implement your required function
}
}
I have multiple alert views in one view, and I use this code to detect which button was pressed:
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
NSString *title = [alertView buttonTitleAtIndex:buttonIndex];
if ([title isEqualToString:#"OK"]) {
//for one alert view
[passCode becomeFirstResponder];
} else if ([title isEqualToString:#" OK "]) {
//for another alert view, had to change "OK" to " OK "
[passCodeConfirm becomeFirstResponder];
}
}
Now since there are multiple alert views in one view that do different things, I have to trick the user into thinking "OK" and " OK " are the same thing. It works and looks fine, but it feels kind of messy. Surely there is another way to do this, such as making this specific to an alert view, and then making it specific to another. Do you know how I would do this? Thanks!
It would be more technical as well better that set unique tag for separate UIAlertView and identify it and access in its delegate method.
For example,
UIAlertView *alert=[[UIAlertView alloc]initWithTitle:#"Message" message:#"Are You Sure you want to Update?" delegate:self cancelButtonTitle:#"Cancel" otherButtonTitles:#"Ok",nil];
[alert setTag:1];
[alert show];
[alert release];
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if(alertView.tag == 1)
{
// set your logic
}
}
Use tag property to uniquely identify each of the alertview u create.
Like this
myAlertView.tag = 1
Then in the clickedButtonAtIndex delegate method check which alertview's button was clicked using this tag property ,
if(alertView.tag==1)
I wouldn't use the titles to distinguish between the buttons. You'll run into problems when your app is localized or you decide to change the button titles, but forget to update them everywhere. Use the button indexes instead or if you only have one button in addition to a cancel button, use the cancelButtonIndex property of UIAlertView.
To distinguish between multiple alert views, you could use their tag property.
In your view, add a property for each alert view.
UIAlertView *myAlertType1;
UIAlertView *myAlertType2;
#property (nonatomic, retain) UIAlertView *myAlertType1;
#property (nonatomic, retain) UIAlertView *myAlertType2;
Create your alert using these properties
self.myAlertType1 = [[[UIAlertView alloc] initWithTitle: ... etc] autorelease];
[self.myAlertType1 show];
Then in your delegate method:
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
if (alertView == myAlertType1) {
// check the button types and add behaviour for this type of alert
} else if (alertView == myAlertType2 {
// check the button types and add behaviour for the second type of alert
}
}
Edit: Although the above works, iApple's suggestion of using the tag seems cleaner/simpler.
//in your .h file
UIAlertView* alert1;
UIAlertView* alert2;
//in your .m file
// when you are showing your alerts, use
[alert1 show]; //or
[alert2 show];
//and just check your alertview in the below method
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if(alertView == alert1)
{
//check its buttons
}
else //check other alert's btns
}
Is there a way I can add a .tag to an UIAlertView button? Reason being, I'm adding a few dynamic buttons to the alert that will sometimes be in the alert and sometimes not. I figured the best way was to add a tag. Is there a better method for this?
The options that will ALWAYS be in the alert are Email, Save. And the 2 optional options are Tweet This and Facebook.
Thanks for any help in advance!
There is one method buttonTitleAtIndex for UIAlertView. Use that to find the button tapped by user.
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
NSString *buttonString = [alertView buttonTitleAtIndex:buttonIndex];
if( [buttonString isEqualToString:#"Facebook"] ){
// your code here
} else if( [buttonString isEqualToString:#"twitter"] ){
// your code here
}
}
You can also use tag proprerty:
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Info"
message:#"Info text"
delegate:self
cancelButtonTitle:#"Ok"
otherButtonTitles:nil, nil];
[alert setTag:0];
Then in delegate:
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
switch (alertView.tag) {
case 1: {
...
break;
}
...
default:
break;
}
I have code that when a user hits the end of the game, it prompts them if the would like to play again:
-(void)showAlert
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#" B U S T E D ! "
message:#"Sorry, you busted!\n\nWant to try your luck 1 More Time! ?"
delegate:self
cancelButtonTitle:#"Cancel"
otherButtonTitles:#"New Game", nil];
[alert show];
[alert release];
}
- (void)alertView:(UIAlertView *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
// the user clicked one of the OK/Cancel buttons
if (buttonIndex == 0)
{
//here is where we can close it
}
if (buttonIndex == 1)
{
[self createNewGame];
}
}
Now I want to also do a check when a user first starts the app to see if a prior game file exists and if so ask if they want to continue. I know I can do via:
-(void)priorGameExists
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#" Previous Game Exists ! "
message:#"A previous game currently exists. Would you like to resume that game?"
delegate:self
cancelButtonTitle:#"Cancel"
otherButtonTitles:#"Resumse", nil];
[alert show];
[alert release];
}
But how do I have it go to a new "custom" clickedButtonAtIndex? Am I correct in assuming it has something to do with setting a different delegate? And if so, how would I do that?
You don't necessarily need a different delegate. Read my answer to this question:
iPhone - Several UIAlertViews for a delegate
One solution is to declare some UIAlertView as private class instance like that:
#interface myViewControllerInterface : UIViewController {
#private
UIAlertView *newGameAlert;
UIAlertView *resumeGameAlert;
}
Then in your view controller you can create your alertViews using them:
-(void)showAlert {
newGameAlert= [[UIAlertView alloc] initWithTitle:#" B U S T E D ! "
message:#"Sorry, you busted!\n\nWant to try your luck 1 More Time! ?"
delegate:self cancelButtonTitle:#"Cancel"
otherButtonTitles:#"New Game", nil];
[newGameAlert show];
[newGameAlert autorelease];
}
-(void)priorGameExists {
resumeGameAlert = [[UIAlertView alloc] initWithTitle:#" Previous Game Exists ! "
message:#"A previous game currently exists. Would you like to resume that game?"
delegate:self cancelButtonTitle:#"Cancel"
otherButtonTitles:#"Resumse", nil];
[resumeGameAlert show];
[resumeGameAlert autorelease];
}
And to finish you can make the difference between each alert view using their pointer:
- (void)alertView:(UIAlertView *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
if (actionSheet == newGameAlert ) {
//do something
} else if (actionSheet == resumeGameAlert ) {
//do something
}
}
You could use a different delegate but an easier way would be to set the tag property to a unique value. If tag was, say, 10 you'd know it was from the original alert and if it was 20 it would be from the priorGameExits question. (You should probably use constants of course.)
in your clickedButtonAtIndex method test the title of the incoming alertview.
if ([actionSheet.title isEqualToString:#" B U S T E D ! "]) {
// do some busted stuff here
else if ([actionSheet.title isEqualToString:#" Previous Game Exists ! "]) {
// do some previous game stuff here
}
You'll probably want to set those titles using static strings, so you only have the string in one place in your code, but this is basically how you'd do it.
I'm new to the iPhone and I would like to be able to use UIAlertView in a manner similar to the Windows MessageBox() or the MessageDlg() in Delphi.
For example, I have a method that needs to ask the user for confirmation on something, and proceed based on their response.
E.g. (pseudocode):
-(void)doSomething
{
[doStep1];
[doStep2];
var myValue = [getDefaultValue];
if (myValue = nil)
{
if [promptUser(#"No value in setting. Use the default value?")] //UIAlertView here?
{
myValue = #"defaultValue";
}
else
return; // bug out of the routine 'cause we have no value.
}
[doStep3 withValue:myValue];
}
Or, put put it another way- is there a way of using UIAlertView to ask the user a question within a routine as a way of controlling the logic flow of that routine?
There's no reason to subclass UIAlertView at all. That's what delegates are for. All you need is a class (such as your view controller) supporting the UIAlertViewDelegate protocol, and set the UIAlertView's delegate property to that class. You then implement the alertView:clickedButtonAtIndex: method in this class, and the alertViewCancel: method if you want to specifically handle cancellations differently.
You can read more about it in the UIAlertView documentation and in the UIAlertViewDelegate documentation.
I have no idea what MessageDlg() is, but you can certainly subclass UIAlertView and handle the dialog response, based on which button is pressed, e.g.:
Set up the UIAlertView subclass header:
//
// ARReachabilityAlertView.h
//
#import <UIKit/UIKit.h>
#interface ARReachabilityAlertView : UIAlertView <UIAlertViewDelegate> {
}
#end
Set up the UIAlertView subclass implementation:
//
// ARReachabilityAlertView.m
//
#import "ARReachabilityAlertView.h"
#implementation ARReachabilityAlertView
- (id)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
[self setTitle:#"Error"];
[self setMessage:#"This application won't run without a network connection. Do you want to quit?"];
[self addButtonWithTitle:#"Quit"];
[self addButtonWithTitle:#"Continue"];
[self setDelegate:self];
}
return self;
}
- (void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
if (buttonIndex == 0)
exit(0); // quit application if "Quit" is pressed; otherwise, do nothing
}
- (void) drawRect:(CGRect)rect {
[super drawRect:rect];
}
- (void) dealloc {
[super dealloc];
}
#end
Note the alertView:clickedButtonAtIndex: delegate method. This handles the conditionals you use to decide how the application proceeds. You can send an NSNotification from here, or call a method in the application delegate, whatever you want.
In my example, this UIAlertView is instantiated if there is no network connection, and the application is closed if the user clicks "Quit" in the alert view. Otherwise, if the user clicks "Continue" the application keeps running as usual.
Note that the implementation of the subclass requires the drawRect: method be called. I'm not sure if this is a bug or not, since I'd expect the drawRect: method to be called in the super-class; I filed a bug report with Apple on this one, but I haven't heard anything. Comment it out if you want to see what the effect will be — it's kind of interesting.
I believe you're looking to use UIAlertView as a modal alert box (in the sense that you'd like your code to stop running until the user makes a selection). There's no easy way to do this, and it's really recommended that you NOT code for the iPhone in this manner. I think Alex's explanation is a good solution.
To do this, what you can do is to run the mainloop manually. I have not managed to stop the mainloop directly, so I instead run the mainloop for 0.5 seconds and wait until the user responds.
I ran into this question while researching the problem for a C#/MonoTouch user on the iPhone. The sample below is written for MonoTouch/C# but should be trivial to translate to Objective-C
The following function shows how you could implement a modal query with the above approach:
int WaitForClick ()
{
int clicked = -1;
var x = new UIAlertView ("Title", "Message", null, "Cancel", "OK", "Perhaps");
x.Show ();
bool done = false;
x.Clicked += (sender, buttonArgs) => {
Console.WriteLine ("User clicked on {0}", buttonArgs.ButtonIndex);
clicked = buttonArgs.ButtonIndex;
};
while (clicked == -1){
NSRunLoop.Current.RunUntil (NSDate.FromTimeIntervalSinceNow (0.5));
Console.WriteLine ("Waiting for another 0.5 seconds");
}
Console.WriteLine ("The user clicked {0}", clicked);
return clicked;
}
Just a quick tip: if you want a class to be a delegate for more than one UIAlertView, just use tag property to tell who is who:
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Clear all" message:#"Are you sure you want to erase everything?" delegate:self cancelButtonTitle:#"Cancel" otherButtonTitles:#"OK", nil];
alert.tag = ALERT_DELETE_TAG;
[alert autorelease];
[alert show];
Delegate methods are called with UIAlertView as first argument, and you can check who's the originator there.
Thanks to #miguel.de.icaza I found my solution like below (part of the code):
#interface MyClass: NSObject <UIAlertViewDelegate>
{
int confirmed;
}
- (BOOL) removeObjectAtIndex:(NSUInteger)index;
#end
#implementation
- (BOOL) removeObjectAtIndex:(NSUInteger)index
{
// delete confirmation alert
confirmed = -1;
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Delete confirmation" message:#"Are you sure to delete object" delegate:self cancelButtonTitle:#"Yes" otherButtonTitles: #"No", nil];
alert.tag = 2;
[alert show];
[alert release];
// wait for confirm (0 or 1)
while (confirmed == -1) {
// this is what you need!!!
[[NSRunLoop mainRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.5]];
}
if (confirmed) {
[myObjects removeObjectAtIndex:index];
return YES;
}
else
return NO;
}
- (void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
switch (alertView.tag) {
case 1:
// ...
break;
case 2:
if (buttonIndex == 0) // delete confirmed
confirmed = 1;
else // dismiss
confirmed = 0;
break;
default:
break;
}
}
#end