I am looking to prompt the user to enter his/her name at the beginning of a game I am building.
What is the best way to get input from the user in cocos2d?
Thank you,
Joey
Cocos2d doesn't have any text input controls but you can easily add UIKit controls to the scene in Cocos2d 2.0
[[CCDirector sharedDirector] view] addSubview:myTextField];
You can use a UIAlertView with a text field embedded.
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Title" message:#"Message" delegate:self cancelButtonTitle:#"Done" otherButtonTitles:nil];
alert.alertViewStyle = UIAlertViewStylePlainTextInput;
[alert show];
//[alert release]; If not using ARC
To receive the events back from the UIAlertView you implement the UIAlertViewDelegate. In your header file add the delegate protocol to your interface
#interface BTMyScene : CCLayer <UIAlertViewDelegate>
Then in your implementation file add any of the methods from the delegate protocol you want to receive notifications for. You probably want this one
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
UITextField *textField = [alertView textFieldAtIndex:0];
NSString *name = textField.text;
}
I recommend reading the documentation for UIAlertView and UIAlertViewDelegate. You will see all the available methods that you can use.
Related
#import <UIKit/UIAlertView.h>
#class NSObject;
#interface SBIconController : NSObject
+ (SBIconController *)sharedInstance;
- (BOOL)isEditing;
#end
%hook SBIconController
-(void)iconTapped:(id)tapped {
SBIconController *sbic = [objc_getClass("SBIconController") sharedInstance];
if ([sbic isEditing]) {
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:#"Message" message:[NSString stringWithFormat:#"%#", tapped] delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alertView show];
[alertView release];
}
%orig;
}
%end
Above is a simple tweak that I have created with Logos. For some reason after installing, nothing is working, I just can't figure out what the problem is and How can I solve this problem?
Other questions that I have are:
Why do we declare class like SBIconController when there's already a SBIconController class?
Why do we declare it as a subclass of NSObject?
Why don't we just type in SBIconController when we're calling the [SBIconController sharedInstance] instead of [objc_getClass("SBIconController") sharedInstance]?
Thanks a lot for your help!
The code is fine. I tested it (I don't use logos) and iconTapped: method is indeed called when you tap an app icon. But what are you trying to achieve with isEditing? This property indicates whether you are editing SpringBoard (tap and hold an app icon) and when it equals YES method iconTapped: is NOT called when icon is tapped. It's called only when isEditing equals NO. So I suggest you insert alert without if ([sbic isEditing]) to test whether your tweak is working.
As for your other questions:
When dealing with private APIs we don't have headers and will get warnings/errors if we try to use them. In your case it's SBIconController. To solve this problem we can either download headers that others dumped using various tools like class-dump or declare these private APIs yourself. In your case it's latter.
Because SBIconController inherits from NSObject.
You can do it either way. Of course, when you have class declaration you don't need to use objc_getClass. And in your case you don't even need either of this things. You can just use self like you would in any other obj-C method. Your code will look like this:
%hook SBIconController
-(void)iconTapped:(id)tapped {
if ([self isEditing]) {
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:#"Message" message:[NSString stringWithFormat:#"%#", tapped] delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alertView show];
[alertView release];
}
%orig;
}
%end
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.
I create a class to call UIAlertview show on my screen. I write the UIAlert function in another class. Both these two classes are not my viewController class.
I use this UIAlert, which is a UITextfield inside, to store texts into a plist file.
here is the class to call UIAlert:
#import "Story.h"
#implementation Story
...
+ (void)stage1
{
AlertClass *pointer = [AlertClass new];
[pointer doAlert];
}
here is the class AlertClass.m file:
- (void)doAlert
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Title" message:#"Message" delegate:self cancelButtonTitle:#"Done" otherButtonTitles:nil];
alert.alertViewStyle = UIAlertViewStylePlainTextInput;
[alert show];
}
//this makes crash!
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
self.storyFlow.text = [alertView textFieldAtIndex:0].text;
}
Before I add UIAlertViewDelegate in the .h and override the method "clickedButtonAtIndex", it works great. However, I need to store some data from the UITextfield inside the alert view. I get crash and don't know the message it responds as following.
Please help me to solve this problem. Thanks.
[crash pic] https://dl.dropbox.com/u/47381923/crash.tiff
do an NSLog on the text you get back from the Alert View to see whether that is the crash or the subsequent 'self.storyFlow.text = ' is causing it. Perhaps self.storyFlow has not been created yet (with alloc/init)
Can anyone tell me how i can add text in TweetSheet when an UIAlert Title button is pressed?
Currently i am using this code to achieve it, but failed so far.
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
NSString *title = [alertView buttonTitleAtIndex:buttonIndex];
TWTweetComposeViewController *tweetSheet = [[TWTweetComposeViewController alloc] init];
if ([title isEqualToString:#"Add custom text"]) {
UIAlertView *alert= [[UIAlertView alloc] initWithTitle:#"Add a template" message:nil delegate:self cancelButtonTitle:#"Hi it was nice meeting you" otherButtonTitles:nil, nil];
[alert show];
[alert release];
}
if ([title isEqualToString:#"Hi it was nice meeting you"]) {
[tweetSheet setInitialText:#"hey it was nice meeting you"];
}
}
Can anyone tell me what's wrong here?
You're not presenting your TWTweetComposeViewController you can do this simply by adding :
[self presentModalViewController:tweetSheet animated:YES];
I guess this code is only for a simple test tweet.
For a serious project you should always:
Check if the user can send tweets by calling +(BOOL)canSendTweet before trying to show the TWTweetComposeViewController
If not sure about the properties you'll be setting (text, images, urls), you need to check if adding them was successful : -(BOOL)addImage:(UIImage *)image, -(BOOL)addURL:(NSURL *)url and -(BOOL)setInitialText:(NSString *)text all return YES if it was successful and NO if not.
You can set a completion handler to perform different actions depending on what the user decided (send tweet/cancel)
The WWDC session about Twitter integration from 2011 is very simple and detailed, you should watch it and read the documentation if you need more information.
How do you pass a variable to the UIAlertView delegate?
I have a variable that I want to use in the alert view delegate. It is only used in the function that shows the UIAlertView and the UIAlertView delegate, so i don't think it should be a property on the controller. Is there a way to attach the variable to UIAlertView and retrieve it in the delegate?
- (void) someUserCondition:(SOCode *)userCode {
if ([userCode warrentsConfirmation] > 0) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Title" message:#"Are you sure?" delegate:self cancelButtonTitle:#"Cancel" otherButtonTitles:#"OK",nil];
[alert setAlertViewStyle:UIAlertViewStyleDefault];
//TODO somehow store the code variable on the alert view
[alert show];
}
}
- (void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
NSString *title = [alertView buttonTitleAtIndex:buttonIndex];
if ([title isEqualToString:#"OK"]){
SOCode *userCode = //TODO somehow get the code from the alert view
[self continueWithCode:code];
}
}
in .h before interface:
extern const char MyConstantKey;
#interface ViewController...
in .m import:
import <objc/runtime.h>
in .m before implementation
const char MyConstantKey;
in .m implementation
-(void)viewDidAppear:(BOOL)animated{ //or wherever
NSString *aString = #"This is a string";
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Testing" message:#"test is test" delegate:self cancelButtonTitle:#"Okay" otherButtonTitles:nil];
[alert show];
[alert release];
objc_setAssociatedObject(alert, &MyConstantKey, aString, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
in .m alertview callback
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
NSString *associatedString = objc_getAssociatedObject(alertView, &MyConstantKey);
NSLog(#"associated string: %#", associatedString);
}
Use Associated Objects. It is described in more detail here: Your New Friends: Obj-C Associated Objects
To set the object you use use:
objc_setAssociatedObject(alert, &key, userCode, OBJC_ASSOCIATION_RETAIN);
And then to get it back:
SOCode *userCode = objc_getAssociatedObject(alertView, &key);
You also need to add static char key; so that it is in the scope of moth methods.
Update
I have wrapped this into a category on UIAlertView. You can use Cocoapods to bring it in:
pod 'HCViews/UIAlertViewHCContext', '~> 1.2'
The source is available here: https://github.com/hypercrypt/HCViews/blob/master/Categories/UIAlertView%2BHCContext.h
A lot of posts talk about the concepts behind associated objects (which is good!) but sometimes you just want to see the code. Here's a clean and quick category that you can either put in a separate file or above the interface of one of your existing .m files (you could even replace UIAlertView with NSObject and effectively add a context property to any object):
#import <objc/runtime.h>
#interface UIAlertView (Private)
#property (nonatomic, strong) id context;
#end
#implementation UIAlertView (Private)
#dynamic context;
-(void)setContext:(id)context {
objc_setAssociatedObject(self, #selector(context), context, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
-(id)context {
return objc_getAssociatedObject(self, #selector(context));
}
#end
And then you'll be able to do something like:
NSObject *myObject = [NSObject new];
UIAlertView *alertView = ...
alertView.context = myObject;
IMPORTANT:
And don't forget to nil the context in dealloc!!
UIAlertView is a subclass of UIView which has a tag property you can set to an integer. Unfortunately if you need something other than an integer to identify/pass info to the delegate than you will need to set some properties (or set up an array with the tag indexing into it) on the delegate itself. Advaith's way will probably work but is technically not supported by Apple.
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Title" message:#"Are you sure?" delegate:self cancelButtonTitle:#"Cancel" otherButtonTitles:#"OK",nil];
[alert setAlertViewStyle:UIAlertViewStyleDefault];
alert.tag = SOMEINTEGER;
[alert show];
I suspect the most straight-forward way is a property in the alert view's delegate class. An alert view doesn't have any provision for "user info" and doesn't support sub-classing, which removes the only shortcuts that come to mind.
Subclass UIAlertView, add a property called userInfo with type of your choice. Set the user info value at the time you create an instance of Subclassed UIAlertView, and retrieve it from within the delegate method. (There you will get the subclassed instance which holds the userInfo)