After converting to ARC I am getting "message sent to deallocated instance" - ios

Question

I am creatinng an instance of a View like this...
- (IBAction)findPatientTapped:(id)sender {
RequestDialogViewController *findPatientViewController = [[RequestDialogViewController alloc] initWithNibName:#"RequestDialogViewController" bundle:nil];
findPatientViewController.delegate = self;
findPatientViewController.autoCorrectOff = YES;
findPatientViewController.defaultResponse = #"";
findPatientViewController.keyboardType = #"ASCII";
findPatientViewController.returnKeyType = #"Go";
findPatientViewController.tag = findRequestTag;
findPatientViewController.editSet = YES;
findPatientViewController.titleText = #"Find Patient";
findPatientViewController.messageText =#"Enter all or a portion of the patient's name...";
findPatientViewController.messageText2 = #"Last Name...";
findPatientViewController.messageText3 = #"First Name...";
findPatientViewController.showResponse2 = YES;
findPatientViewController.showNavBarSaveButton = NO;
findPatientViewController.infoTextFile = #"";
findPatientViewController.view.frame = CGRectMake(280, 230, 480, 300);
[self.view addSubview:findPatientViewController.view];
}
The view contains 2 UITextField fields for entry by the user. This all worked fine before running the convert to ARC tool. After the conversion the view crashes when trying to enter a value in either of the 2 fields with...
-[RequestDialogViewController respondsToSelector:]: message sent to deallocated instance
Here is the .h file of the UIViewController after running the conversion to ARC tool...
#import <UIKit/UIKit.h>
#protocol RequestDialogViewControllerDelegate;
#interface RequestDialogViewController : UIViewController <UITextFieldDelegate>{
id<RequestDialogViewControllerDelegate> __weak delegate;
IBOutlet UINavigationBar *navBar;
IBOutlet UITextField *response;
IBOutlet UITextField *response2;
IBOutlet UILabel *message;
IBOutlet UILabel *message2;
IBOutlet UILabel *message3;
IBOutlet UIButton *saveButton;
NSTimer *selectAllTimer;
NSString *defaultResponse;
NSString *titleText, *infoTextFile;
NSString *messageText, *messageText2, *messageText3;
NSString *placeHolderText;
NSString *keyboardType, *returnKeyType;
BOOL editSet, showSaveButton,showNavBarSaveButton, showResponse2, autoCorrectOff;
int tag;
}
#property (weak) id<RequestDialogViewControllerDelegate> delegate;
#property (nonatomic, strong)IBOutlet UITextField *response;
#property (nonatomic, strong) IBOutlet UITextField *response2;
#property (nonatomic, strong)IBOutlet UILabel *message;
#property (nonatomic, strong)IBOutlet UILabel *message2;
#property (nonatomic, strong) IBOutlet UILabel *message3;
#property (nonatomic, strong)IBOutlet UIButton *saveButton;
#property (nonatomic, strong)NSString *defaultResponse;
#property (nonatomic, strong)NSString *titleText, *infoTextFile;
#property (nonatomic, strong)NSString *messageText, *messageText2, *messageText3;
#property (nonatomic, strong)NSString *placeHolderText;
#property (nonatomic, strong)NSString *keyboardType, *returnKeyType;
#property (nonatomic, strong)IBOutlet UINavigationBar *navBar;
#property (readwrite)BOOL editSet, showSaveButton, showNavBarSaveButton, showResponse2, autoCorrectOff;
#property (readwrite)int tag;
#property (nonatomic, strong) NSTimer *selectAllTimer;
- (IBAction)saveButtonPressed:(id)sender;
- (void)selectAll;
- (IBAction)editingDidEnd:(id)sender;
#end
#protocol RequestDialogViewControllerDelegate <NSObject>
#optional
- (void)requestDialogViewDidDismiss:(RequestDialogViewController *)controller withResponse:(NSString*)reqResponse response2:(NSString*)reqResponse2;
#end
Here is the pertenant references in the .h file of the class creating the instance of the RequestDialog view...
#import "RequestDialogViewController.h"
#interface OrthoViewController : UIViewController <RequestDialogViewControllerDelegate>{
}
- (void)requestDialogViewDidDismiss:(RequestDialogViewController *)controller withResponse:(NSString*)reqResponse response2:(NSString*)reqResponse2;
#end
What do I need to do to make this work under ARC? I am thinking it might have something to do with how the protocol is formed.
Thanks,
John
**** Thanks to Dan I resolved this by making findPatientViewController a property of the calling class...
RequestDialogViewController *findPatientViewController;
#implementation OrthoViewController
- (IBAction)findPatientTapped:(id)sender {
findPatientViewController = [[RequestDialogViewController alloc] initWithNibName:#"RequestDialogViewController" bundle:nil];
//set all the properties and add the subview
}
#end

Answer 1

Your findPatientViewController has nothing retaining it, so it gets deallocated at the end of the method where you create it. Then, when something in it's view tries to call a delegate method on it you get that crash.
If findPatientTapped is a method in a view controller then you should add the findPatientViewController as a child view controller. If it's in a view, then you need to least store the findPatientViewController in a property so it doesn't get deallocated while you are still using it.
Your code didn't really work properly before ARC, you just had a memory leak.