遺棄的內存問題

Question

您能幫我個忙嗎，我的應用程序快要完成了，我現在正在對其進行優化，因此我正在使用儀器分配工具，但視圖控制器存在問題，但我不知道為什么要使用內存每當我從主視圖轉到detailedViewController時，它都會增加。

這是似乎是問題的代碼部分：

  - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

// Create and push a detail view controller.

    self.entriesDetailedViewController = [[EntriesDetailedViewController alloc]init];

Entry *selectedEntry = (Entry *)[[self fetchedResultsController] objectAtIndexPath:indexPath];

self.entriesDetailedViewController.entry = selectedEntry;

[self.navigationController pushViewController:self.entriesDetailedViewController animated:YES];
[self.entriesDetailedViewController release];
}

這是detailedViewController.h的代碼：

  #import <UIKit/UIKit.h>


  @class Entry;

 @interface EntriesDetailedViewController : UIViewController <UITextViewDelegate> {

//IBOutlet UIButton *createEntryButton;
IBOutlet UITextField *entryTextField1;
IBOutlet UITextView *entryTextField2;
IBOutlet UIBarButtonItem *textbodyBarButton;
IBOutlet UIBarButtonItem * catLabel;
IBOutlet UINavigationBar *entryNameToolBar;
IBOutlet UINavigationBar *textBodyToolBar;
IBOutlet UIImageView *reviewCheck;
IBOutlet UIImageView *textBackground;
IBOutlet UIBarButtonItem *reviewButton;
BOOL isChecked;

NSManagedObjectContext *managedObjectContext;


Entry *entry;

    }


 @property (nonatomic,retain) IBOutlet UITextField *entryTextField1;
 @property (nonatomic,retain) IBOutlet UITextView *entryTextField2;
 @property (nonatomic,retain) IBOutlet UIBarButtonItem *textbodyBarButton;
 @property (nonatomic,retain) IBOutlet UIBarButtonItem *catLabel;
 @property (nonatomic,retain) IBOutlet UINavigationBar *entryNameToolBar;
 @property (nonatomic,retain) IBOutlet UINavigationBar *textBodyToolBar;
 @property (nonatomic,retain) IBOutlet UIImageView *reviewCheck;
 @property (nonatomic,retain) IBOutlet UIBarButtonItem *reviewButton;
 @property BOOL isChecked;
 @property (nonatomic,retain) IBOutlet UIImageView *textBackground;

 @property (nonatomic,retain) NSManagedObjectContext *managedObjectContext;
 @property (nonatomic, retain) Entry *entry;


 - (void)setUpUndoManager;
 - (void)cleanUpUndoManager;
 - (void)textViewDidBeginEditing:(UITextView *)entryTextField2;
 - (void)textViewDidEndEditing:(UITextView  *)entryTextField2;
 - (void)saveContext;



 - (IBAction)dismisskeyboard;
 - (IBAction)dismissKeyboardfromTextView;
 - (IBAction) selectReview;


 @end

這是detailedViewController.m：

  #import "EntriesDetailedViewController.h"
  #import "Entry.h"
  #import "TheLearningMachineAppDelegate.h"


  @implementation EntriesDetailedViewController

  @synthesize entryTextField1,entryTextField2,textbodyBarButton,managedObjectContext,catLabel, entryNameToolBar,textBodyToolBar, reviewCheck,reviewButton,isChecked,textBackground, entry, undoManager;


  #pragma mark -
  #pragma mark View lifecycle


  - (void)viewWillAppear:(BOOL)animated {

  }

  - (void)viewDidLoad {
      [super viewDidLoad];

  // Configure the title, title bar, and table view.

      self.title = @"Consultation";

    UIBarButtonItem *rightButton = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(save:)]; 
self.navigationItem.rightBarButtonItem = rightButton; 
[rightButton release];

[self setUpUndoManager];

self.entryTextField1.text = self.entry.entryname;
self.entryTextField2.font = [UIFont fontWithName:@"Helvetica" size:17.0];
self.entryTextField2.text = self.entry.textbody;
self.catLabel.title = self.entry.category;
[self.entryTextField2 setFrame:CGRectMake(24, 56, 273, 140)];

self.textBackground.image = [UIImage imageNamed:@"alert_background.png"];
[self.textBackground setFrame:CGRectMake(0,46,312,140)];



  //Initializing a kind of checkBox button

if ([self.entry.active boolValue] == YES) {

    self.reviewCheck.image = [UIImage imageNamed:@"checkedwhitesquare.png"];

    self.isChecked = YES;
}

else {

    self.reviewCheck.image = [UIImage imageNamed:@"UncheckedWhiteSquare.png"];

    self.isChecked = NO;

}

  }


  - (IBAction) selectReview {

      if (isChecked==NO){
        self.reviewCheck.image = [UIImage imageNamed:@"checkedwhitesquare.png"];
    self.isChecked = YES;
    [self.entry setValue:[NSNumber numberWithBool:YES] forKey:@"active"];
    [self performSelector: @selector(save:)];

}
else {

    self.reviewCheck.image = [UIImage imageNamed:@"UncheckedWhiteSquare.png"];

    self.isChecked = NO;
    [self.entry setValue:[NSNumber numberWithBool:YES] forKey:@"active"];
    [self performSelector: @selector(save:)];

}

  }



  - (void)textViewDidBeginEditing:(UITextView  *)entryTextField2{
[self.navigationController setNavigationBarHidden:YES animated:YES];
self.entryNameToolBar.hidden =YES; 
self.textBodyToolBar.hidden =NO;
self.textbodyBarButton.style =UIBarButtonItemStyleBordered;
self.textbodyBarButton.title =@"Terminer la saisie";
[self.entryTextField2 setFrame:CGRectMake(24, 50, 273, 140)];
[self.textBackground setFrame:CGRectMake(0,46,312,140)];
  }

  - (IBAction)textViewDidEndEditing: (UITextView  *)entryTextField2{
      [self.navigationController setNavigationBarHidden:NO animated:YES];
      self.entryNameToolBar.hidden =NO;
      self.textBodyToolBar.hidden =YES;
      [self.entryTextField2 setFrame:CGRectMake(24, 50, 273, 140)];
      [self.textBackground setFrame:CGRectMake(0,46,312,140)];
      self.textbodyBarButton.style =UIBarButtonItemStyleDone;
      self.textbodyBarButton.title =@"Corps de texte";  

  }

  - (IBAction)dismisskeyboard{

[self.entryTextField1 resignFirstResponder];
  }

  - (IBAction)dismissKeyboardfromTextView{

[self.entryTextField2 resignFirstResponder];

  }

  - (void)saveContext {

      NSError *error = nil;
      if (self.managedObjectContext != nil) {
          if ([self.managedObjectContext hasChanges] && ![self.managedObjectContext save:&error]) {

        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Erreur" 
        message:@"blabla" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
        [alert release];


        abort();

          } 
      }
  }  


  - (IBAction)save:(id)sender {

      // if there's text in textfield1 and textfield2 and a category has been set 
      if (([self.entryTextField1.text length]!= 0) && ([self.entryTextField2.text length]!= 0) && ([self.catLabel.title length]!= 0)){ 

    [self.entry setValue:self.entryTextField1.text forKey:@"entryname"];
    [self.entry setValue:self.entryTextField2.text forKey:@"textbody"];
    [self.entry setValue:self.catLabel.title forKey:@"category"];

    if (self.isChecked == YES) {
        [self.entry setValue:[NSNumber numberWithBool:YES]forKey:@"active"];
    }
    else {

        [self.entry setValue:[NSNumber numberWithBool:NO] forKey:@"active"];
    }

    [self.entry setValue:[NSNumber numberWithBool:NO] forKey:@"editable"];

    //save
    NSError *error;
    [self.managedObjectContext save:&error];
    [self saveContext];

    //Return to mainview
    [self.navigationController popViewControllerAnimated:YES];
    [self.entry release];
    //self.entry =nil;
}

else {

    if([self.entryTextField1.text length] ==0){

        UIAlertView *alert =[[UIAlertView alloc] 
                             initWithTitle:@"Oooops..." 
                             message:@"Your entry has no name" 
                             delegate:nil 
                             cancelButtonTitle: @"ok" 
                             otherButtonTitles:nil];
        [alert show];
        [alert release];

    }
    else {

        if ([self.entryTextField2.text length]==0){

            UIAlertView *alert =[[UIAlertView alloc] initWithTitle:@"Oooops..." message:@"Your list is empty" delegate:nil cancelButtonTitle: @"ok" otherButtonTitles:nil];
            [alert show];
            [alert release];

        }
        else {

            if ([self.catLabel.title length]==0){

                UIAlertView *alert =[[UIAlertView alloc] initWithTitle:@"Oooops..." message:@"You need to choose a category for this list first." delegate:nil cancelButtonTitle: @"ok" otherButtonTitles:nil];
                [alert show];
                [alert release];

                  }
              }

          }
      }
   }


  - (void)setEditing {
  //    [super setEditing:editing animated:animated];
  }




  #pragma mark -
  #pragma mark Undo support

  - (void)setUpUndoManager {

    if (self.entry.managedObjectContext.undoManager == nil) {

    NSUndoManager *undoMgr = [[NSUndoManager alloc] init];
    [undoMgr setLevelsOfUndo:1];
    self.entry.managedObjectContext.undoManager = undoMgr;
    [undoMgr release];


    }

    // Register as an observer of the entry's context's undo manager.
    NSUndoManager *entryUndoManager = self.entry.managedObjectContext.undoManager;
NSNotificationCenter *dnc = [NSNotificationCenter defaultCenter];
    [dnc addObserver:self selector:@selector(undoManagerDidUndo:) name:NSUndoManagerDidUndoChangeNotification object:entryUndoManager];
    [dnc addObserver:self selector:@selector(undoManagerDidRedo:) name:NSUndoManagerDidRedoChangeNotification object:entryUndoManager];


  }


  - (void)cleanUpUndoManager {

      // Remove self as an observer.
      [[NSNotificationCenter defaultCenter] removeObserver:self];

      if (self.entry.managedObjectContext.undoManager == undoManager) {
          self.entry.managedObjectContext.undoManager = nil;
          self.undoManager = nil;
      }       
  }


  - (NSUndoManager *)undoManager {
      return self.entry.managedObjectContext.undoManager;
  }


  - (void)undoManagerDidUndo:(NSNotification *)notification {

  }


  - (void)undoManagerDidRedo:(NSNotification *)notification {

  }

  - (BOOL)canBecomeFirstResponder {
      return YES;
  }


  - (void)viewDidAppear:(BOOL)animated {
      [super viewDidAppear:animated];
      [self becomeFirstResponder];
  }


  - (void)viewWillDisappear:(BOOL)animated {
      [super viewWillDisappear:animated];
      [self resignFirstResponder];
  }

- (void)viewDidUnload {

// Release any properties that are loaded in viewDidLoad or can be recreated lazily.


self.entryTextField1 =nil;
self.entryTextField2 = nil;
self.catLabel = nil;
self.entryNameToolBar = nil;
self.textBodyToolBar = nil;
self.reviewCheck = nil;
self.textBackground = nil;
self.reviewButton = nil;
self.entry = nil;
self.navigationItem.rightBarButtonItem = nil;
[self cleanUpUndoManager];
self.entry.managedObjectContext.undoManager = nil;


}

  - (void)dealloc {

[entryTextField1 release], entryTextField1 = nil;
[entryTextField2 release], entryTextField2 = nil;
[catLabel release], catLabel = nil;
[entryNameToolBar release], entryNameToolBar = nil;
[textBodyToolBar release], textBodyToolBar = nil;
[reviewCheck release], reviewCheck = nil;
[textBackground release], textBackground = nil;
[reviewButton release], reviewButton = nil;
[self cleanUpUndoManager];
[entry.managedObjectContext.undoManager release],  
     entry.managedObjectContext.undoManager = nil;
[entry release],entry = nil;
[managedObjectContext release];


[super dealloc];
}

抱歉，這是我知道的很多代碼，但我很茫然。 請幫我。

正如你們所建議的，我做了以下修改：

我還更改了代碼的viewDidUnload和Dealloc部分，現在看起來像這樣：

我不太了解release + nil的概念，也不了解在dealloc中調用[self.object release]和[object release]以及在viewDidUnload中調用self.object = nil之間的區別。

Answer 1

您應該期望每次分配新的EntriesDetailedViewController時，內存使用量都會增加。 我以為您的意思是釋放記憶時記憶不會消失嗎？ 您可能沒有在-[EntriesDetailedViewController dealloc]正確釋放某些內容。

請注意， EntriesDetailedViewController每次都生成一個新的EntriesDetailedViewController ，不如在您第一次需要時創建一個，並繼續使用setEntry:對其進行重新配置，可能會更好。 您已經設置了ivar來容納視圖控制器。 不妨利用它。

Answer 2

從您發布的代碼來看，原因並不明顯，但是Instruments會向您顯示每次分配的發生位置，因此跟蹤它並不難。

Answer 3

您應該在dealloc中使用以下形式：

[entryTextField1 release], entryTextField1 = nil;

您應該使用此表單進行設置（例如，在viewDidUnload ）：

self.entryTextField1 = nil;

運行靜態分析應該會遇到更多問題。 修復它們。

糾正所有問題后，請重新運行該應用程序。 （我假設不會100％覆蓋）

另外，請確保使用版本控制。 您會發現自己遇到了很多問題-在解決所有問題之前，您應該一直期待更多問題/崩潰。

不幸的是，您無法永遠避免出現內存問題，要追蹤其中的一些問題很痛苦-同時學習適當的內存管理（現在，這很困難）。 祝好運！

Answer 4

嘿，你知道嗎？ 我才發現!!!!!!!! 我有多愚蠢...如果仔細查看entriesDetailedViewController.h文件，可以看到有一個聲明的textbodyBarButton ...好吧，它沒有發布，我已經忘了那個...

因此，很抱歉使您失去時間。

我剛剛添加了：

    self.textbodyBarButton = nil;
[textbodyBarButton release];

現在我很好，當我回到rootViewController時，所有的內存都被釋放了。

因此，如果你們有一天遇到同樣的問題，那可能會很愚蠢。 只需檢查一下.h文件中聲明的內容即可。

哇，花了3天時間...

非常感謝大家，再次感謝您的耐心配合。