你能帮我吗，我的应用程序快完成了，我现在正在优化它，所以我正在使用 Instrument Allocations 工具，我的视图控制器有问题，但我不知道为什么内存每次我从主视图转到详细视图控制器时都会增加。
这是似乎是问题的代码部分：
- (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];
}
这是 detailViewController.h 的代码：
#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
这就是 detailViewController.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];
}
对不起，我知道这是一段很长的代码，但我不知所措。请帮我。
正如你们所建议的，我做了以下修改：
我还更改了代码的 viewDidUnload 和 Dealloc 部分，现在看起来像这样：
我不太了解 release + nil 的概念，也不太了解在 dealloc 中调用 [self.object release] 和 [object release] 以及在 viewDidUnload 中调用 self.object = nil 之间的区别。