Iphone app with multiple views / subtitles: memory is not freed

Question

I have an application for iPhone that loads succesive views in a framework based on the one described in this link (basically the main ViewControllerone that loads / removes additional views using the method displayView). In my application, I use NIB (the example link uses encoded representations), although each of mine ViewControllershas its own accompanying nib.

Debugging in the Tools shows no leaks , but if I enter / leave a section (ViewController with its View.xib), the tip remains in memory, so after the accumulation of several inputs / outputs starts.

I know that nothing is uploaded because it is almost programmatically created (there are no things in IB), while the other has images and buttons created in IB. The big one loads first, and the next one loads small. You expect cutbacks in the Tools.

How can I prevent this?

My structure is as follows:

`MyAppDelegate.h`

#import <UIKit/UIKit.h>

@class RootViewController;

@interface MyAppDelegate : NSObject <UIApplicationDelegate> {
 UIWindow *window;
 RootViewController *viewController;
}

@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet RootViewController *viewController;

-(void) displayView:(int)intNewView;

@end

`MyAppDelegate.m`

#import "MyAppDelegate.h"
#import "RootViewController.h"

@implementation MyAppDelegate

@synthesize window;
@synthesize viewController;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
 [window addSubview:viewController.view];
 [window makeKeyAndVisible];
 return YES;
}

- (void)applicationDidReceiveMemoryWarning:(UIApplication *)application {
}

-(void) displayView:(int)intNewView {
 [viewController displayView:intNewView];
}

- (void)dealloc {
 [viewController release];
 [window release];
 [super dealloc];
}

@end

This controller handles loading / uninstalling a subvisor:

`RootViewController.h`

#import <UIKit/UIKit.h>

@interface RootViewController : UIViewController {
}

- (void) displayView:(int)intNewView;

@end

`RootViewController.m`

#import "RootViewController.h"
#import "ViewController.h"

@implementation RootViewController

UIViewController *currentView;

- (void) displayView:(int)intNewView {
 NSLog(@"%i", intNewView);
 [currentView.view removeFromSuperview];
 [currentView release];
 switch (intNewView) {
  case 1:
   currentView = [[ViewController alloc] initWithNibName:@"View" bundle:nil];
   break;
 }

 [self.view addSubview:currentView.view];
}

- (void)viewDidLoad {
 currentView = [[ViewController alloc]
   initWithNibName:@"View" bundle:nil];
 [self.view addSubview:currentView.view];
 [super viewDidLoad];
}

- (void)dealloc {
 [currentView release];
 [super dealloc];
}

@end

It would be as much caseas the “detail” ViewControllersI have (now I have 3 case, but it will grow to 10 or more). The purpose of this structure is to easily move from one "section" of the application to another (NavBar controller or TabBar controller does not meet my specific needs).

`ViewController.h`

// Generic View Controller Example

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController {
 UIImageView *_image1;
 UIImageView *_image2;
 NSTimer *_theTimer;
}

@property (nonatomic, retain) IBOutlet UIImageView *image1;
@property (nonatomic, retain) IBOutlet UIImageView *image2;
@property (nonatomic, retain) NSTimer *theTimer;

@end

`ViewController.m`

#import "ViewController.h"
#import "MyAppDelegate.h"

@synthesize image1 = _image1, image2 = _image2, theTimer = _theTimer;

- (void)loadMenu {
 [self.theTimer invalidate];
 self.theTimer = nil;
 MyAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
 [appDelegate displayView:2];
} 

-(void)setView:(UIView*)aView {
 if (!aView){
  self.image1 = nil;
  self.image2 = nil;
 }
 [super setView:aView];
}

- (void)viewDidLoad {
 //some code
 [super viewDidLoad];
}

- (void)viewDidUnload {
 self.image1 = nil;
 self.image2 = nil;
}

- (void)dealloc {
 NSLog(@"dealloc called");
 [self.theTimer invalidate];
 [self.theTimer release];
 [self.image1 release];
 [self.image2 release];
 [super dealloc];
}

NSLog dealloc. ( ), , nib, ( , nib).

. , .

Answer 1

.

:

-, , IB, imageNamed. imageNamed , . viewDidLoad initWithContentsOfFile, .

- , imageNamed , .

(, iPhone OS 3.1 )

UIImageView IB, .image. :

- (void)viewDidLoad {
    NSString *path = [NSString stringWithFormat:@"%@/%@", [[NSBundle mainBundle] resourcePath], @"myImageThatBeforeWasAValueinIB.jpg"];
    UIImage *image = [UIImage imageWithContentsOfFile:path];
    outlet.image = image;
    // do the rest of my stuff as it was
    [super viewDidLoad];
}

- (void)dealloc {
    outlet.image = nil;
    [outlet release], outlet = nil;
    [super dealloc];
}

! , .

, IBOutlets UIImageView, - ( ), , IB, , IB . IB . , , , nibs c , , t .

Answer 2

dealloc? setView, viewDidUnload dealloc. , dealloc :

- (void)setView:(UIView *)aView {
    if (!aView) { // view is being set to nil
        // set outlets to nil, e.g.
        self.anOutlet = nil;
    }
    // Invoke super implementation last
    [super setView:aView];
}

- (void)dealloc {
    // release outlets and set outlet variables to nil
    [anOutlet release], anOutlet = nil;
    [super dealloc];
}

: UIImageViews, ,

anOutlet.image = nil;

UIImages UIImages 1.