//

//  ObjectDetector.h

//  ARCBlock

//

//  Copyright (c) 2014年 Y.X. All rights reserved.

//

#import <Foundation/Foundation.h>

@interface ObjectDetector : NSObject

+ (void)startWatch;

+ (void)addToWatch:(id)object;

+ (NSArray *)allObjects;

@end

//

//  ObjectDetector.m

//  ARCBlock

//

//  Copyright (c) 2014年 Y.X. All rights reserved.

//

#import "ObjectDetector.h"

#ifndef GCDExecOnce

#define GCDExecOnce(block) \

{ \

static dispatch_once_t predicate = ; \

dispatch_once(&predicate, block); \

}

#endif

static NSHashTable        *_table          = nil;

static dispatch_source_t   _dispatchSource = nil;

static dispatch_queue_t    _dispatchQueue  = nil;

@implementation ObjectDetector

+ (void)initialize

{

    if (self == [ObjectDetector class])

    {

        _table          = [NSHashTable weakObjectsHashTable];

        _dispatchQueue  = dispatch_queue_create(nil, DISPATCH_QUEUE_CONCURRENT);

        _dispatchSource = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, , , _dispatchQueue);

        dispatch_source_set_timer(_dispatchSource,

                                  dispatch_time(DISPATCH_TIME_NOW, ),

                                  NSEC_PER_SEC,

                                  );

        dispatch_source_set_event_handler(_dispatchSource, ^{

            NSLog(@"\n[==ObjectDetector LIST==]\n%@", _table);

        });

    }

}

+ (void)startWatch

{

    GCDExecOnce(^{

        dispatch_resume(_dispatchSource);

    });

}

+ (void)addToWatch:(id)object

{

    if (object == nil)

    {

        NSLog(@"object should not be nil.");

        return;

    }

    if ([_table containsObject:object] == NO)

    {

        [_table addObject:object];

    }

}

+ (NSArray *)allObjects

{

    return [_table allObjects];

}

@end

//

//  Prefix header

//

//  The contents of this file are implicitly included at the beginning of every source file.

//

#import <Availability.h>

#ifndef __IPHONE_3_0

#warning "This project uses features only available in iOS SDK 3.0 and later."

#endif

#ifdef __OBJC__

    #import <UIKit/UIKit.h>

    #import <Foundation/Foundation.h>

    #import "ObjectDetector.h"

#endif

//

//  AppDelegate.m

//  NSHashTable

//

//  Copyright (c) 2014年 Y.X. All rights reserved.

//

#import "AppDelegate.h"

#import "RootViewController.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    // Override point for customization after application launch.

    UINavigationController *NC = \

        [[UINavigationController alloc] initWithRootViewController:[RootViewController new]];

    self.window.rootViewController = NC;

    // 开始检测

    [ObjectDetector startWatch];

    self.window.backgroundColor = [UIColor whiteColor];

    [self.window makeKeyAndVisible];

    return YES;

}

@end

//

//  RootViewController.m

//  NSHashTable

//

//  Copyright (c) 2014年 Y.X. All rights reserved.

//

#import "RootViewController.h"

#import "SecondViewController.h"

@interface RootViewController ()

@end

@implementation RootViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

    self.title               = @"任重而道远";

    UIButton *button         = [[UIButton alloc] initWithFrame:CGRectMake(, , , )];

    button.center            = self.view.center;

    button.layer.borderWidth = .f;

    button.titleLabel.font   = [UIFont fontWithName:@"HelveticaNeue-UltraLight"

                                               size:.f];

    [button setTitle:@"YouXianMing" forState:UIControlStateNormal];

    [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

    [button addTarget:self

               action:@selector(buttonEvent:)

     forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:button];

}

- (void)buttonEvent:(UIButton *)button

{

    [self.navigationController pushViewController:[SecondViewController new]

                                         animated:YES];

}

@end

//

//  SecondViewController.m

//  NSHashTable

//

//  Copyright (c) 2014年 Y.X. All rights reserved.

//

#import "SecondViewController.h"

@interface SecondViewController ()

@end

@implementation SecondViewController

- (void)viewDidLoad

{

    [super viewDidLoad];

    self.view.backgroundColor = [UIColor whiteColor];

    self.title                = @"天道酬勤";

    // 添加检测对象

    [ObjectDetector addToWatch:self];

}

@end