//Singleton.h
@interface Singleton : NSObject
+ (Singleton *)sharedSingleton; <1>
@end
 
/***************************************************************/
 
//Singleton.m
#import "Singleton.h"
@implementation Singleton   
static Singleton *sharedSingleton = nil;<2>
 
+ (Singleton *)sharedSingleton{
    static dispatch_once_t once;<3>
    dispatch_once(&once,^{
        sharedSingleton = [[self alloc] init];<4>
        //dosometing
    });
    return sharedSingleton;<5>
}

//StudentDAO.h
@interface StudentDAO:NSObject
@property (nonatomic,strong) NSMutaleArray *StudentsInfo;
 
+ (StudentDAO *)sharedStudentDAO;
 
-(int) create:(Student*)student;
-(int) remove:(Student*)student;
-(int) modify:(Student*)student;
-(NSMutaleArray) findAll;
@end

//StudentDAO.m
#import "StudentDAO.h"
#import "Student.h"
@implementation StudentDAO
 
static StudentDAO *studentDao = nil;
+ (StudentDAO)sharedStudentDAO{
    static dispatch_once_t once;
    dispatch_once(&once,^{
        Student  *student1 = [[Student alloc]init];
        student1.name = "MexiQQ";
        student1.studentNum = "201200301101";
 
        Student  *student2 = [[Student alloc]init];
        student2.name = "Ricardo_LI";
        student2.studentNum = "201200301102";
 
        studentDao = [[self alloc] init];
        studentDao._StudentsInfo = [[NSMutaleArray alloc]init];
        [studentDao._StudentsInfo addObject:student1];
        [studentDao._StudentsInfo addObject:student2];
    });
    return studentDao;
}   
//插入的方法
-(int)create:(Student*)stu{
    [self._StudentsInfo addObject:stu];
    return 0;
}   
//删除的方法
-(int)remove:(Student*)stu{
    for(Student* s in self._StudentsInfo){
        if([stu.studentNum isEqual:s.studentNum]){
            [self._StudentsInfo removeObject:s]
            break;
        }
    }
}
-(int)modify...... //省略不写
-(NSMutaleArray)findAll...... //省略不写

- (void)applicationDidEnterBackground:(UIApplication *)application {
    [[NSNotificationCenter defaultCenter]postNotificationName:@"APPTerminate" object:self];
}

//
//  ViewController.m
//  TestNotification
//
//  Created by liwenqian on 14-10-18.
//  Copyright (c) 2014年 liwenqian. All rights reserved.
//
 
#import "ViewController.h"
 
@interface ViewController ()
 
@end
 
@implementation ViewController
 
- (void)viewDidLoad {
    [super viewDidLoad];
    //注意此处的selector有参数，要加冒号
    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(doSomething:) name:@"APPTerminate" object:nil];
    // Do any additional setup after loading the view, typically from a nib.
}
 
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    [[NSNotificationCenter defaultCenter]removeObserver:self];
    // Dispose of any resources that can be recreated.
}
 
#pragma mark -处理通知
-(void)doSomething:(NSNotification*)notification{
    NSLog(@"收到通知");
}
 
@end

//
//  AppDelegate.h
//  TestNotification
//
//  Created by liwenqian on 14-10-18.
//  Copyright (c) 2014年 liwenqian. All rights reserved.
//
 
#import <UIKit/UIKit.h>
#import <CoreData/CoreData.h>
#import "TestWatche.h"
 
@interface AppDelegate : UIResponder <UIApplicationDelegate>
 
@property (strong, nonatomic) UIWindow *window;
 
@property (readonly, strong, nonatomic) NSManagedObjectContext *managedObjectContext;
@property (readonly, strong, nonatomic) NSManagedObjectModel *managedObjectModel;
@property (readonly, strong, nonatomic) NSPersistentStoreCoordinator *persistentStoreCoordinator;
@property (strong,nonatomic) NSString *state;
@property (strong,nonatomic) TestWatche *watcher;
 
 
- (void)saveContext;
- (NSURL *)applicationDocumentsDirectory;
 
 
@end

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)
launchOptions {    // Override point for customization after application launch.
 
    self.watcher = [TestWatche alloc];
 
    [self addObserver:self.watcher forKeyPath:@"state" options:NSKeyValueObservingOptionOld |
 NSKeyValueObservingOptionNew context:@"pass content"];    self.state = @"launch";    return YES;
}
 
- (void)applicationDidEnterBackground:(UIApplication *)application {    self.state = @"backgroud";
}

//
//  TestWatche.m
//  TestNotification
//
//  Created by liwenqian on 14-10-18.
//  Copyright (c) 2014年 liwenqian. All rights reserved.
//
 
#import "TestWatche.h"
 
@implementation TestWatche
 
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{
    NSLog(@"state change:%@",change);
}
@end

//
//  ViewController.h
//  RecipeBookMe
//
//  Created by liwenqian on 14-9-10.
//  Copyright (c) 2014年 liwenqian. All rights reserved.
//
 
#import <UIKit/UIKit.h>
 
@interface ViewController : UIViewController <UITableViewDelegate, UITableViewDataSource>
 
@property (nonatomic, strong) IBOutlet UITableView *mytableView;
 
@end

//
//  ViewController.m
//  RecipeBookMe
//
//  Created by liwenqian on 14-9-10.
//  Copyright (c) 2014年 liwenqian. All rights reserved.
//
 
#import "ViewController.h"
#import "DetailViewController.h"
#import "Recipe.h"
#import "RecipeTableCellTableViewCell.h"
 
@interface ViewController ()
 
@end
 
@implementation ViewController{
     NSArray *recipes;      
}
 
@synthesize mytableView;
 
- (void)viewDidLoad {
    [super viewDidLoad];
 
    // Initialize the recipes array
    Recipe *recipe1 = [Recipe new];
 
    recipe1.name = @"Egg Benedict";
    recipe1.prepTime = @"30 min";
    recipe1.image = @"egg_benedict.jpg";
    recipe1.ingredients = [NSArray arrayWithObjects:@"2 fresh English muffins", @"4 eggs", 
@"4 rashers of back bacon", @"2 egg yolks", @"1 tbsp of lemon juice", @"125 g of butter", @"salt and pepper", nil];
 
    Recipe *recipe2 = [Recipe new];
    recipe2.name = @"Mushroom Risotto";
    recipe2.prepTime = @"30 min";
    recipe2.image = @"mushroom_risotto.jpg";
    recipe2.ingredients = [NSArray arrayWithObjects:@"1 tbsp dried porcini mushrooms",
 @"2 tbsp olive oil", @"1 onion, chopped", @"2 garlic cloves", @"350g/12oz arborio rice",
 @"1.2 litres/2 pints hot vegetable stock", @"salt and pepper", @"25g/1oz butter", nil]; 
 
    recipes = [NSArray arrayWithObjects:recipe1, recipe2, nil];
 
}
 
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}
 
/*--------------------------------------------------------------------*/
//定义UITableview的栏目数量
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
     return [recipes count];
}
 
//定义UITableviewCell的显示内容
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CoustomerTableIdentifier = @"RecipeTableCellTableViewCell";
 
    RecipeTableCellTableViewCell *cell =(RecipeTableCellTableViewCell *)
 [tableView dequeueReusableCellWithIdentifier:CoustomerTableIdentifier];
 
    if (cell == nil) {
       cell = [[RecipeTableCellTableViewCell alloc] initWithStyle:
UITableViewCellStyleDefault reuseIdentifier:CoustomerTableIdentifier];
    }
 
    recipe = [recipes objectAtIndex:indexPath.row];
 
    cell.nameLabel.text =  recipe.name;
    cell.prepTimeLabel.text= recipe.prepTime;
    cell.thumbnailImageView.image = [UIImage imageNamed:recipe.image];
 
    return cell;
}
 
//点击每一栏执行跳转时的处理
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([segue.identifier isEqualToString:@"showRecipeDetail"]) {
 
        NSIndexPath *indexPath = nil;
        Recipe *recipe = nil;
 
        indexPath = [self.mytableView indexPathForSelectedRow];
        recipe = [recipes objectAtIndex:indexPath.row];
 
        DetailViewController *destViewController = segue.destinationViewController;
        destViewController.recipe = [recipes objectAtIndex:indexPath.row];
    }
}
 
//定义cell的高度
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 71;
}
/*--------------------------------------------------------------------*/
@end