@property(nonatomic) NSInteger applicationIconBadgeNumber;

- (void)viewDidLoad
{
    [super viewDidLoad];
    //創(chuàng)建并添加一個(gè)按鈕
    UIButton *btn=[[UIButton alloc]initWithFrame:CGRectMake(100, 100, 60, 30)];
    [btn setTitle:@"按鈕" forState:UIControlStateNormal];
    [btn setBackgroundColor:[UIColor brownColor]];
    [btn addTarget:self action:@selector(onClick) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn];
}
-(void)onClick
{
    NSLog(@"按鈕點(diǎn)擊事件");
    //錯(cuò)誤，只能有一個(gè)唯一的UIApplication對(duì)象，不能再進(jìn)行創(chuàng)建
//    UIApplication *app=[[UIApplication alloc]init];
   
    //通過sharedApplication獲取該程序的UIApplication對(duì)象
    UIApplication *app=[UIApplication sharedApplication];
    app.applicationIconBadgeNumber=123;
}

@property(nonatomic,getter=isNetworkActivityIndicatorVisible) BOOL networkActivityIndicatorVisible;

  //設(shè)置指示器的聯(lián)網(wǎng)動(dòng)畫
    app.networkActivityIndicatorVisible=YES;

  - (UIStatusBarStyle)preferredStatusBarStyle;

　-(BOOL)prefersStatusBarHidden;

#pragma mark-設(shè)置狀態(tài)欄的樣式
-(UIStatusBarStyle)preferredStatusBarStyle
{
    //設(shè)置為白色
    //return UIStatusBarStyleLightContent;
    //默認(rèn)為黑色
     return UIStatusBarStyleDefault;
}
#pragma mark-設(shè)置狀態(tài)欄是否隱藏（否）
-(BOOL)prefersStatusBarHidden
{
    return NO;
}

//通過sharedApplication獲取該程序的UIApplication對(duì)象
    UIApplication *app=[UIApplication sharedApplication];
    app.applicationIconBadgeNumber=123;
   
    //設(shè)置指示器的聯(lián)網(wǎng)動(dòng)畫
    app.networkActivityIndicatorVisible=YES;
    //設(shè)置狀態(tài)欄的樣式
    //app.statusBarStyle=UIStatusBarStyleDefault;//默認(rèn)（黑色）
    //設(shè)置為白色+動(dòng)畫效果
      [app setStatusBarStyle:UIStatusBarStyleLightContent animated:YES];
    //設(shè)置狀態(tài)欄是否隱藏
    app.statusBarHidden=YES;
      //設(shè)置狀態(tài)欄是否隱藏+動(dòng)畫效果
    [app setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade];

- (BOOL)openURL:(NSURL*)url;

UIApplication *app = [UIApplicationsharedApplication]; [app openURL:[NSURLURLWithString:@"tel://10086"]];

[app openURL:[NSURLURLWithString:@"sms://10086"]];

[app openURL:[NSURLURLWithString:@"mailto://12345@qq.com"]];

[app openURL:[NSURLURLWithString:@"http://ios.itcast.cn"]];

#import "YYAppDelegate.h"

@implementation YYAppDelegate

// 當(dāng)應(yīng)用程序啟動(dòng)完畢的時(shí)候就會(huì)調(diào)用(系統(tǒng)自動(dòng)調(diào)用)
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    NSLog(@"didFinishLaunchingWithOptions");
    return YES;
}

// 即將失去活動(dòng)狀態(tài)的時(shí)候調(diào)用(失去焦點(diǎn), 不可交互)
- (void)applicationWillResignActive:(UIApplication *)application
{
    NSLog(@"ResignActive");
}

// 重新獲取焦點(diǎn)(能夠和用戶交互)
- (void)applicationDidBecomeActive:(UIApplication *)application
{
    NSLog(@"BecomeActive");
}

// 應(yīng)用程序進(jìn)入后臺(tái)的時(shí)候調(diào)用
// 一般在該方法中保存應(yīng)用程序的數(shù)據(jù), 以及狀態(tài)
- (void)applicationDidEnterBackground:(UIApplication *)application
{
    NSLog(@"Background");
}

// 應(yīng)用程序即將進(jìn)入前臺(tái)的時(shí)候調(diào)用
// 一般在該方法中恢復(fù)應(yīng)用程序的數(shù)據(jù),以及狀態(tài)
- (void)applicationWillEnterForeground:(UIApplication *)application
{
    NSLog(@"Foreground");
}

// 應(yīng)用程序即將被銷毀的時(shí)候會(huì)調(diào)用該方法
// 注意:如果應(yīng)用程序處于掛起狀態(tài)的時(shí)候無法調(diào)用該方法
- (void)applicationWillTerminate:(UIApplication *)application
{
}

// 應(yīng)用程序接收到內(nèi)存警告的時(shí)候就會(huì)調(diào)用
// 一般在該方法中釋放掉不需要的內(nèi)存
- (void)applicationDidReceiveMemoryWarning:(UIApplication *)application
{
    NSLog(@"MemoryWarning");
}
@end

#import <UIKit/UIKit.h>

#import "YYAppDelegate.h"

int main(int argc, char * argv[])
{
    @autoreleasepool {
        // return UIApplicationMain(argc, argv, nil, NSStringFromClass([YYAppDelegate class]));
        // return UIApplicationMain(argc, argv, @"UIApplication", NSStringFromClass([YYAppDelegate class]));
        /*
         argc: 系統(tǒng)或者用戶傳入的參數(shù)個(gè)數(shù)
         argv: 系統(tǒng)或者用戶傳入的實(shí)際參數(shù)
         1.根據(jù)傳入的第三個(gè)參數(shù)創(chuàng)建UIApplication對(duì)象
         2.根據(jù)傳入的第四個(gè)產(chǎn)生創(chuàng)建UIApplication對(duì)象的代理
         3.設(shè)置剛剛創(chuàng)建出來的代理對(duì)象為UIApplication的代理
         4.開啟一個(gè)事件循環(huán)
         */
         return UIApplicationMain(argc, argv, @"UIApplication", @"YYAppDelegate");
    }
}

 YYcarsgroup.h文件代碼：
//
//  YYcarsgroup.h
//  07-汽車展示（高級(jí)）
//
//  Created by apple on 14-5-28.
//  Copyright (c) 2014年 itcase. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface YYcarsgroup : NSObject
@property(nonatomic,copy)NSString *title;
@property(nonatomic,strong)NSArray *cars;

-(instancetype)initWithDict:(NSDictionary *)dict;
+(instancetype)carsgroupWithDict:(NSDictionary *)dict;
@end

//
//  YYcarsgroup.m
//  07-汽車展示（高級(jí)）
//
//  Created by apple on 14-5-28.
//  Copyright (c) 2014年 itcase. All rights reserved.
//

#import "YYcarsgroup.h"
#import "YYcars.h"

@implementation YYcarsgroup
-(instancetype)initWithDict:(NSDictionary *)dict
{
    if (self=[super init]) {
        //嵌套的字典轉(zhuǎn)模型
        self.title=dict[@"title"];
       
        //注意
        NSArray *dictcars=dict[@"cars"];
        //像下面這樣寫可以提高性能
        NSMutableArray *arrayM=[NSMutableArray arrayWithCapacity:dictcars.count];
        for (NSDictionary *dict  in dictcars) {
            YYcars *yycars=[[YYcars alloc]initWithDict:dict];
            [arrayM addObject:yycars];
        }
         // 賦值存儲(chǔ)模型的數(shù)組給屬性
        self.cars=arrayM;
    }
    return self;
}

+(instancetype)carsgroupWithDict:(NSDictionary *)dict
{
    return [[self alloc]initWithDict:dict];
}
@end

//
//  YYcars.h
//  07-汽車展示（高級(jí)）
//
//  Created by apple on 14-5-28.
//  Copyright (c) 2014年 itcase. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface YYcars : NSObject
@property(nonatomic,copy)NSString *name;
@property(nonatomic,copy)NSString *icon;

-(instancetype)initWithDict:(NSDictionary *)dict;
+(instancetype)carsWithDict:(NSDictionary *)dict;
@end

//
//  YYcars.m
//  07-汽車展示（高級(jí)）
//
//  Created by apple on 14-5-28.
//  Copyright (c) 2014年 itcase. All rights reserved.
//

#import "YYcars.h"

@implementation YYcars

-(instancetype)initWithDict:(NSDictionary *)dict
{
    if (self=[super init]) {
        self.name=dict[@"name"];
        self.icon=dict[@"icon"];
    }
    return self;
}
+(instancetype)carsWithDict:(NSDictionary *)dict
{
    return [[self alloc]initWithDict:dict];
}
@end

//
//  YYViewController.m
//  07-汽車展示（高級(jí)）
//
//  Created by apple on 14-5-28.
//  Copyright (c) 2014年 itcase. All rights reserved.
//

#import "YYViewController.h"
#import "YYcarsgroup.h"
#import "YYcars.h"

@interface YYViewController ()<UITableViewDataSource>
@property (strong, nonatomic) IBOutlet UITableView *tableview;
@property(nonatomic,strong) NSArray *car;
@end

@implementation YYViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
   
    self.tableview.rowHeight=60.f;
    self.tableview.dataSource=self;
    NSLog(@"%d",self.car.count);
}
#pragma mark- 實(shí)現(xiàn)懶加載
//1.從包中讀取數(shù)據(jù)
//2.字典轉(zhuǎn)模型
//3.返回cars
-(NSArray *)car
{
    if (_car==nil) {
     
        NSString *fullpath= [[NSBundle mainBundle]pathForResource:@"cars_total.plist" ofType:nil];
        NSArray  *arrayM=[NSArray arrayWithContentsOfFile:fullpath];
       
        NSMutableArray *carsarray=[NSMutableArray array];
        for (NSDictionary  *dict in arrayM) {
            YYcarsgroup *carsgroup=[YYcarsgroup carsgroupWithDict:dict];
            [carsarray addObject:carsgroup];
        }
        _car=[carsarray copy];
    }
    return _car;
}

#pragma mark-  實(shí)現(xiàn)tableview的數(shù)據(jù)展示
//1.設(shè)置數(shù)據(jù)源，遵守協(xié)議
//2.返回組
//3.返回行
//4.每組每行對(duì)應(yīng)的數(shù)據(jù)
//4.1去緩存中去取cell
//4.2若沒有，則創(chuàng)建cell,并蓋章
//4.3設(shè)置cell的數(shù)據(jù)
//4.4返回cell

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return self.car.count;
}
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    YYcarsgroup *carsgroup=self.car[section];
    return carsgroup.cars.count;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *identifier=@"car";
    //4.1去緩存中去取cell
    UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:identifier];
    //4.2若沒有，則創(chuàng)建cell,并蓋章
    if (cell==nil) {
        cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
    }
    //4.3設(shè)置cell的數(shù)據(jù)
    //設(shè)置對(duì)應(yīng)的組
    YYcarsgroup *carsgroup=self.car[indexPath.section];
    //設(shè)置對(duì)應(yīng)的行
    YYcars *yycars=carsgroup.cars[indexPath.row];

    cell.imageView.image=[UIImage imageNamed:yycars.icon];
    cell.textLabel.text=yycars.name;
    //4.4返回cell
    return cell;
}

//設(shè)置每組的標(biāo)題
-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    YYcarsgroup *carsgroup=self.car[section];
    return carsgroup.title;
}

//設(shè)置索引
-(NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView
{
    //利用kvc取出所有的標(biāo)題
    NSArray *title=[self.car  valueForKeyPath:@"title"];
    return title;
}

//隱藏狀態(tài)欄
-(BOOL)prefersStatusBarHidden
{
    return  YES;
}
@end

//設(shè)置索引
-(NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView
{
    //利用kvc取出所有的標(biāo)題
    NSArray *title=[self.car  valueForKeyPath:@"title"];
    return title;
}

static NSString *identifier=@"car";
    //4.1去緩存中去取cell
    UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:identifier];
    //4.2若沒有，則創(chuàng)建cell,并蓋章
    if (cell==nil) {
        cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
    }