#import "JXItemsViewController.h"
@interface JXItemsViewController ()
@end
@implementation JXItemsViewController
- (instancetype)init {
// 調(diào)用父類的指定初始化方法
self = [super initWithStyle:UITableViewStylePlain];
return self;
}
- (instancetype)initWithStyle:(UITableViewStyle)style {
return [self init];
}
@end

#import "AppDelegate.h"
#import "JXItemsViewController.h"
@interface AppDelegate ()
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
// 添加初始化代碼
// 創(chuàng)建 JXItemsViewController 對(duì)象
JXItemsViewController * itemsViewController = [[JXItemsViewController alloc] init];
// 將 JXItemsViewController 的標(biāo)示圖加入窗口
self.window.rootViewController = itemsViewController;
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}

#import <Foundation/Foundation.h>
@interface JXItem : NSObject
/** 創(chuàng)建日期 */
@property (nonatomic,strong,readonly) NSDate * createDate;
/** 名稱 */
@property (nonatomic,strong) NSString * itemName;
/** 編號(hào) */
@property (nonatomic,strong) NSString * serialnumber;
/** 價(jià)值 */
@property (nonatomic,assign) NSInteger valueInDollars;
/** JXImageStore中的鍵 */
@property (nonatomic,strong) NSString * itemKey;
+ (instancetype)randomItem;
/**
* JXItem類指定的初始化方法
* @return 類對(duì)象
*/
- (instancetype)initWithItemName:(NSString *)name
valueInDollars:(NSInteger)value
serialNumber:(NSString *)sNumber;
- (instancetype)initWithItemName:(NSString *)name;
@end
#import "JXItem.h"
@implementation JXItem
+ (instancetype)randomItem {
// 創(chuàng)建不可變數(shù)組對(duì)象，包含三個(gè)形容詞
NSArray * randomAdjectiveList = @[
@"Fluffy",
@"Rusty",
@"Shiny"
];
// 創(chuàng)建不可變數(shù)組對(duì)象，包含三個(gè)名詞
NSArray * randomNounList = @[
@"Bear",
@"Spork",
@"Mac"
];
// 根據(jù)數(shù)組對(duì)象所含的對(duì)象的個(gè)數(shù)，得到隨機(jī)索引
// 注意：運(yùn)算符%是模運(yùn)算符，運(yùn)算后得到的是余數(shù)
NSInteger adjectiveIndex = arc4random() % randomAdjectiveList.count;
NSInteger nounIndex = arc4random() % randomNounList.count;
// 注意，類型為NSInteger 的變量不是對(duì)象
NSString * randomName = [NSString stringWithFormat:@"%@ %@",randomAdjectiveList[adjectiveIndex],randomNounList[nounIndex]];
NSInteger randomValue = arc4random_uniform(100);
NSString * randomSerialNumber = [NSString stringWithFormat:@"%c%c%c%c",
'0' + arc4random_uniform(10),
'A' + arc4random_uniform(26),
'0' + arc4random_uniform(10),
'A' + arc4random_uniform(26)];
JXItem * newItem = [[self alloc] initWithItemName:randomName
valueInDollars:randomValue
serialNumber:randomSerialNumber];
return newItem;
}
- (NSString *)description {
NSString * descriptionString = [NSString stringWithFormat:@"%@ (%@):Worth $%zd, recorded on %@",self.itemName,self.serialnumber,self.valueInDollars,self.createDate];
return descriptionString;
}
- (instancetype)initWithItemName:(NSString *)name
valueInDollars:(NSInteger)value
serialNumber:(NSString *)sNumber {
// 調(diào)用父類的指定初始化方法
self = [super init];
// 父類的指定初始化方法是否成功創(chuàng)建了對(duì)象
if (self) {
// 為實(shí)例變量設(shè)置初始值
_itemName = name;
_valueInDollars = value;
_serialnumber = sNumber;
// 設(shè)置_createDate為當(dāng)前時(shí)間
_createDate = [NSDate date];
// 創(chuàng)建一個(gè) NSUUID 對(duì)象
NSUUID * uuid = [[NSUUID alloc] init];
NSString * key = [uuid UUIDString];
_itemKey = key;
}
// 返回初始化后的對(duì)象的新地址
return self;
}
- (instancetype)initWithItemName:(NSString *)name {
return [self initWithItemName:name valueInDollars:0 serialNumber:@""];
}
- (instancetype)init {
return [self initWithItemName:@"Item"];
}
- (void)dealloc {
NSLog(@"Destoryed:%@",self);
}
@end

#import <Foundation/Foundation.h>
@interface JXItemStore : NSObject
// 注意，這是一個(gè)類方法，前綴是+
+ (instancetype)sharedStore;
@end 
　　在 JXItemStore 類收到 sharedStore 消息后，會(huì)檢查自己是否已經(jīng)創(chuàng)建 JXItemStore 的單例對(duì)象。如果已經(jīng)創(chuàng)建，就返回自己已經(jīng)創(chuàng)建的對(duì)象，否則就需要先創(chuàng)建，然后再返回。
#import "JXItemStore.h"
@implementation JXItemStore
// 單粒對(duì)象
+ (instancetype)sharedStore {
static JXItemStore * sharedStore = nil;
// 判斷是否需要?jiǎng)?chuàng)建一個(gè) sharedStore 對(duì)象
if (!sharedStore) {
sharedStore = [[self alloc] init];
}
return sharedStore;
}
@end

#import <Foundation/Foundation.h>
@class JXItem;
@interface JXItemStore : NSObject
/** 存放 JXItem 對(duì)象數(shù)組 */
@property (nonatomic,readonly) NSArray * allItem;
// 注意，這是一個(gè)類方法，前綴是+
+ (instancetype)sharedStore;
- (JXItem *)createItem;
@end 

#import "JXItemStore.h"
#import "JXItem.h"
@interface JXItemStore ()
/** 可變數(shù)組，用來(lái)操作 JXItem 對(duì)象 */
@property (nonatomic,strong) NSMutableArray * privateItems;
@end
@implementation JXItemStore
// 單粒對(duì)象
+ (instancetype)sharedStore {
static JXItemStore * sharedStore = nil;
// 判斷是否需要?jiǎng)?chuàng)建一個(gè) sharedStore 對(duì)象
if (!sharedStore) {
sharedStore = [[self alloc] init];
}
return sharedStore;
}
- (NSArray *)allItem {
return self.privateItems;
}
#pragma mark - 懶加載
- (NSMutableArray *)privateItems{
if (_privateItems == nil) {
_privateItems = [[NSMutableArray alloc] init];
}
return _privateItems;
}
@end

#import "JXItemStore.h"
#import "JXItem.h"
@interface JXItemStore ()
/** 可變數(shù)組，用來(lái)操作 JXItem 對(duì)象 */
@property (nonatomic,strong) NSMutableArray * privateItems;
@end
@implementation JXItemStore
// 單粒對(duì)象
+ (instancetype)sharedStore {
static JXItemStore * sharedStore = nil;
// 判斷是否需要?jiǎng)?chuàng)建一個(gè) sharedStore 對(duì)象
if (!sharedStore) {
sharedStore = [[self alloc] init];
}
return sharedStore;
}
- (NSArray *)allItem {
return [self.privateItems copy];
}
- (JXItem *)createItem {
JXItem * item = [JXItem randomItem];
[self.privateItems addObject:item];
return item;
}
#pragma mark - 懶加載
- (NSMutableArray *)privateItems{
if (_privateItems == nil) {
_privateItems = [[NSMutableArray alloc] init];
}
return _privateItems;
}
@end

#import "JXItemsViewController.h"
#import "JXItem.h"
#import "JXItemStore.h"
@interface JXItemsViewController ()
@end
@implementation JXItemsViewController
- (instancetype)init {
// 調(diào)用父類的指定初始化方法
self = [super initWithStyle:UITableViewStylePlain];
if (self) {
for (NSInteger i=0; i<5; i++) {
[[JXItemStore sharedStore] createItem];
}
}
return self;
}
- (instancetype)initWithStyle:(UITableViewStyle)style {
return [self init];
}
@end

@required
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section;
// Row display. Implementers should *always* try to reuse cells by setting each cell's reuseIdentifier and querying for available reusable cells with dequeueReusableCellWithIdentifier:
// Cell gets various attributes set automatically based on table (separators) and data source (accessory views, editing controls)
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
@optional
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView; // Default is 1 if not implemented
- (nullable NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section; // fixed font style. use custom view (UILabel) if you want something different
- (nullable NSString *)tableView:(UITableView *)tableView titleForFooterInSection:(NSInteger)section;
// Editing
// Individual rows can opt out of having the -editing property set for them. If not implemented, all rows are assumed to be editable.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath;
// Moving/reordering
// Allows the reorder accessory view to optionally be shown for a particular row. By default, the reorder control will be shown only if the datasource implements -tableView:moveRowAtIndexPath:toIndexPath:
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath;
// Index
- (nullable NSArray<NSString *> *)sectionIndexTitlesForTableView:(UITableView *)tableView __TVOS_PROHIBITED; // return list of section titles to display in section index view (e.g. "ABCD...Z#")
- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index __TVOS_PROHIBITED; // tell table which section corresponds to section title/index (e.g. "B",1))
// Data manipulation - insert and delete support
// After a row has the minus or plus button invoked (based on the UITableViewCellEditingStyle for the cell), the dataSource must commit the change
// Not called for edit actions using UITableViewRowAction - the action's handler will be invoked instead
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath;
// Data manipulation - reorder / moving support
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath;
@end

#import "JXItemsViewController.h"
#import "JXItem.h"
#import "JXItemStore.h"
@interface JXItemsViewController ()
@end
@implementation JXItemsViewController
- (instancetype)init {
// 調(diào)用父類的指定初始化方法
self = [super initWithStyle:UITableViewStylePlain];
if (self) {
for (NSInteger i=0; i<5; i++) {
[[JXItemStore sharedStore] createItem];
}
}
return self;
}
- (instancetype)initWithStyle:(UITableViewStyle)style {
return [self init];
}
- (void)viewDidLoad {
[super viewDidLoad];
}
#pragma mark - Table view data source
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [[[JXItemStore sharedStore] allItem] count];
}
@end

typedef NS_ENUM(NSInteger, UITableViewCellStyle) {
UITableViewCellStyleDefault, // Simple cell with text label and optional image view (behavior of UITableViewCell in iPhoneOS 2.x)
UITableViewCellStyleValue1, // Left aligned label on left and right aligned label on right with blue text (Used in Settings)
UITableViewCellStyleValue2, // Right aligned label on left with blue text and left aligned label on right (Used in Phone/Contacts)
UITableViewCellStyleSubtitle // Left aligned label on top and left aligned label on bottom with gray text (Used in iPod).
}; // available in iPhone OS 3.0

#import "JXItemsViewController.h"
#import "JXItem.h"
#import "JXItemStore.h"
@interface JXItemsViewController ()
@end
@implementation JXItemsViewController
- (instancetype)init {
// 調(diào)用父類的指定初始化方法
self = [super initWithStyle:UITableViewStylePlain];
if (self) {
for (NSInteger i=0; i<15; i++) {
[[JXItemStore sharedStore] createItem];
}
}
return self;
}
- (instancetype)initWithStyle:(UITableViewStyle)style {
return [self init];
}
- (void)viewDidLoad {
[super viewDidLoad];
}
#pragma mark - Table view data source
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [[[JXItemStore sharedStore] allItem] count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
// 創(chuàng)建 UITableViewCell 對(duì)象，風(fēng)格使用默認(rèn)風(fēng)格
UITableViewCell * cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:@"UITableViewCell"];
// 獲取 allItem 的第 n 個(gè) JXItem 對(duì)象
// 然后將該 JXItem 對(duì)象的描述信息賦值給 UITableViewCell 對(duì)象的 textLabel
// 這里的 n 是該 UITableViewCell 對(duì)象所對(duì)應(yīng)的表格索引
NSArray * items = [[JXItemStore sharedStore] allItem];
JXItem * item = items[indexPath.row];
cell.textLabel.text = [item description];
return cell;
}
@end

#import "JXItemsViewController.h"
#import "JXItem.h"
#import "JXItemStore.h"
@interface JXItemsViewController ()
@end
@implementation JXItemsViewController
- (instancetype)init {
// 調(diào)用父類的指定初始化方法
self = [super initWithStyle:UITableViewStylePlain];
if (self) {
for (NSInteger i=0; i<15; i++) {
[[JXItemStore sharedStore] createItem];
}
}
return self;
}
- (instancetype)initWithStyle:(UITableViewStyle)style {
return [self init];
}
- (void)viewDidLoad {
[super viewDidLoad];
// 向控制器注冊(cè)
[self.tableView registerClass:[UITableViewCell class]
forCellReuseIdentifier:@"UITableViewCell"];
}
#pragma mark - Table view data source
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [[[JXItemStore sharedStore] allItem] count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
// 創(chuàng)建 UITableViewCell 對(duì)象，風(fēng)格使用默認(rèn)風(fēng)格
UITableViewCell * cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:@"UITableViewCell"];
UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:@"UITableViewCell"
forIndexPath:indexPath];
// 獲取 allItem 的第 n 個(gè) JXItem 對(duì)象
// 然后將該 JXItem 對(duì)象的描述信息賦值給 UITableViewCell 對(duì)象的 textLabel
// 這里的 n 是該 UITableViewCell 對(duì)象所對(duì)應(yīng)的表格索引
NSArray * items = [[JXItemStore sharedStore] allItem];
JXItem * item = items[indexPath.row];
cell.textLabel.text = [item description];
return cell;
}
@end