@interface FKDiary : UIDocument

@property (nonatomic,strong) NSData         *diaryData;

@property (nonatomic,copy) NSString       *fileURL;

@end

#import "FKDiary.h"

@implementation FKDiary

//保存该对象时自动调用该方法

-(id)contentsForType:(NSString *)typeName error:(NSError *__autoreleasing *)outError

{

    NSLog(@"保存文件到URl %@!",self.fileURL);

    if (self.diaryData == nil) {

        return  [[NSData alloc]init];

    }

    //将diaryData作为放回值,程序将会把该返回值保存到云端

    return [self.diaryData copy];

}

//读取该对象时自动调用该方法

-(BOOL)loadFromContents:(id)contents ofType:(NSString *)typeName error:(NSError *__autoreleasing *)outError

{

    NSLog(@"从云端下载的数据为:%@",contents);

    //将从云端下载得到的数据赋给diaryData数据

    self.diaryData = [contents mutableCopy];

    return true;

}

#import "FKDiary.h"

#import "ViewController.h"

@interface FKMasterController ()<UIAlertViewDelegate>

{

    //定义导航栏左边的按钮

    UIBarButtonItem *deleteButton;

}

@property (strong,nonatomic)NSMetadataQuery      *query;

@property (strong,nonatomic)NSMutableArray       *documentFilenames;

@property (strong,nonatomic)NSMutableArray       *documentURLs;

@property (strong,nonatomic)FKDiary              *chosenDiary;

@end

@implementation FKMasterController

- (void)viewDidLoad {

    [super viewDidLoad];

    //创建导航栏邮编的按钮

    UIBarButtonItem *addButton = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(addDiary)];

    //将导航栏按钮设置为导航栏的右边按钮

    self.navigationItem.rightBarButtonItem = addButton;

    //创建导航栏左边的按钮

    deleteButton = [[UIBarButtonItem alloc]initWithTitle:@"删除" style:UIBarButtonItemStylePlain target:self action:@selector(deleteDiary)];

    //创建导航栏左边的按niu

    self.navigationItem.leftBarButtonItem = deleteButton;

    //调用reloadFiles从云端下载文件

    [self reloadFiles];

}

-(void)addDiary

{

    //使用UIAlertView来获取文件名字

    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"输入日记名" message:@"输入日记名称" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"创建", nil];

    //设置该UIAlertView的风格为带输入框的UIAlertView

    alert.alertViewStyle = UIAlertViewStylePlainTextInput;

    [alert show];

}

-(NSURL *)urlForFilename:(NSString *)filename

{

    //获取默认的NSFileManager对象

    NSFileManager *fileManager = [NSFileManager defaultManager];

    //根据Identifier获取系统的Ubiquity Container

    //如果传入nil参数,则默认获取第一个Ubiquity Container

    NSURL *baseURL = [fileManager URLForUbiquityContainerIdentifier:nil];

    //获取云端Ubiquity Container的Documents子目录

    NSURL *pathURL = [baseURL URLByAppendingPathComponent:@"Documents"];

    //在Documents子目录下添加文件名,作为保存文件的URL

    NSURL *destinationURL = [pathURL URLByAppendingPathComponent:filename];

    return  destinationURL;

}

-(void)reloadFiles

{

    //创建一个NSMetataQuery对象

    self.query = [[NSMetadataQuery alloc]init];

    //设置查询谓词

    self.query.predicate = [NSPredicate predicateWithFormat:@"%K like '*.diary'",NSMetadataItemFSNameKey];

    //设置查询范围,此处指定查询范围为NSMetadataQueryUbiquitousDocumentsScope

//    即在云端的Documents目录下查询

    self.query.searchScopes = [NSArray arrayWithObject:NSMetadataQueryUbiquitousDataScope];

    //获取数据结束时激发updateUbiquitousDocuments方法

    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(updateUbiquitousDocuments:) name:NSMetadataQueryDidFinishGatheringNotification object:nil];

    //查询更新完成时激发updateUbiquitousDocuments方法

    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(updateUbiquitousDocuments:) name:NSMetadataQueryDidUpdateNotification object:nil];

    //开始查询

    [self.query startQuery];

}

-(void)updateUbiquitousDocuments:(NSNotification *)notification

{

    self.documentURLs = [NSMutableArray array];

    self.documentFilenames = [NSMutableArray array];

    //对查询结果进行排序,排序所使用的比较标准是创建时间

    NSArray *results = [self.query.results sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {

        NSMetadataItem *item1 = obj1;

        NSMetadataItem *item2 = obj2;

        //比较两个NSMetadataItem的时间

        return  [[item2 valueForAttribute:NSMetadataItemFSCreationDateKey] compare:[item1 valueForAttribute:NSMetadataItemFSCreationDateKey]];

    }];

    //遍历查询结果

    for (NSMetadataItem *item in results) {

        //查询结果中包含的NSURL属性

        NSURL *url = [item valueForAttribute: NSMetadataItemURLKey];

        //将NSURL添加到documentURLs集合中

        [self.documentURLs addObject:url];

        //将NSURL的最后一个路径(文件名)添加到documentfilenames集合中

        [self.documentFilenames addObject:url];

    }

    //控制界面上表哥重新加载数据

    [self.tableView reloadData];

}

-(void)perpareForSegue:(UIStoryboardSegue *)segue sender:(id)sender

{

    //如果sender等于self,则表明是新建FKDiary后导航到查看,编辑日记的视图空孩子气

    if (sender == self) {

        UIViewController *destination = segue.destinationViewController;

        //将用户新建的FKDiary对象传给目标视图控制器

        if ([destination respondsToSelector:@selector(setDetailItem:)])

        {

            [destination setValue:self.chosenDiary forKey:@"detailItem"];

        }

    }else

    {

        //获取激发视图切换的单元格所在的NSIndexPath

        NSIndexPath *indexPath = [self.tableView indexPathForCell:sender];

        //获取激发视图切换的单元格中显示的文件名

        NSString *filename = [self.documentFilenames objectAtIndex:indexPath.row];

        //获取该文件名对应的FKDiary的存储URL

        NSURL *docURl = [self urlForFilename:filename];

        //以指定的docUrl创建FKDiary对象

        self.chosenDiary = [[FKDiary alloc]initWithFileURL:docURl];

        //读取chosenDiary文档

        [self.chosenDiary openWithCompletionHandler:^(BOOL success) {

           //如果读取成功

            if (success) {

                ViewController *destination = (ViewController *)segue.destinationViewController;

                //将读取成功的chosenDiary传给destination

                destination.detailItem = self.chosenDiary;

                //调用destination的changeDisplay更新显示

                [destination changeDisplay];

            }

            else

            {

                NSLog(@"failed to load!");

            }

        }];

    }

}

-(void)deleteDiary

{

    //使用动画切换表格的编辑状态

    [self.tableView setEditing: !self.tableView.editing animated:YES];

    //修改deleteButton按钮的文本

    deleteButton.title = [deleteButton.title isEqualToString:@"删除"]?@"完成":@"删除";

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {

    // Return the number of sections.

    return 1;

}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

    // Return the number of rows in the section.

    return [self.documentFilenames count];

}

#pragma mark - UIAlertViewDelegate

-(void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex

{

    if (buttonIndex == 1) {

        //获取用户zaiUIAlerView中输入的文件名,并添加.diary扩展名

        NSString *filename = [NSString stringWithFormat:@"%@.diary",[alertView textFieldAtIndex:0].text];

        //获取云端文档存储的url

        NSURL *saveURL = [self urlForFilename:filename];

        //创建一个fKDiary (UIDocument的子类)对象

        self.chosenDiary = [[FKDiary alloc]initWithFileURL:saveURL];

        //保存chosenDiary文档

        [self.chosenDiary saveToURL:saveURL forSaveOperation:UIDocumentSaveForCreating completionHandler:^(BOOL success) {

            if(success)

            {

                NSLog(@"保存成功");

                [self reloadFiles];

                //执行masterTodetail segue,导航到查看,编辑日记的视图控制器

                [self performSegueWithIdentifier:@"masterToDetail" sender:self];

            }else

            {

                NSLog(@"保存失败");

            }

        }];

    }

}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cellID" forIndexPath:indexPath];

    //根据单元格所在的行号获取对应的文档名

    NSString *path = [self.documentFilenames objectAtIndex:indexPath.row];

    //设置该单元格的文本为文档名取消后缀

    cell.textLabel.text = path.lastPathComponent.stringByDeletingPathExtension;

    // Configure the cell...

    return cell;

}

- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath

{

    //返回UITableViewCellEditingStyleDeleter代表删除

    return UITableViewCellEditingStyleDelete;

}

/*

// Override to support conditional editing of the table view.

- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {

    // Return NO if you do not want the specified item to be editable.

    return YES;

}

*/

// Override to support editing the table view.

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {

    if (editingStyle == UITableViewCellEditingStyleDelete) {

        // Delete the row from the data source

        //获取用户视图删除的行号

        NSInteger rowNo = [indexPath row];

        //调用NSfileMangaer的removeItemAtURL:error:方法即可删除云端文档

        [[NSFileManager defaultManager]removeItemAtURL:[self.documentURLs objectAtIndex:rowNo] error:nil];

        //从底层NSArray集合中删除指定数据项

        [self.documentFilenames removeObjectAtIndex:rowNo];

        //从UITableView程序界面删删除指定表格行

        [self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];

        [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];

    } else if (editingStyle == UITableViewCellEditingStyleInsert) {

        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view

    }

}