iOS.数据持久化.PersistenceLayer.属性列表

#import <Foundation/Foundation.h>
#import "Persistence01Note.h"

@interface Persistence01NoteDAO : NSObject

#pragma mark 单例
+(Persistence01NoteDAO *)sharedManager;

#pragma mark NotesList.plist文件路径
-(NSString *)applicationDocumentsDirectoryFile;

#pragma mark 创建NotesList.plist文件
-(void)createEditableCopyOfDatabaseIfNeeded;

#pragma mark 操作NotesList.plist文件

-(int)create:(Persistence01Note *)model;

-(int)remove:(Persistence01Note *)model;

-(int)modify:(Persistence01Note *)model;

-(NSMutableArray *)findAll;

-(Persistence01Note *)findById:(Persistence01Note *)model;

@end

#import "Persistence01NoteDAO.h"

@implementation Persistence01NoteDAO

static Persistence01NoteDAO *sharedManager = nil;
+(Persistence01NoteDAO *)sharedManager
{
    static dispatch_once_t once;
    dispatch_once(&once, ^{
        
        sharedManager = [[self alloc] init];
        [sharedManager createEditableCopyOfDatabaseIfNeeded];
    });
    return sharedManager;
}

-(NSString *)applicationDocumentsDirectoryFile
{
    NSString *documentDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    NSString *path = [documentDirectory stringByAppendingPathComponent:@"NotesList.plist"];
    return path;
}

-(void)createEditableCopyOfDatabaseIfNeeded
{
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSString *writableDBPath = [self applicationDocumentsDirectoryFile];
    
    BOOL dbexists = [fileManager fileExistsAtPath:writableDBPath];
    if (!dbexists) {
        NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"NotesList.plist"];
        
        NSError *error;
        BOOL success = [fileManager copyItemAtPath:defaultDBPath toPath:writableDBPath error:&error];
        if (!success) {
            NSAssert(0, @"错误写入文件：'%@'。",[error localizedDescription]);
        }
    }
}

-(int)create:(Persistence01Note *)model
{
    NSString *path = [self applicationDocumentsDirectoryFile];
    NSMutableArray *array = [[NSMutableArray alloc] initWithContentsOfFile:path];
    
    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    [dateFormat setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    
    NSDictionary *dict = [NSDictionary dictionaryWithObjects:@[[dateFormat stringFromDate:model.date],model.content] forKeys:@[@"date",@"content"]];
    
    [array addObject:dict];
    
    [array writeToFile:path atomically:YES];
    
    return 1;
}

-(int)remove:(Persistence01Note *)model
{
    
    NSString *path= [self applicationDocumentsDirectoryFile];
    NSMutableArray *array = [[NSMutableArray alloc] initWithContentsOfFile:path];
    
    for (NSDictionary *dict in array) {
        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
        
        NSDate *date = [dateFormatter dateFromString:[dict objectForKey:@"date"]];
        
        // 比较日期主键是否相等
        if ([date isEqualToDate:model.date]) {
            [array removeObject:dict];
            [array writeToFile:path atomically:YES];
            break;
        }
    }
    
    return 1;
}

-(int)modify:(Persistence01Note *)model
{
    
    NSString *path = [self applicationDocumentsDirectoryFile];
    NSMutableArray *array = [[NSMutableArray alloc] initWithContentsOfFile:path];
    
    for (NSDictionary *dict in array) {
        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
        
        NSDate *date = [dateFormatter dateFromString:[dict objectForKey:@"date"]];
        NSString *content = [dict objectForKey:@"content"];
        
        // 比较日期主键是否相等
        if ([date isEqualToDate:model.date]) {
            [dict setValue:content forKey:@"content"];
            [array writeToFile:path atomically:YES];
            break;
        }
    }
    
    return 1;
}

-(NSMutableArray *)findAll
{
    
    NSString *path = [self applicationDocumentsDirectoryFile];
    NSMutableArray *listData = [[NSMutableArray alloc] init];
    
    NSMutableArray *array = [[NSMutableArray alloc] initWithContentsOfFile:path];
    
    for (NSDictionary *dict in array) {
        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
        
        Persistence01Note *note = [[Persistence01Note alloc] init];
        note.date = [dateFormatter dateFromString:[dict objectForKey:@"date"]];
        note.content = [dict objectForKey:@"content"];
        
        [listData addObject:note];
    }
    
    return listData;
}

-(Persistence01Note *)findById:(Persistence01Note *)model
{
    NSString *path = [self applicationDocumentsDirectoryFile];
    NSMutableArray *array = [[NSMutableArray alloc] initWithContentsOfFile:path];
    
    for (NSDictionary *dict in array) {
        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
        
        Persistence01Note *note = [[Persistence01Note alloc] init];
        note.date =[dateFormatter dateFromString:[dict objectForKey:@"date"]];
        note.content = [dict objectForKey:@"content"];
        
        if ([note.date isEqualToDate:model.date]) {
            return note;
        }
    }
    return nil;
}

@end