asyncCoreDataWrapper

从此又能和CoreData愉快地玩耍啦（Easy way to play with CoreData）

First, prepare CoreData environment:

1. import CoreData Framework

2. add xdatamodeld file and design your model and generate sub class file

generate sub class in Editor > Create NSManagedContext SubClass

3. copy files to your project

4. init instance in appDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    [[mmDAO instance] setupEnvModel:@"asyncCoreDataWrapper" DbFile:@"asyncCoreDataWrapper.sqlite"];
    return YES;
}


- (void)applicationWillTerminate:(UIApplication *)application
{
    // Saves changes in the application's managed object context before the application terminates.
    [self saveContext];
}

- (void)saveContext
{
    NSError *error = nil;
    if ([[mmDAO instance].bgObjectContext hasChanges]) {
        [[mmDAO instance].bgObjectContext save:&error];
    }
}

5. import catalog class in Prefix.pch file than you can use it anywhere

#import <Availability.h>

#ifndef __IPHONE_3_0
#warning "This project uses features only available in iOS SDK 3.0 and later."
#endif

#ifdef __OBJC__
    #import <UIKit/UIKit.h>
    #import <Foundation/Foundation.h>
    #import <CoreData/CoreData.h>
    #import "NSManagedObject+helper.h"
#endif

How to use

Create new object

Entity *task = [Entity createNew];
task.task_id = @([self genId]);
task.title = _txInputBox.text;
task.detail = @"[not sure]";
task.done = NO;

Delete object

Entity *task = _dataArray[indexPath.row];
[Entity delobject:task];

Save Changes

[Entity save:^(NSError *error) {
    _txInputBox.text = @"";
    [self fetchEntitys];
}];

Fetch Data Array

sync way:

NSArray *results = [Entity filter:@"task_id>10" orderby:@[@"task_id"] offset:0 limit:0];

async way:

[Entity filter:nil orderby:@[@"task_id"] offset:0 limit:0 on:^(NSArray *result, NSError *error) {
    _dataArray = result;
    [_mainTable reloadData]; //reload table view
}];

Do complex operation asynchronously

[Entity async:^id(NSManagedObjectContext *ctx, NSString *className) {
        NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:className];
        [request setSortDescriptors:@[[NSSortDescriptor sortDescriptorWithKey:@"task_id" ascending:YES]]];
        NSError *error;
        NSArray *dataArray = [ctx executeFetchRequest:request error:&error];
        if (error) {
            return error;
        }else{
            return dataArray;
        }

    } result:^(NSArray *result, NSError *error) {
        _dataArray = result;
        [_mainTable reloadData];
    }];

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asynccoredatawrapper's Introduction

asyncCoreDataWrapper

从此又能和CoreData愉快地玩耍啦（Easy way to play with CoreData）

First, prepare CoreData environment:

1. import CoreData Framework

2. add xdatamodeld file and design your model and generate sub class file

3. copy files to your project

4. init instance in appDelegate

5. import catalog class in Prefix.pch file than you can use it anywhere

How to use

Create new object

Delete object

Save Changes

Fetch Data Array

sync way:

async way:

Do complex operation asynchronously

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