CoreDataDemo

CoreData的封装管理类,以及使用方法

Core Data的封装类,具体的使用方法如下:

我们要在自己的控制器里面调用具体的几个接口, 对数据进行增删改查,

首先要引入模型类和管理类

#import "Person+CoreDataClass.h"
#import "LCCoreDataManager.h"

然后把我们刚才写好的管理类以及模型文件进行初始化

LCCoreDataManager *coreDataManager = [LCCoreDataManager shareInstanceWithStoreName:@"Person"];
Person *personModel = [[Person alloc] initWithEntity:[NSEntityDescription entityForName:@"Person" inManagedObjectContext:coreDataManager.context] insertIntoManagedObjectContext:nil];

接下来就可以进行相应的增删改查操作了, 这些方法需要放在对应的调用方法里面:

/** 
插入数据
*/
- (void)clickInsertBtn
{ 
    LCCorewDataManager *coreDataManager = [LCCoreDataManager shareInstanceWithStoreName:@"Person"];

    Person *personModel = [[Person alloc] initWithEntity:[NSEntityDescription entityForName:@"Person" inManagedObjectContext:coreDataManager.context] insertIntoManagedObjectContext:nil];

    personModel.name = @"kobe";
    personModel.age = 37;
    personModel.height = 198;

    [coreDataManager insertModel:personModel];
}


/** 
删除数据 
*/
- (void)clickDeleteBtn
{
    LCCoreDataManager *coreDataManager = [LCCoreDataManager shareInstanceWithStoreName:@"Person"];

    Person *personModel = [[Person alloc] initWithEntity:[NSEntityDescription entityForName:@"Person" inManagedObjectContext:coreDataManager.context] insertIntoManagedObjectContext:nil];

    //predicateString--需要删除的数据的条件
    [coreDataManager removeModel:personModel predicateString:@"age = 40"];
}

/** 
修改数据 
*/
- (void)clickChangeBtn
{
    LCCoreDataManager *coreDataManager = [LCCoreDataManager shareInstanceWithStoreName:@"Person"];

    Person *personModel = [[Person alloc] initWithEntity:[NSEntityDescription entityForName:@"Person" inManagedObjectContext:coreDataManager.context] insertIntoManagedObjectContext:nil];

    //要修改的数据
    personModel.name = @"jordon";
    personModel.height = 199;
    personModel.age = 40;

    //需要被修改的数据   (所有age = 37的进行修改)
    [coreDataManager changeModel:personModel predicateString:@"age = 37"];

}

/**
查询数据
*/
- (void)clickSearchBtn
{
    LCCoreDataManager *coreDataManager = [LCCoreDataManager shareInstanceWithStoreName:@"Person"];

    Person *personModel = [[Person alloc] initWithEntity:[NSEntityDescription entityForName:@"Person" inManagedObjectContext:coreDataManager.context] insertIntoManagedObjectContext:nil];

    //要查询数据的条件
    NSMutableArray *PersonArr = [coreDataManager findByModel:personModel predicateString:@"age = 37"];

    NSLog(@"%ld", PersonArr.count);

    for (Person *personM in PersonArr) {
    NSLog(@"%@=%d=%d", personM.name,personM.age, personM.height);
    }

}