关于CoreData的介绍太多，网上一搜大把全是，这里不介绍CoreData，直接上代码，注释写的很详细，应该很容易理解，暂时现做简单的增删该查，后面有时间再做修改完善。
CoreDataManager.h
//
// CoreDataManager.h
// UCaiYuan
//
// Created by wanyakun on 16/1/6.
// Copyright © 2016年 com.ucaiyuan. All rights reserved.
// #import <Foundation/Foundation.h> @interface CoreDataManager : NSObject +(CoreDataManager *)defaultManager; /**
* 插入单条数据到Entity
*
* @param entity 实体字典
* @param name Entity名称
*/
- (BOOL)insertCoreDataWithEntity:(NSDictionary *)entity name:(NSString *)name; /**
* 根据查询条件从实体中查询数据
*
* @param entityName Entity名称
* @param predicate 查询条件
*
* @return 字典数组
*/
- (NSMutableArray *)selectCoreDataFromName:(NSString *)name predicate:(NSString *)predicate; /**
* 更新单条数据到Entity
*
* @param entity 更新内容
* @param name Entity名字
* @param predicate 更新条件
*
* @return 是否更新成功
*/
- (BOOL)updateCoreDataWithEntity:(NSDictionary *)entity name:(NSString *)name predicate:(NSString *)predicate; /**
* 从Entity中删除数据
*
* @param entity 更新内容
* @param name Entity名字
* @param predicate 更新条件
*
* @return 是否删除成功
*/
- (BOOL)deleteCoreDataWithName:(NSString *)name predicate:(NSString *)predicate; @end
CoreDataManager.m
//
// CoreDataManager.m
// UCaiYuan
//
// Created by wanyakun on 16/1/6.
// Copyright © 2016年 com.ucaiyuan. All rights reserved.
// #import "CoreDataManager.h" @interface CoreDataManager ()
/**
* 负责应用和数据直接的交互CRUD
*/
@property (strong, nonatomic) NSManagedObjectContext *managedObjectContext;
/**
* 添加持久化存储库（比如SQLite数据库）
*/
@property (strong, nonatomic) NSPersistentStoreCoordinator *persistentStoreCoordinator;
/**
* 代表CoreData模型文件
*/
@property (strong, nonatomic) NSManagedObjectModel *managedObjectModel;
@end @implementation CoreDataManager #pragma mark - 单例
+(CoreDataManager *)defaultManager {
static dispatch_once_t predicate;
static CoreDataManager * defaultManager;
dispatch_once(&predicate, ^{
defaultManager=[[CoreDataManager alloc] init];
});
return defaultManager;
} #pragma mark - public method
/**
* 插入单条数据到Entity
*
* @param entity 实体字典
* @param name Entity名称
*/
- (BOOL)insertCoreDataWithEntity:(NSDictionary *)entity name:(NSString *)name
{
NSManagedObject *object = [NSEntityDescription insertNewObjectForEntityForName:name inManagedObjectContext:self.managedObjectContext];
[object setValuesForKeysWithDictionary:entity];
// 利用上下文对象，将数据同步到持久化存储库
NSError *error = nil;
BOOL success = [self.managedObjectContext save:&error];
if (!success) {
NSLog(@"保存数据到数据库错误：%@",[error localizedDescription]);
return NO;
}
return YES;
} /**
* 根据查询条件从实体中查询数据
*
* @param entityName Entity名称
* @param predicate 查询条件
*
* @return 字典数组
*/
- (NSMutableArray *)selectCoreDataFromName:(NSString *)name predicate:(NSString *)predicate
{
NSFetchRequest *request = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:name inManagedObjectContext:self.managedObjectContext];
request.entity = entity; if (predicate) {
NSPredicate *predicateObject = [NSPredicate predicateWithFormat:predicate];
request.predicate = predicateObject;
} NSError *error;
NSArray *fetchedObjects = [self.managedObjectContext executeFetchRequest:request error:&error];
NSMutableArray *resultArray = [NSMutableArray array]; for (NSManagedObject *object in fetchedObjects) {
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
for (NSPropertyDescription *property in entity.properties) {
NSString *key = property.name;
id value = [object valueForKey:key];
[dict setValue:value forKey:key];
}
[resultArray addObject:dict];
}
return resultArray;
} /**
* 更新单条数据到Entity
*
* @param entity 更新内容
* @param name Entity名字
* @param predicate 更新条件
*
* @return 是否更新成功
*/
- (BOOL)updateCoreDataWithEntity:(NSDictionary *)entity name:(NSString *)name predicate:(NSString *)predicate
{
NSFetchRequest *request = [[NSFetchRequest alloc] init]; NSEntityDescription *entityDescription = [NSEntityDescription entityForName:name inManagedObjectContext:self.managedObjectContext];
request.entity = entityDescription; if (predicate) {
NSPredicate *predicateObject = [NSPredicate predicateWithFormat:predicate];
request.predicate = predicateObject;
} NSError *error;
NSArray *fetchedObjects = [self.managedObjectContext executeFetchRequest:request error:&error]; for (NSManagedObject *object in fetchedObjects) {
[object setValuesForKeysWithDictionary:entity];
} BOOL success = [self.managedObjectContext save:&error];
if (!success) {
NSLog(@"更新数据到数据库错误：%@",[error localizedDescription]);
return NO;
}
return YES;
} /**
* 从Entity中删除数据
*
* @param entity 更新内容
* @param name Entity名字
* @param predicate 更新条件
*
* @return 是否删除成功
*/
- (BOOL)deleteCoreDataWithName:(NSString *)name predicate:(NSString *)predicate
{
NSFetchRequest *request = [[NSFetchRequest alloc] init]; NSEntityDescription *entityDescription = [NSEntityDescription entityForName:name inManagedObjectContext:self.managedObjectContext];
request.entity = entityDescription; if (predicate) {
NSPredicate *predicateObject = [NSPredicate predicateWithFormat:predicate];
request.predicate = predicateObject;
} NSError *error;
NSArray *fetchedObjects = [self.managedObjectContext executeFetchRequest:request error:&error]; for (NSManagedObject *object in fetchedObjects) {
[self.managedObjectContext deleteObject:object];
} BOOL success = [self.managedObjectContext save:&error];
if (!success) {
NSLog(@"删除数据出错：error:%@",error);
return NO;
}
return YES;
} #pragma mark - private method
//获取Documents路径
- (NSURL *)applicationDocumentsDirectory
{
return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject];
} - (NSString *)bundleName
{
return [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleName"];
} #pragma mark - getter setter
- (NSManagedObjectContext *)managedObjectContext
{
if (_managedObjectContext == nil) {
_managedObjectContext = [[NSManagedObjectContext alloc] init];
_managedObjectContext.persistentStoreCoordinator = [self persistentStoreCoordinator];
}
return _managedObjectContext;
} - (NSPersistentStoreCoordinator *)persistentStoreCoordinator
{
if (_persistentStoreCoordinator == nil) {
_persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:self.managedObjectModel]; NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:[self bundleName]];
NSError *error = nil;
if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error]) {
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
abort();
}
}
return _persistentStoreCoordinator;
} - (NSManagedObjectModel *)managedObjectModel
{
if (_managedObjectModel == nil) {
_managedObjectModel = [NSManagedObjectModel mergedModelFromBundles:nil];
}
return _managedObjectModel;
} @end