HardCoreData：UI线程非阻塞CoreData栈和控制器

Core Data , HardCoreData

HardCoreData是基于Marcus Zarra 的多线程方法创建的 Core Data 栈，能够将写入到私有队列解耦，保持UI操作的流畅性。

HardCoreData由两个基本元素组成： HCDCoreDataStack 和 HCDCoreDataStackController。

HCDCoreDataStack

封装本地 CoreData 栈设置

/* Convenience initializers */

+ (instancetype)binaryStackWithName:(NSString *)modelName;
+ (instancetype)inMemoryStackWithName:(NSString *)modelName;
+ (instancetype)sqliteStackWithName:(NSString *)modelName;
+ (instancetype)stackWithModelName:(NSString *)modelName storeType:(NSString *)storeType;

/**
 *  Designated initializer
 *
 *  @param modelName NSString
 *  @param storeType NSString
 *
 *  @return HCDCoreDataStack
 */

- (instancetype)initWithModelName:(NSString *)modelName storeType:(NSString *)storeType NS_DESIGNATED_INITIALIZER;

/* Convenience initializers */

+ (instancetype)binaryStackWithName:(NSString *)modelName;

+ (instancetype)inMemoryStackWithName:(NSString *)modelName;

+ (instancetype)sqliteStackWithName:(NSString *)modelName;

+ (instancetype)stackWithModelName:(NSString *)modelName storeType:(NSString *)storeType;

/**

* Designated initializer

* @param modelName NSString

* @param storeType NSString

* @return HCDCoreDataStack

- (instancetype)initWithModelName:(NSString *)modelName storeType:(NSString *)storeType NS_DESIGNATED_INITIALIZER;

HCDCoreDataStack protocol

因为 HCDCoreDataStack 不仅是一个类，还是一个协议，所以你可以通过实现协议来创建自定义的栈。

@protocol HCDCoreDataStack <NSObject>

@required

/* Represents current store coordinator */
@property (nonatomic, strong, readonly) NSPersistentStoreCoordinator *persistentStoreCoordinator;

/* Represents currentm object model */
@property (nonatomic, strong, readonly) NSManagedObjectModel *managedObjectModel;

/* Represents your single source of truth. Associated with main queue. */
@property (nonatomic, strong, readonly) NSManagedObjectContext *mainManagedObjectContext;

@end

@protocol HCDCoreDataStack <NSObject>

@required

/* Represents current store coordinator */

@property (nonatomic, strong, readonly) NSPersistentStoreCoordinator *persistentStoreCoordinator;

/* Represents currentm object model */

@property (nonatomic, strong, readonly) NSManagedObjectModel *managedObjectModel;

/* Represents your single source of truth. Associated with main queue. */

@property (nonatomic, strong, readonly) NSManagedObjectContext *mainManagedObjectContext;

@end

HCDCoreDataStackController

创建子上下文与保存操作。

/**
 *  Designated initializer
 *
 *  @param stack HCDCoreDataStack
 *
 *  @return HCDCoreDataStackController
 */
- (instancetype)initWithStack:(id <HCDCoreDataStack>)stack NS_DESIGNATED_INITIALIZER;

/**
 * Instantiates new child context with given concurrency type.（使用给定的并发类型实例化新的子上下文）
 * You are responsive for retaining.
 */
- (NSManagedObjectContext *)createChildContextWithType:(NSManagedObjectContextConcurrencyType)type;

/**
 *  保存主上下文（main context），并将更改（changes）推送到持久化保存。
 *  执行时会保证线程安全
 */
- (void)save;

/**

* Designated initializer

* @param stack HCDCoreDataStack

* @return HCDCoreDataStackController

- (instancetype)initWithStack:(id <HCDCoreDataStack>)stack NS_DESIGNATED_INITIALIZER;

/**

* Instantiates new child context with given concurrency type.（使用给定的并发类型实例化新的子上下文）

* You are responsive for retaining.

- (NSManagedObjectContext *)createChildContextWithType:(NSManagedObjectContextConcurrencyType)type;

/**

* 保存主上下文（main context），并将更改（changes）推送到持久化保存。

* 执行时会保证线程安全

- (void)save;

应用实例

/* Create core data stack */
HCDCoreDataStack *stack = [HCDCoreDataStack sqliteStackWithName:@"Model"];

HCDCoreDataStackController *coreDataController = [HCDCoreDataStackController controllerWithStack:stack];

NSManagedObjectContext *backgroundContext = [coreDataController createChildContextWithType:NSPrivateQueueConcurrencyType];

  [backgroundContext performBlock:^{

    Person *person = [NSEntityDescription insertNewObjectForEntityForName:NSStringFromClass([Person class]) inManagedObjectContext:backgroundContext];

    person.firstName = @"John";

    person.lastName = @"Doe";

    /* 保存子上下文 */   
    [backgroundContext save:nil];

    /* 将数据保存到持久化存储 */   
    [coreDataController save];

}];