JustCoreData 5.0.0

JustCoreData 5.0.0

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由 Xiaoye__220 维护。

JustCoreData 5.0.0

pod iOS lisence swift

CocoaPods

使用

use_frameworks!
pod 'JustCoreData'

1.数据模型

先看例子中的 Data Model

例子中的数据模型

Data model in the example

DataModel

2.ManagedObjectType

实体需要实现 ManagedObjectType 协议，该协议实现了根据实体名和默认 NSSortDescriptor，并提供了根据 Dictionary 给实体赋值的功能。

Entities should implement ManagedObjectType protocol.

extension Father: ManagedObjectType {
    public static var entityName: String {
        return "Father"
    }
    
    public static var defaultSortDescriptors: [NSSortDescriptor] {
        return []
    }
}

3.使用

3.1 数据源

自定义 dict 用来存储需要进行操作的数据。

dicts 是需要保存的数据

var dicts: [[String: Any]] {
        var dicts: [[String: Any]] = []
        for i in 1 ... 10 {
            let dict =  ["id": i,
                         "name": "Li lei",
                         "age": 25,
                         "children": [["id": 2*i-1, "name": "Ding ding", "age": 1],
                                      ["id": 2*i, "name": "La la", "age": 2]],
                         "parent": ["id": i,
                                    "name": "Li gang",
                                    "age": 50]] as [String : Any]
            dicts.append(dict)
        }
        return dicts
    }

3.2 初始化

dataModelName 是 .xcdatamodeld 文件的名称

let cd = CoreData<Father>()

CoreDataStack.dataModelName = "Person"

3.3 保存

cd.concurrencyType(.mainSync)
    .saveDataCount(10)
    .configure { (index, person) in
        person.updateFromDictionary(dict: self.dicts[index])
    }
    .completion { (success, _) in
        print("\(Thread.current)\nsync save \(success ? "success" : "fail")")
    }
    .save()

person.updateFromDictionary(dict: self.dicts[index]) 可以通过字典更新实体。如果实体之间存在关联关系，也可以实现关联关系。当然，您也可以根据自己的方式更新实体。

3.4 获取

cd.concurrencyType(.mainSync)
    .fetchRequest { request in
        request.predicate(NSPredicate(format: "name = %@", "Li lei"))
        	.fetchLimit(1)
        	.resultType(.managedObjectResultType)
        // ......
    }
    .completion { (success, results) in
        print("\(Thread.current)\nsync find \(success ? "success" : "fail")")
        let persons = results as! [Father]
        print("result count: \(persons.count)")
    }
    .fetch()

3.5 更新

cd.concurrencyType(.mainSync)
    .fetchRequest { request in
        request.predicate(NSPredicate(format: "name = %@", "1.Li lei"))
    }
    .configure { (index, person) in
        person.name = "Bob"
    }
    .completion { (success, _) in
        print("\(Thread.current)\nsync update \(success ? "success" : "fail")")
    }

3.6 删除

cd.concurrencyType(.mainSync)
    .fetchRequest { _ in }
    .completion { (success, _) in
        print("\(Thread.current)\nsync delete \(success ? "success" : "fail")")
    }
    .delete()

4.NSFetchedResultsController

FetchedResultsManager 封装了 NSFetchedResultsController 的逻辑，使 NSFetchedResultsController 更易于使用

使用方法

class NSFetchedResultsViewController: UITableViewController {

    var fetchedResultsManager: FetchedResultsManager<Father>!
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // init FetchedResultsManager
        fetchedResultsManager = FetchedResultsManager<Father>(contextType: .private,
                                                              tableView: tableView,
                                                              sectionName: nil,
                                                              cacheName: nil,
                                                              fetchRequestConfigure: nil)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    // MARK: - Table view data source
    override func numberOfSections(in tableView: UITableView) -> Int {
        return fetchedResultsManager.numberOfSections()
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return fetchedResultsManager.numberOfItemsInSection(section)
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        var cell = tableView.dequeueReusableCell(withIdentifier: "cell")
        if cell == nil {
            cell = UITableViewCell.init(style: .default, reuseIdentifier: "cell")
        }
        let obj = fetchedResultsManager.objectAtIndexPath(indexPath)
        cell?.textLabel?.text = "id: " + String(obj.id) + "  name: " + obj.name!
        return cell!
    }
    
}