对Core Data增删改查的封装，同时提供了Swift版本与Objective-C版本，两个版本的使用方法一致，Demo中提供了增删改查的使用示例。
/// 增
///
/// - Parameters:
/// - name: 实体(Entity)名称
/// - handler: 配置待保存数据回调
/// - rs: 保存结果回调
class func insert(entity name: String, configHandler handler: ((_ obj: NSManagedObject) -> Void), resulteHandler rs: ((_ error: NSError? ) -> Void)? = nil)
这里主要说一下configHandler，其参数为NSManagedObject，为了提高复用性，在封装的方法中没有涉及到具体的entity，该回调方法就是供外部对具体entity进行赋值的入口，使用示例：
let names = ["夏侯惇", "貂蝉", "诸葛亮", "张三", "李四", "流火绯瞳", "流火", "李白", "张飞", "韩信", "范冰冰", "赵丽颖"]
for i in 0...60 {
LQCoreData.insert(entity: "PeopleEntity", configHandler: { (obj) in
// 将回调的obj转换为具体的实体进行赋值
let people = obj as! PeopleEntity
people.name = names[i%names.count]
people.age = Int16(arc4random() % 80 + UInt32(10))
}, resulteHandler: { (error) in
if let err = error {
print("保存失败\(err)")
} else {
print("保存成功")
}
})
}
提供了两种删除方法，单独删除和批量删除：
/// 删
///
/// - Parameters:
/// - name: 实体(Entity)名称
/// - predicate: 删除条件
/// - result: 删除结果回调
class func delete(entity name: String, predicate: NSPredicate? = nil, resultHandler rs: ((_ error: NSError?, _ deletedObjs: Array<Any>?) -> Void)? = nil)
/// 批量删除操作
///
/// - Parameters:
/// - name: 实体(Entity)名称
/// - predicate: 查找条件
/// - handle: 结果回调
class func batchDelete(entity name: String, predicate: NSPredicate, resultHandler handler: ((_ error: NSError?) -> Void)? = nil)
使用示例，删除年龄为30的：
let pre1 = LQCoreData.predicate(.equalTo(number: 30, forProperty: "age"))
LQCoreData.delete(entity: "PeopleEntity", predicate: pre1) { (error, info) in
if let err = error {
print("err: \(err)")
} else {
print("所有年龄为30的已删除")
}
}
更新数据也是提供了两种方法，单个更新和批量更新：
/// 改
///
/// - Parameters:
/// - name: 实体(Entity)名称
/// - predicate: 查询条件
/// - handler: 更新数据的回调
/// - result: 更新结果的回调
class func update(withEntityName name: String, predicate: NSPredicate, configNewValues handler: ((_ objs: Array<Any>) -> Void), result: ((_ error: NSError?) -> Void)? = nil)
/// 批量更新
///
/// - Parameters:
/// - name: 实体(Entity)名称
/// - predicate: 查询条件
/// - values: 更新的值, 字典; key: 待更新属性名称, value: 更新的值
/// - handle: 更新结果回调
class func batchUpdate(entity name: String, predicate: NSPredicate, propertiesToUpdate values: Dictionary<String, Any>, resultHandler handler: ((_ error: NSError?) -> Void)? = nil)
例如，将所有的范冰冰，名称更新为哈哈哈：
let pre2 = LQCoreData.predicate(.match(string: "范冰冰", forProperty: "name"))
LQCoreData.update(withEntityName: "PeopleEntity", predicate: pre2, configNewValues: { (datas) in
for data in datas {
let people = data as! PeopleEntity
people.name = "哈哈哈哈"
people.age = 100
}
}) { (error) in
if let err = error {
print("err: \(err)")
} else {
print("已更新")
}
}
/// 查
///
/// - Parameters:
/// - name: 实体(Entity)名称
/// - predicate: 查询条件-谓词
/// - propertiesToFetch: 查询的属性, 默认所有属性
/// - key: 查询结果排序的依据属性, 升序
/// - result: 查询结果回调
class func fetch(entity name: String, predicate: NSPredicate? = nil, propertiesToFetch: Array<Any>? = nil, resultSortKey key: String? = nil, resultHandler rs: @escaping ((_ info: Array<Any>?) -> Void))
例如，查找年龄小于50的：
let pre = LQCoreData.predicate(.smallThan(number: 50, forProperty: "age"))
LQCoreData.fetch(entity: "PeopleEntity", predicate: pre) { (results) in
print("**************************查询age小于50*******************************")
if let rs = results {
for info in rs {
let people = info as! PeopleEntity
print("name: \(people.name ?? " ") ----age: \(people.age)")
}
} else {
print("查询失败")
}
}
另外单独封装了几个常用的条件谓词，可以直接调用相应的方法即可：
// MARK: - 预设的谓词查询条件 NSPredicate
enum LQPredicateType {
case like(string: String, forProperty: String)
case match(string: String, forProperty: String)
case matchc(string: String, forProperty: String)
case contain(string: String, forProperty: String)
case equalTo(number: Int64, forProperty: String)
case bigThan(number: Int64, forProperty: String)
case smallThan(number: Int64, forProperty: String)
case notBigThan(number: Int64, forProperty: String)
case notSmallThan(number: Int64, forProperty: String)
}
以及一个, 在新版Xcode中使用的注意事项: