Swift中调用中的额外参数'predicate‘

let predicate = NSPredicate(format: "条件")

// 等于
let predicate = NSPredicate(format: "属性 == %@", value)
// 包含
let predicate = NSPredicate(format: "属性 CONTAINS %@", value)
// 大于
let predicate = NSPredicate(format: "属性 > %@", value)
// AND运算符
let predicate = NSPredicate(format: "属性1 == %@ AND 属性2 == %@", value1, value2)

// Core Data示例
let fetchRequest = NSFetchRequest<Entity>(entityName: "Entity")
fetchRequest.predicate = predicate
let results = try managedObjectContext.fetch(fetchRequest)

// CloudKit示例
let query = CKQuery(recordType: "RecordType", predicate: predicate)
let operation = CKQueryOperation(query: query)
operation.recordFetchedBlock = { record in
    // 处理匹配的记录
}