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我有兩個實體員工和公司。 如何從兩個實體獲取數據並在表格視圖中顯示核心數據(Swift)
我在兩個實體中都插入了數據。使用以下梅索德:
func addEmployees() {
let companyEntity = NSEntityDescription.entityForName("Company", inManagedObjectContext: managedContext)
let company = Company(entity: companyEntity!, insertIntoManagedObjectContext: managedContext)
company.name = txtCompany.text
let employeesEntity = NSEntityDescription.entityForName("Employees", inManagedObjectContext: managedContext)
let employees = Employees(entity: employeesEntity!, insertIntoManagedObjectContext: managedContext)
employees.name = txtName.text
employees.empAge = Int(txtAge.text!)
employees.address = txtAddress.text
// employees.company = company
company.mutableSetValueForKey(EntityName().employee).addObject(employees)
do {
try managedContext.save()
} catch {
fatalError("Error in saving Data...")
}
}
,並使用該梅索德檢索的數據:
func fetchCompanyName() {
let request = NSFetchRequest(entityName: EntityName().company)
if managedContext.countForFetchRequest(request, error: nil) > 0 {
do {
let fetchResult = try managedContext.executeFetchRequest(request)
company = fetchResult as! [Company]
} catch {
fatalError("Error in fetching company")
}
}
}
我想表明在節頭和細胞的員工名單的公司名稱。部分的編號將等於公司名稱。我不知道該怎麼做?
感謝您的幫助
你熟悉'NSFetchedResultsController'及其委託方法嗎?如果你實現了一個,你可以在實體Employees中設置它的'sectionNameKeyPath'值爲一個新屬性的值(例如'sectionIdentifier'),當你添加新對象時,你設置爲'company.name'。 – andrewbuilder