Swift 使用方法预填充核心数据
我为我的核心数据子类创建了一个扩展,在这里我实现了一个预填充表的方法,首先我检查表中是否有任何内容,然后插入一些值,但在执行提取时出现错误: 由于未捕获的异常“NSInvalidArgumentException”而终止应用程序,原因:Swift 使用方法预填充核心数据,swift,core-data,Swift,Core Data,我为我的核心数据子类创建了一个扩展,在这里我实现了一个预填充表的方法,首先我检查表中是否有任何内容,然后插入一些值,但在执行提取时出现错误: 由于未捕获的异常“NSInvalidArgumentException”而终止应用程序,原因:“executeFetchRequest:错误:不是有效的NSFetchRequest”。 import Foundation import CoreData extension SimulationParams { public static fun
“executeFetchRequest:错误:不是有效的NSFetchRequest”。
import Foundation
import CoreData
extension SimulationParams {
public static func feedSimulationParams(context: NSManagedObjectContext) {
let fetchRequest : NSFetchRequest<NSFetchRequestResult>
if #available(iOS 10.0, *) {
fetchRequest = SimulationParams.fetchRequest()
} else {
fetchRequest = NSFetchRequest(entityName: "SimulationParams")
}
let idDescriptor: NSSortDescriptor = NSSortDescriptor(key: "id", ascending: false)
fetchRequest.sortDescriptors = [idDescriptor]
fetchRequest.fetchLimit = 1
var newId = 0;
do {
let results = try context.fetch(fetchRequest)
if(results.count == 0){
self.setValue(getId(fetchRequest: fetchRequest, context: context), forKeyPath: "id")
self.setValue(1.5, forKeyPath: "bankFeePercentage")
self.setValue(1, forKeyPath: "consoMaxMonthly")
self.setValue(12, forKeyPath: "consoMinMonthly")
self.setValue(3.5, forKeyPath: "consoRatePercentage")
self.setValue(4, forKeyPath: "fileFeePercentage")
self.setValue(1, forKeyPath: "immoMaxMonthly")
self.setValue(25, forKeyPath: "immoMinMonthly")
self.setValue(2.05, forKeyPath: "immoRatePercentage")
self.setValue(3, forKeyPath: "prepaymentPenaltyPercentage")
self.setValue(1, forKeyPath: "notaryGridId")
do {
try context.save()
} catch let error as NSError {
print ("Error first demande insertion \(error)")
}
}
} catch {
let fetchError = error as NSError
print(fetchError)
}
}
}
<代码>导入基础
导入CoreData
扩展模拟参数{
公共静态func feedSimulationParams(上下文:NSManagedObjectContext){
let fetchRequest:NSFetchRequest
如果可用(iOS 10.0,*){
fetchRequest=SimulationParams.fetchRequest()
}否则{
fetchRequest=NSFetchRequest(entityName:“SimulationParams”)
}
让idDescriptor:NSSortDescriptor=NSSortDescriptor(键:“id”,升序:false)
fetchRequest.sortDescriptors=[idDescriptor]
fetchRequest.fetchLimit=1
var-newId=0;
做{
let results=try context.fetch(fetchRequest)
如果(results.count==0){
setValue(getId(fetchRequest:fetchRequest,context:context),forKeyPath:“id”)
self.setValue(1.5,forKeyPath:“bankFeePercentage”)
self.setValue(1,forKeyPath:“conomaxmonthly”)
self.setValue(12,forKeyPath:“consminmonthly”)
self.setValue(3.5,forKeyPath:“联合百分比”)
self.setValue(4,forKeyPath:“fileFeePercentage”)
self.setValue(1,forKeyPath:“immoMaxMonthly”)
self.setValue(25,forKeyPath:“每月固定”)
self.setValue(2.05,forKeyPath:“固定百分比”)
self.setValue(3,forKeyPath:“预付款罚款类型扣款”)
self.setValue(1,forKeyPath:“notaryGridId”)
做{
尝试context.save()
}将let错误捕获为NSError{
打印(“错误第一需求方插入\(错误)”)
}
}
}抓住{
让fetchError=错误为NSError
打印(获取错误)
}
}
}
解决方案:
警告,您必须删除数据模型检查器中的模块,并将其设置为全局命名空间
您必须在代码上执行此操作:
let fetchRequest : NSFetchRequest<NSFetchRequestResult>
if #available(iOS 10.0, *) {
fetchRequest = Params.fetchRequest()
} else {
fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Params")
}
//let predicate = NSPredicate(format: "key=%@", key)
//fetchRequest.predicate = predicate
do {
let results = try context.fetch(fetchRequest)
if(results.count != 0){
let params = NSEntityDescription.insertNewObject(forEntityName: "Params", into: context) as! Params
params.setValue(value, forKey: "value")
do {
try context.save()
} catch let error as NSError {
print ("Error first demande insertion \(error)")
}
} else if (results.count == 0) {
let params = NSEntityDescription.insertNewObject(forEntityName: "Params", into: context) as! Params
params.key = key
params.value = value
context.insert(params)
}
} catch {
let fetchError = error as NSError
print(fetchError)
}
let fetchRequest:NSFetchRequest
如果可用(iOS 10.0,*){
fetchRequest=Params.fetchRequest()
}否则{
fetchRequest=NSFetchRequest(entityName:“Params”)
}
//let谓词=NSPredicate(格式:“key=%@”,key)
//fetchRequest.predicate=谓词
做{
let results=try context.fetch(fetchRequest)
如果(results.count!=0){
让params=NSEntityDescription.insertNewObject(forEntityName:“params”,into:context)作为!params
参数setValue(值,forKey:“值”)
做{
尝试context.save()
}将let错误捕获为NSError{
打印(“错误第一需求方插入\(错误)”)
}
}else if(results.count==0){
让params=NSEntityDescription.insertNewObject(forEntityName:“params”,into:context)作为!params
params.key=key
参数值=值
context.insert(参数)
}
}抓住{
让fetchError=错误为NSError
打印(获取错误)
}
解决方案:
警告,您必须删除数据模型检查器中的模块,并将其设置为全局命名空间
您必须在代码上执行此操作:
let fetchRequest : NSFetchRequest<NSFetchRequestResult>
if #available(iOS 10.0, *) {
fetchRequest = Params.fetchRequest()
} else {
fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Params")
}
//let predicate = NSPredicate(format: "key=%@", key)
//fetchRequest.predicate = predicate
do {
let results = try context.fetch(fetchRequest)
if(results.count != 0){
let params = NSEntityDescription.insertNewObject(forEntityName: "Params", into: context) as! Params
params.setValue(value, forKey: "value")
do {
try context.save()
} catch let error as NSError {
print ("Error first demande insertion \(error)")
}
} else if (results.count == 0) {
let params = NSEntityDescription.insertNewObject(forEntityName: "Params", into: context) as! Params
params.key = key
params.value = value
context.insert(params)
}
} catch {
let fetchError = error as NSError
print(fetchError)
}
let fetchRequest:NSFetchRequest
如果可用(iOS 10.0,*){
fetchRequest=Params.fetchRequest()
}否则{
fetchRequest=NSFetchRequest(entityName:“Params”)
}
//let谓词=NSPredicate(格式:“key=%@”,key)
//fetchRequest.predicate=谓词
做{
let results=try context.fetch(fetchRequest)
如果(results.count!=0){
让params=NSEntityDescription.insertNewObject(forEntityName:“params”,into:context)作为!params
参数setValue(值,forKey:“值”)
做{
尝试context.save()
}将let错误捕获为NSError{
打印(“错误第一需求方插入\(错误)”)
}
}else if(results.count==0){
让params=NSEntityDescription.insertNewObject(forEntityName:“params”,into:context)作为!params
params.key=key
参数值=值
context.insert(参数)
}
}抓住{
让fetchError=错误为NSError
打印(获取错误)
}
不相关,但为什么不self.bankfeeepercentage=1.5
?你知道forKeyPath的真正用途吗?@vadian我无法通过self访问属性。forKeyPath,它是关于数据库的,不相关,但为什么不self.bankFeePercentage=1.5
?你知道forKeyPath的真正用途吗?@vadian我无法通过self访问属性。forKeyPath是关于数据库的